WO2025218613A1 - Signal sending method and communication apparatus - Google Patents

Abstract

A signal sending method and a communication apparatus. The method comprises: on the basis of a first modulation mode, modulating signals to be modulated, so as to obtain first modulated signals, the first modulation mode comprising amplitude modulation of the signals to be modulated; on the basis of a second modulation mode, modulating the plurality of first modulated signals, so as to obtain m second modulated signals, the second modulation mode comprising phase modulation, and the second modulated signals being complex signals; and sending the second modulated signals. The method and the communication apparatus provided by the embodiments of the present application enable bit information to be carried on modulated signals, so as to achieve information transmission, and also expand the selection of signal modulation modes, so as to allow devices to, on the basis of actual communication situations, choose to use flexible modulation modes for signal modulation, thus improving communication performance.

Description

Signal sending method and communication device

This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on April 18, 2024, with application number 202410473260.4 and invention name “A method and communication device for signal transmission”, the entire contents of which are incorporated by reference into this application.

Technical Field

The embodiments of the present application relate to the field of communications, and more specifically, to a signal sending method and a communication device.

Background Art

In communication systems, information is often represented by bits (0 or 1). However, wireless signals, when observed in the time domain, appear as sinusoidal waves with varying amplitudes. Before a device sends a signal to another device or receives a signal from another device, it must modulate (modulate) or demodulate (de-modulate) the signal so that the desired bit information can be carried on or extracted from the radio signal.

Therefore, how to carry bits on analog signals with amplitude and phase through signal transmission is an urgent problem to be solved.

Summary of the Invention

An embodiment of the present application provides a method for signal transmission, which can carry bits on an analog signal with amplitude and phase.

In the first aspect, a method for signal transmission is provided, which can be executed by a terminal device, or by a communication module configured in the terminal device, or a circuit or chip or chip system in the terminal responsible for the communication function (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip, processor or system in package (SIP) chip containing a modem core), or it can also be executed by a logic module or software that can realize all or part of the terminal device function. The method can also be executed by a network device, or it can also be executed by a component configured in the network device (such as a chip or circuit or chip system). The embodiments of the present application are not limited to this. Here, the application of this method to a terminal device/network device is taken as an example.

The method includes: modulating a to-be-modulated signal according to a first modulation mode to obtain a first modulation signal, wherein the first modulation mode includes modulating the amplitude of the to-be-modulated signal; modulating multiple first modulation signals according to a second modulation mode to obtain m second modulation signals, wherein the second modulation mode includes phase modulation, the second modulation signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulation signals satisfy: the phase difference Q between any two adjacent second modulation signals in the time domain satisfies: Q = n*π/2, or, Q = -n*π/2, where n is an integer greater than or equal to 1; and sending the second modulation signal.

Based on the solution provided in the embodiment of the present application, by performing amplitude modulation and phase modulation on the modulated signal, on the one hand, bit information can be carried on the modulated signal, thereby realizing information transmission; on the other hand, the choice of signal modulation methods is enriched, so that the device can choose to use a flexible modulation method to modulate the signal according to the actual communication situation, thereby improving communication performance.

In some possible implementations, sending the second modulated signal includes: any two adjacent second modulated signals in the time domain have a time interval.

In some possible implementations, the time interval is greater than or equal to T/2, where T is a transmission period of the second modulated signal in the time domain.

Based on the solution provided in the embodiments of the present application, by transmitting any two adjacent second modulation symbols in the time domain with a time interval, and transmitting the peak of the waveform of one of any two adjacent second modulation signals in the time domain, and superimposing the non-peak of the waveform of the other second modulation signal, the peak to average power ratio (PAPR) can be effectively reduced, the link quality can be improved, and thus the communication performance can be improved.

In some possible implementations, modulating multiple first modulation signals according to a second modulation method to obtain m second modulation signals also includes: modulating the amplitude of the first modulation signal according to a first coefficient A, wherein the first coefficient A is related to at least any one of the following: a roll-off factor α, or a spectrum expansion factor β.

Based on the solution provided in the embodiments of the present application, on the one hand, by expanding the number of subcarriers for transmitting modulated signals, the PAPR of signal transmission can be reduced and the link quality can be improved, or, by compressing the number of subcarriers for transmitting modulated signals, the occupancy of frequency resources can be reduced and the spectrum efficiency can be improved; on the other hand, by amplitude modulating the signal according to spectrum expansion/compression, the amplitude of the modulated signal can be made to better match the bandwidth for transmitting the modulated signal, thereby improving the error performance of signal transmission and thus improving communication performance.

In some possible implementations, the first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A=1-β.

In some possible implementations, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol, the second modulated signal and the pilot symbol are located in the same time unit, the pilot symbol includes a frequency domain sequence that has not been processed in the time domain, and the bandwidth for sending the pilot symbol is the same as the bandwidth for sending the second modulated signal.

Exemplarily, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol in the same time unit (for example, the same radio frame), the pilot symbol including a frequency domain pilot signal, such as a Zadoff-Chu sequence (also known as a ZC sequence), or an m-sequence whose modulation signal is a quadrature phase shift keying (QPSK) signal. The second modulated signal includes the above-mentioned single-carrier signal that has undergone bandwidth expansion/compression, and the pilot symbol includes a signal that has not undergone the above-mentioned bandwidth expansion/compression (i.e., the pilot symbol representation signal is directly mapped to the bandwidth after bandwidth expansion/compression after generation, without undergoing discrete Fourier transform (DFT) and bandwidth expansion/compression operations like the second modulated signal, and the expanded/compressed bandwidth is used to transmit the above-mentioned second modulated signal and pilot symbol).

In some possible implementations, the frequency domain sequence includes a constant modulus sequence.

Exemplarily, the frequency domain sequence includes a ZC sequence or an m sequence.

Based on the solution provided in the embodiment of the present application, the signal is amplitude modulated by the first coefficient A, so that the energy of the modulated second modulated signal is more consistent with the energy of the pilot symbol, thereby improving the performance of correct demodulation of the signal, thereby improving communication performance.

In some possible implementations, the phase modulation includes at least any one of the following: modulating the first modulation signal according to a common phase rotation; or modulating the first modulation signal according to a rotation phase value.

In some possible implementations, the second modulated signal satisfies the following conditions:

Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value.

In some possible implementations, the value B of PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

In some possible implementations, Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, where a is a number greater than or equal to 0.

In some possible implementations, f(i) satisfies any of the following: f(i)=ni, or f(i)=-ni, or f(i)=n(i mod 4y+2), or f(i)=-n(i mod 4y+2), or f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function.

The second modulation mode further includes modulating the amplitude of the first modulation signal according to a normalization coefficient, and the normalization coefficient C satisfies: Any of, or Any one of .

In some possible implementations, b(i') represents a signal to be modulated corresponding to the first modulated signal, and i' represents an index of the signal to be modulated;

When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,

When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

Based on the solution provided in the embodiment of the present application, the modulated signal can carry 2 or more bits. The modulated signal carrying more than 2 bits can improve spectrum efficiency.

In some possible implementations, b(i') represents a signal to be modulated corresponding to the first modulated signal, and i' represents an index of the signal to be modulated;

When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,

When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

Based on the solution provided in the embodiment of the present application, the modulated signal can carry 2 or more bits. The modulated signal carrying more than 2 bits can improve spectrum efficiency.

In the second aspect, a method for signal transmission is provided, which can be executed by a terminal device, or by a communication module configured in the terminal device, or a circuit or chip or chip system in the terminal responsible for the communication function (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip, processor or system in package (SIP) chip containing a modem core), or it can be executed by a logic module or software that can realize all or part of the terminal device function. The method can also be executed by a network device, or it can be executed by a component configured in the network device (such as a chip or circuit or chip system). The embodiments of the present application are not limited to this. Here, the application of this method to a terminal device/network device is taken as an example.

The method includes: modulating a to-be-modulated signal according to a first modulation mode to obtain a first modulation signal, the first modulation mode including modulating the phase of the to-be-modulated signal; modulating the first modulation signal according to a second modulation mode to obtain a second modulation signal, the second modulation mode including modulating the amplitude of the first modulation signal according to a first coefficient A, the first coefficient A being related to at least any one of the following: a roll-off factor α, or a spectrum expansion factor β; and sending the second modulation signal.

Based on the solution provided in the embodiments of the present application, on the one hand, by expanding the number of subcarriers for transmitting modulated signals, the PAPR of signal transmission can be reduced and the link quality can be improved, or, by compressing the number of subcarriers for transmitting modulated signals, the occupancy of frequency resources can be reduced and the spectrum efficiency can be improved; on the other hand, by amplitude modulating the signal according to spectrum expansion/compression, the amplitude of the modulated signal can be made to better match the bandwidth for transmitting the modulated signal, thereby improving the error performance of signal transmission and thus improving communication performance.

In some possible implementations, the second modulated signal includes a real signal and an imaginary signal, and sending the second modulated signal includes sending the real signal and the imaginary signal, and the real signal and the imaginary signal have a time interval.

In some possible implementations, the time interval is greater than or equal to T/2, where T is a transmission period of the second modulated signal in the time domain.

Based on the solution provided in the embodiment of the present application, by transmitting the real and imaginary parts of the modulated signal at time intervals, and superimposing the peaks of the waveform of the transmitted real signal with the non-peaks of the waveform of the transmitted imaginary signal, the PAPR can be effectively reduced, the link quality can be improved, and thus the communication performance can be improved.

In some possible implementations, the first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A=1-β.

In some possible implementations, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol, the second modulated signal and the pilot symbol are located in the same time unit, the pilot symbol includes a frequency domain sequence that has not been processed in the time domain, and the bandwidth for sending the pilot symbol is the same as the bandwidth for sending the second modulated signal.

Exemplarily, sending the second modulated signal includes: sending the second modulated signal and pilot symbols in the same time unit (e.g., the same radio frame), the pilot symbols including frequency-domain pilot signals, such as a Zadoff-Chu sequence (also known as a ZC sequence), or an m-sequence in which the modulated signal is a QPSK signal. The second modulated signal includes the above-mentioned single-carrier signal that has undergone bandwidth expansion/compression, and the pilot symbols include signals that have not undergone the above-mentioned bandwidth expansion/compression (i.e., the pilot symbol representation signal is directly mapped to the bandwidth after bandwidth expansion/compression after generation, without undergoing the same DFT and bandwidth expansion/compression operations as the second modulated signal, and the expanded/compressed bandwidth is used to transmit the above-mentioned second modulated signal and pilot symbols).

In some possible implementations, the frequency domain sequence includes a constant modulus sequence.

Exemplarily, the frequency domain sequence includes a ZC sequence or an m sequence.

Based on the solution provided in the embodiment of the present application, the signal is amplitude modulated by the first coefficient A, so that the energy of the modulated second modulated signal is more consistent with the energy of the pilot symbol, thereby improving the performance of correct demodulation of the signal, thereby improving communication performance.

In some possible implementations, the second modulated signal satisfies the following conditions:

Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value.

In some possible implementations, the value B of PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

In some possible implementations, Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, where a is a number greater than or equal to 0.

In some possible implementations, f(i) satisfies: f(i)=0; or,

f(i)＝n(i mod 4y+2), or, f(i)＝-n(i mod 4y+2), or, f(i)＝n(i mod 4y), or,

f(i) = -n(i mod 4y), where y is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and mod represents the remainder function;

The second modulation method further includes modulating the amplitude of the first modulation signal according to a normalization coefficient, and the normalization coefficient C satisfies: Any one of .

In some possible implementations, b(i') represents a signal to be modulated corresponding to the first modulated signal, and i' represents an index of the signal to be modulated;

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=4i, or i'=4i+1, or i'=4i+2, or i'=4i+3, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,

When i' satisfies any of the following: i'=6i, or i'=6i+1, or i'=6i+2, or i'=6i+3, or i'=6i+4, or i'=6i+5, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

Based on the solution provided in the embodiment of the present application, the modulated signal can carry more than 2 bits, which can improve spectrum efficiency.

In some possible implementations, b(i') represents a signal to be modulated corresponding to the first modulated signal, and i' represents an index of the signal to be modulated;

When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
mod represents the remainder function.

On the third aspect, a method for signal reception is provided, which can be executed by a terminal device, or by a communication module configured in the terminal device, or a circuit or chip or chip system in the terminal responsible for the communication function (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip, processor or system in package (SIP) chip containing a modem core), or it can be executed by a logic module or software that can realize all or part of the terminal device function. The method can also be executed by a network device, or it can also be executed by a component configured in the network device (such as a chip or circuit or chip system). The embodiments of the present application are not limited to this. Here, the application of this method to a terminal device/network device is taken as an example.

The method includes: receiving a second modulated signal, and demodulating the second modulated signal according to a first coefficient A.

Based on the solution provided in the embodiment of the present application, the modulated signal is demodulated according to the first coefficient, so that the demodulation result of the signal can be more consistent with the modulated signal before modulation, obtaining a more accurate demodulation result, better recovering the signal, and improving the error performance.

In a fourth aspect, a communication device is provided, which includes: a processing unit, used to modulate a modulated signal according to a first modulation method to obtain a first modulated signal, the first modulation method including modulating the amplitude of the modulated signal; the processing unit is also used to: modulate multiple first modulated signals according to a second modulation method to obtain m second modulated signals, wherein the second modulation method includes phase modulation, the second modulated signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulated signals satisfy: the phase difference Q of any two adjacent second modulated signals in the time domain satisfies: Q = n*π/2, or, Q = -n*π/2, n is an integer greater than or equal to 1; a transceiver unit, used to send the second modulated signal.

In some possible implementations, the second modulated signal includes a real signal and an imaginary signal, and the transceiver unit is specifically configured to: send the second modulated signal including sending the real signal and the imaginary signal, and the real signal and the imaginary signal have a time interval.

In some possible implementations, the time interval is greater than or equal to T/2, where T is a transmission period of the second modulated signal in the time domain.

In some possible implementations, the processing unit is specifically configured to: modulate the amplitude of the first modulation signal according to a first coefficient A, wherein the first coefficient A is at least related to any one of the following: a roll-off factor α, or a spectrum expansion factor β.

In some possible implementations, the first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A=1-β.

In some possible implementations, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol, the second modulated signal and the pilot symbol are located in the same time unit, the pilot symbol includes a frequency domain sequence that has not been processed in the time domain, and the bandwidth for sending the pilot symbol is the same as the bandwidth for sending the second modulated signal.

Exemplarily, sending the second modulated signal includes: sending the second modulated signal and pilot symbols in the same time unit (e.g., the same radio frame), the pilot symbols including frequency-domain pilot signals, such as a Zadoff-Chu sequence (also known as a ZC sequence), or an m-sequence in which the modulated signal is a QPSK signal. The second modulated signal includes the above-mentioned single-carrier signal that has undergone bandwidth expansion/compression, and the pilot symbols include signals that have not undergone the above-mentioned bandwidth expansion/compression (i.e., the pilot symbol representation signal is directly mapped to the bandwidth after bandwidth expansion/compression after generation, without undergoing the same DFT and bandwidth expansion/compression operations as the second modulated signal, and the expanded/compressed bandwidth is used to transmit the above-mentioned second modulated signal and pilot symbols).

In some possible implementations, the frequency domain sequence includes a constant modulus sequence.

Exemplarily, the frequency domain sequence includes a ZC sequence or an m sequence.

Based on the solution provided in the embodiment of the present application, the signal is amplitude modulated by the first coefficient A, so that the energy of the modulated second modulated signal is more consistent with the energy of the pilot symbol, thereby improving the performance of correct demodulation of the signal, thereby improving communication performance.

In some possible implementations, the processing unit is specifically configured to perform any one of the following: modulating the first modulation signal according to a common phase rotation; or modulating the first modulation signal according to a rotation phase value.

In some possible implementations, the second modulated signal satisfies the following conditions:

Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value.

In some possible implementations, the value B of PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

In some possible implementations, Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, where a is a number greater than or equal to 0.

In some possible implementations, f(i) satisfies any of the following: f(i)=ni, or, f(i)=-ni, or,

f(i)＝n(i mod 4y+2), or, f(i)＝-n(i mod 4y+2), or, f(i)＝n(i mod 4y), or,

f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function; the processing unit is specifically configured to modulate the amplitude of the first modulation signal according to a normalization coefficient, wherein the normalization coefficient C satisfies: Any of, or Any one of .

In some possible implementations, b(i') represents a signal to be modulated corresponding to the first modulated signal, and i' represents an index of the signal to be modulated;

When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,

When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

In some possible implementations, b(i') represents the signal to be modulated corresponding to the first modulated signal, and i' represents the index of the signal to be modulated; when i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,

When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

In a fifth aspect, a communication device is provided, which includes: a processing unit, used to modulate a modulated signal according to a first modulation method to obtain a first modulated signal, the first modulation method including modulating the phase of the modulated signal; the processing unit is also used to: modulate the first modulated signal according to a second modulation method to obtain a second modulated signal, the second modulation method including modulating the amplitude of the first modulated signal according to a first coefficient A, the first coefficient A is at least related to any one of the following: a roll-off factor α, or a spectrum expansion factor β; a transceiver unit, used to send the second modulated signal.

In some possible implementations, the second modulated signal includes a real signal and an imaginary signal, and the transceiver unit is specifically configured to send the real signal and the imaginary signal, and the real signal and the imaginary signal have a time interval.

In some possible implementations, the time interval is greater than or equal to T/2, where T is a transmission period of the second modulated signal in the time domain.

In some possible implementations, the first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A=1-β.

In some possible implementations, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol, the second modulated signal and the pilot symbol are located in the same time unit, the pilot symbol includes a frequency domain sequence that has not been processed in the time domain, and the bandwidth for sending the pilot symbol is the same as the bandwidth for sending the second modulated signal.

Exemplarily, sending the second modulated signal includes: sending the second modulated signal and pilot symbols in the same time unit (e.g., the same radio frame), the pilot symbols including frequency-domain pilot signals, such as a Zadoff-Chu sequence (also known as a ZC sequence), or an m-sequence in which the modulated signal is a QPSK signal. The second modulated signal includes the above-mentioned single-carrier signal that has undergone bandwidth expansion/compression, and the pilot symbols include signals that have not undergone the above-mentioned bandwidth expansion/compression (i.e., the pilot symbol representation signal is directly mapped to the bandwidth after bandwidth expansion/compression after generation, without undergoing the same DFT and bandwidth expansion/compression operations as the second modulated signal, and the expanded/compressed bandwidth is used to transmit the above-mentioned second modulated signal and pilot symbols).

In some possible implementations, the frequency domain sequence includes a constant modulus sequence.

Exemplarily, the frequency domain sequence includes a ZC sequence or an m sequence.

Based on the solution provided in the embodiment of the present application, the signal is amplitude modulated by the first coefficient A, so that the energy of the modulated second modulated signal is more consistent with the energy of the pilot symbol, thereby improving the performance of correct demodulation of the signal, thereby improving communication performance.

In some possible implementations, the second modulated signal satisfies the following conditions:

Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value.

In some possible implementations, the value B of PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

In some possible implementations, Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, where a is a number greater than or equal to 0.

In some possible implementations, f(i) satisfies: f(i)=0; or, f(i)=n(i mod 4y+2), or, f(i)=-n(i mod 4y+2), or, f(i)=n(i mod 4y), or, f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and mod represents a modulo function; the processing unit is specifically configured to modulate the amplitude of the first modulation signal according to the normalization coefficient, and the normalization coefficient C satisfies: Any one of .

In some possible implementations, b(i') represents the signal to be modulated corresponding to the first modulated signal, and i' represents the index of the signal to be modulated; when i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
Alternatively, when i' satisfies any of the following: i'=4i, or i'=4i+1, or i'=4i+2, or i'=4i+3, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,

When i' satisfies any of the following: i'=6i, or i'=6i+1, or i'=6i+2, or i'=6i+3, or i'=6i+4, or i'=6i+5, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

In some possible implementations, b(i') represents a signal to be modulated corresponding to the first modulated signal, and i' represents an index of the signal to be modulated;

When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,

When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,

When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
mod represents the remainder function.

In a sixth aspect, a communication device is provided, comprising: a transceiver unit for receiving a second modulated signal; and a processing unit for demodulating the second modulated signal according to a first coefficient A.

In the seventh aspect, a communication device is provided, which has the function of implementing the methods in the above-mentioned first to third aspects and any possible implementation methods. For example, the communication device includes a module or unit or means corresponding to the operations involved in executing the methods in the above-mentioned first to fourth aspects and any possible implementation methods. The module or unit or means can be implemented by software, or by hardware, or by a combination of software and hardware.

In an eighth aspect, a communication device is provided, comprising one or more processors. The one or more processors may execute part or all of a necessary computer program or instruction stored in a memory for implementing the functions involved in the method of the first to third aspects and any possible implementation thereof. When the computer program or instruction is executed, the communication device implements the method of the first to third aspects and any possible implementation thereof.

In some possible implementations, the communication device may further include an interface circuit, wherein the processor is configured to communicate with other devices or components through the interface circuit.

In some possible implementations, the communication device may further include the memory.

The communication device may be a terminal, or a communication module in a terminal, or a chip in the terminal responsible for communication functions such as a modem chip (also known as a baseband chip) or a SoC or SIP chip including a modem module.

In a ninth aspect, a communication device is provided, comprising: a processor for executing computer instructions so that the device executes the method in the above-mentioned first to third aspects and any possible implementation thereof.

In some possible implementations, the device further includes a memory.

In some possible implementations, the device further includes a communication interface, which is coupled to the processor and is used to input and/or output information.

In a tenth aspect, a computer program product is provided, which, when a computer program in the computer program product is executed by a communication device, implements the methods in the first to third aspects and any possible implementation thereof.

In the eleventh aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer program or instruction is executed by a communication device, the method in the above-mentioned first to third aspects and any possible implementation thereof is implemented.

In the twelfth aspect, a chip (or chip system) is provided, comprising at least one processor for running a computer program so that a device equipped with the chip executes the methods of the first to third aspects above and any possible implementation thereof.

The chip may include an output circuit or interface for sending information or data, and an input circuit or interface for receiving information or data.

In the thirteenth aspect, a communication system is provided, including: a network device and a terminal device, the terminal device is used to execute the methods in the above-mentioned first to third aspects and any possible implementation thereof, and/or the network device is used to execute the methods in the above-mentioned first to third aspects and any possible implementation thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a communication system applicable to an embodiment of the present application.

FIG2 is a schematic diagram of a processing flow of a DFTs-OFDM technology provided in an embodiment of the present application.

FIG3 is a constellation diagram of BPSK modulation and π/2-BPSK modulation provided in an embodiment of the present application.

FIG4 is a schematic diagram of a 16QAM constellation diagram provided in an embodiment of the present application.

FIG5 is a schematic flowchart of signal processing at a transmitting end based on π/2-BPSK modulation or QAM provided in an embodiment of the present application.

FIG6 is a schematic diagram of a signal transmission waveform based on π/2-BPSK modulation or QAM provided in an embodiment of the present application.

FIG7 is a schematic flowchart of signal processing at an SC-OQAM transmitter provided in an embodiment of the present application.

FIG8 is a schematic diagram of an SC-OQAM signal transmission waveform provided in an embodiment of the present application.

FIG9 is a schematic diagram of a DFT-S-OFDM transmitter based on FDSS provided in an embodiment of the present application.

FIG10 is a schematic diagram of frequency domain shaping of DFT-S-OFDM provided in an embodiment of the present application.

FIG11 is a schematic diagram of a method for sending or receiving a signal provided in an embodiment of the present application.

FIG12 is a schematic diagram of a method for determining a modulation mode provided in an embodiment of the present application.

FIG13 is a schematic block diagram of a communication device provided in an embodiment of the present application.

FIG14 is a schematic block diagram of a communication device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The technical solution in this application will be described below with reference to the accompanying drawings.

The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "a", "said", "above", "aforesaid", "the" and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one, two or more. The character "/" generally indicates that the objects associated with each other are in an "or" relationship.

References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

The technical solution provided in this application can be applied to various communication systems, such as: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, wireless local area network (WLAN) system, narrowband Internet of things (NB-IoT) system, global system for mobile communications (GSM), enhanced data rate for GSM evolution system (EDR), etc. The present invention relates to the present invention to a fifth-generation (5G) or new radio (NR) system, a wireless communication system with a rate for GSM evolution (EDGE), wideband code division multiple access (WCDMA) system, code division multiple access 2000 (CDMA2000) system, time division-synchronization code division multiple access (TD-SCDMA) system, and future mobile communication systems, future network architectures, and future evolution systems (such as higher versions of communication systems).

The technical solution provided in this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

In the embodiments of the present application, a terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The embodiments of the present application are described using a terminal device as an example.

Figure 1 is a schematic diagram of a wireless communication system 100 applicable to an embodiment of the present application. As shown in Figure 1, the wireless communication system includes a wireless access network 100. The wireless access network 100 can be a (for example, a higher version) wireless access network in a future mobile communication system, a future network architecture, a future evolution system, etc., or a traditional (for example, 5G, 4G) wireless access network. One or more terminal devices (120a-120j, collectively referred to as 120) can be connected to each other or to one or more network devices (110a, 110b, collectively referred to as 110) in the wireless access network 100. Network elements in the wireless communication system are connected through interfaces (for example, NG, Xn) or air interfaces.

Figure 1 is only a schematic diagram. The wireless communication system may also include other devices, such as core network (CN) devices, wireless relay devices and/or wireless backhaul devices, which are not shown in Figure 1.

The terminal device 120 may be a device that provides voice/data, such as a handheld device or vehicle-mounted device with wireless connection function. Currently, some examples of the terminal device 120 include: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, and wireless terminals in transportation safety. , wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, wearable devices, terminal devices in 5G networks or terminal devices in future evolved public land mobile networks (PLMNs), etc., and the embodiments of the present application are not limited to these.

In the embodiments of the present application, the device for implementing the functions of the terminal device 120, i.e., the terminal device, can be the terminal device, or a device capable of supporting the terminal device in implementing the functions, such as a chip system or chip, which can be installed in the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

In the mobile communication system 100, the network device 110 in the embodiment of the present application may be a device for communicating with a terminal device. The network device 110 may also be referred to as an access network device or a radio access network (RAN) node (or device). For example, the network device 110 may be a base station. The network device 110 in the embodiment of the present application may refer to a radio access network that connects the terminal device 120 to a wireless network. The term "base station" may broadly cover various names as follows, or replace the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station, auxiliary station, multi-standard radio (motor slide retainer, MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned device or apparatus. A base station may also be a mobile switching center, a device that performs base station functions in D2D, V2X, and M2M communications, a future mobile communication system, a future network architecture, a network-side device in a future evolution system, or a device that performs base station functions in a future communication system. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a device including a control plane CU node (central unit-control plane (CU-CP)) and a user plane CU node (central unit user plane (CU-UP)) and a DU node.

In different systems, CU (or CU-CP and CU-UP), DU or radio unit (RU) may have different names, but those skilled in the art will understand their meanings. For example, in an open RAN (ORAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of software and hardware modules.

In the embodiments of the present application, the device for implementing the functions of the network device 110 can be a network device, or a device capable of supporting the network device to implement the functions, such as a chip system or a chip, which can be installed in the network device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

In the embodiments of the present application, a device in the communication system 100 can send signals to or receive signals from another device. The signals may include information, signaling, or data. A device may also be replaced by an entity, a network entity, a communication device, a communication module, a node, a communication node, and the like. This application uses devices as examples for description. For example, the communication system 100 may include at least one terminal device 120 and at least one network device 110. Network device 110 may send downlink signals to terminal device 120, and/or terminal device 120 may send uplink signals to network device 110.

In the embodiments of the present application, before a device sends a signal to another device or after receiving a signal from another device, it is necessary to modulate (mod/demodulate) or demodulate (de-mod/de-modulate) the signal so that the information to be transmitted can be carried on the radio signal or can be parsed from the radio signal. In a communication system, the information to be transmitted can be represented by a bit "0" or "1". Through signal modulation, the bit can be carried on an analog signal with frequency, amplitude, and phase.

It should be understood that Figure 1 is an example of a communication system applicable to an embodiment of the present application, and is a simplified schematic diagram provided for ease of understanding. The above communication system may also include other network devices or other terminal devices, which are not shown in Figure 1. The embodiments of the present application can be applied to any communication scenario in which a transmitting device and a receiving device communicate.

The communication system to which the embodiments of the present application are applied is not limited thereto. In practical applications, the embodiments of the present application are applicable to scenarios with low peak to average power ratio (PAPR) requirements, or to business scenarios with low PAPR and high link quality requirements.

It should be understood that FIG1 is only a simplified schematic diagram for ease of understanding, and the communication system may further include other network devices or other terminal devices, which are not shown in FIG1 .

It should also be understood that Figure 1 is only an example application scenario of the embodiment of the present application, and the present application does not limit the application scenario of the method. The present application can be applied to communication between network devices, communication between network devices and terminal devices, communication between terminal devices, etc., and the embodiments of the present application do not limit this.

The fast Fourier transform (FFT) described in this application is a fast algorithm for implementing the discrete Fourier transform (DFT). The FFT described in this application can also be replaced by other algorithms that can implement the Fourier transform, and this application does not limit this. The inverse fast Fourier transform (IFFT) is a fast algorithm for implementing the inverse discrete Fourier transform (IDFT). The IFFT described in this application can also be replaced by other algorithms that can implement the inverse Fourier transform, and this application does not limit this.

In the embodiments shown below, only for ease of understanding and explanation, the method provided in the embodiments of the present application is described in detail by taking the interaction between a network device and a terminal device as an example.

To facilitate understanding of the embodiments of the present application, the following is a brief introduction to the terms involved in the embodiments of the present application.

(1) Discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-s-OFDM)

Observed in the time domain, wireless signals appear as sinusoidal waves with varying amplitudes, not constant amplitudes. Peak power is the maximum instantaneous power that occurs with a certain probability over a long period of time, typically 0.01%. The ratio of peak power to the system's total average power at this probability is called PAPR, or peak-to-average power ratio. In a communication system based on orthogonal frequency division multiplexing (OFDM), the signal on a single carrier is represented by a sinc function, with tails on the left and right sides. With a certain probability, the tails of multiple carriers can overlap in the distance, forming a single point of high peak power.

Wireless communication systems require power amplification to transmit signals over long distances. Since typical power amplifiers have a limited dynamic range, signals with high PAPR (power-reducing ratio) (PAPR) easily enter the amplifier's nonlinear region, causing nonlinear distortion and significantly degrading overall system performance. Therefore, reducing the PAPR of signals is an urgent issue.

DFT-s-OFDM technology is one of the signal generation methods used in LTE's uplink. DFT-s-OFDM performs an additional discrete Fourier transform (DFT) before the traditional orthogonal frequency division multiplexing (OFDM) process. Therefore, DFT-s-OFDM is also known as linear precoding OFDM.

Please refer to Figure 2, which is a schematic diagram of the processing flow of a DFTs-OFDM technology provided in an embodiment of the present application. In Figure 2, the transmitting end sequentially modulates, performs N-point DFT, subcarrier mapping, IFFT, and adds a cyclic prefix (CP) to the bits to obtain a transmission data stream, and then sends the transmission data stream via radio frequency (RF). When the receiving end receives the transmission data stream, it sequentially performs CP&FFT, subcarrier demapping, equalizer, IDFT, and demodulation (also known as demodulation) on the transmission data stream to obtain bits. Adding a cyclic prefix can avoid symbol interference.

DFT-s-OFDM is essentially a single-carrier operation. Physically speaking, the DFT-s-IFFT operation is essentially equivalent to convolving the input signal with a sinc waveform before the DFT. Because it is still a single-carrier operation, DFT-s-OFDM achieves a lower PAPR than OFDM, improving mobile terminal power transmission efficiency, extending battery life, and reducing terminal costs.

(2) Binary phase shift keying (BPSK) modulation and π/2-BPSK modulation

Phase shift keying (PSK) modulation represents a bit "1" or "0" by changing the phase of the carrier signal. When one electromagnetic wave waveform represents one bit, it is also called BPSK. π/2-BPSK modulation is an enhancement of BPSK modulation. Based on BPSK modulation, symbols can be phase-shifted. Multiplying the zth BPSK-modulated symbol by a phase (BPSK modulation symbol * e ^j2πzK , where K is the phase shift factor) is called rotated BPSK. For example, π/2-BPSK modulation can also be called π/2-rotated BPSK modulation. In BPSK modulation, the phase difference between the input bit "1" and the input bit "0" is π or -π, meaning the absolute value of the phase difference is π. In π/2-BPSK modulation, the phase difference between the kth modulation symbol and the k-1th modulation symbol is equal to the phase difference between the kth modulation symbol and the k+1th modulation symbol, with the absolute value of this phase difference being π/2. Exemplarily, the first modulation symbol is selected from {+1, -1} based on whether the first input bit is "1" or "0," for example, +1 is selected if the first input bit is "1," and -1 is selected if the second input bit is "0." The second modulation symbol is selected from {+j, -j} based on the second input bit, for example, +j is selected if the second input bit is "1," and -j is selected if the second input bit is "0." The third modulation symbol is selected from {+1, -1} based on the third input bit, the fourth modulation symbol is selected from {+j, -j} based on the fourth input bit, and so on. The kth modulation symbol is any modulation symbol in the modulation symbol stream, and π is the number of circles (pi).

For example, see Figure 3, which is a schematic diagram of a modulation scheme provided by an embodiment of the present application. As shown in Figure 3, in BPSK modulation, the transition from an input bit "1" to "0" or "0" to "1" results in a phase shift with an absolute value of π, which increases the PAPR of the signal. In π/2-BPSK modulation, the absolute value of the phase difference between two adjacent modulation symbols is π/2. Changing from π to π/2 can suppress the PAPR of the signal.

It can be understood that the modulation symbols obtained using π/2-BPSK modulation are obtained by performing a phase rotation on the modulation symbols obtained using BPSK modulation. The phase rotation factor is e ^{f(i)×j×π/2} , where f(i)=i mod 2, where i represents the modulation symbol index and mod represents the modulo function. The index can be numbered starting from "1". For example, if the index starts at "1", the modulation symbols obtained using BPSK modulation include -1, 1, 1, -1, 1; then the modulation symbols obtained using π/2-BPSK modulation include -j, -1, -j, -1, j.

For example, the formula of π/2-BPSK modulation may satisfy the following conditions:

The common rotation phase of π/2-BPSK modulation is set to π/4 (i.e., each modulated symbol obtained through π/2-BPSK modulation is rotated by π/4). When the signal index is an odd number such as 1, 3, 5, 7, 9, etc., the constellation point information carried by the symbol modulated by the above π/2-BPSK modulation formula is [0.707+0.707j] or [-0.707-0.707j]. When the signal index is an even number such as 2, 4, 6, 8, 10, etc., the constellation point information carried by the symbol modulated by the above π/2-BPSK modulation formula is [0.707-0.707j] or [-0.707+0.707j]. It can be seen that regardless of whether the modulated bit is "0" or "1", the phase difference between the constellation points obtained by the above π/2-BPSK modulation formula for the signal with an odd index and the constellation points obtained by the above π/2-BPSK modulation formula for the signal with an even index is fixed at 90°.

In order to understand the modulation method more intuitively, a constellation diagram can be used. The constellation diagram helps to define the amplitude and phase of the symbol obtained after modulation. In the constellation diagram, a symbol obtained after modulation is represented by a constellation point, and the bit or bit combination carried by the constellation point is generally written next to it. There are generally two axes in the constellation diagram, where the horizontal axis is related to the in-phase carrier and the vertical axis is related to the orthogonal carrier. The projection of each constellation point in the constellation diagram on the horizontal axis defines the peak amplitude of the in-phase component, and the projection on the vertical axis defines the peak amplitude of the orthogonal component. The length of the line (vector) connecting the constellation point to the origin is the peak amplitude of the symbol, and the angle between the line and the horizontal axis is the phase of the symbol. The value of the unit power P of the constellation diagram of the modulation method includes the average value of the square of the distance between each constellation point and the origin.

See Figure 4, which is a schematic diagram of a 16-quadrature amplitude modulation (16QAM) constellation diagram provided in an embodiment of the present application. A constellation point (or modulation symbol) on the constellation diagram can correspond to four information bits. In 16QAM, there are 2^4 = 16 symbols, each with its own amplitude and phase. 16QAM can have multiple amplitudes, and the phases between each symbol are also different.

The following describes in detail possible implementations of π/2-BPSK modulation or QAM in conjunction with Figures 5 and 6. Figure 5 is a schematic flow chart of signal processing at a transmitter based on π/2-BPSK modulation or QAM provided in an embodiment of the present application. Figure 6 is a schematic diagram of a signal transmission waveform based on π/2-BPSK modulation or QAM provided in an embodiment of the present application. Referring to the signal processing schematic flow chart shown in Figure 5, the transmitter performs modulation, 2x upsampling (up-sampling (2)), pulse shaping, and downsampling (down-sampling) on the signal in sequence. Referring to the waveform schematic diagram shown in Figure 6, the waveform of the modulation symbol obtained by transmitting π/2-BPSK modulation is complex orthogonal, that is, one waveform carries a complex signal, and this waveform and the waveform carrying the next signal are orthogonal (that is, the waveform is 0 at the sampling point of the next waveform carrying the signal). This orthogonality reduces multipath interference.

The modulation symbols obtained by π/2-BPSK modulation can also be applied to single carrier offset quadrature amplitude modulation (SC-OQAM). SC-OQAM separates the real and imaginary parts of the modulation symbols obtained by π/2-BPSK modulation or QAM, crosses the real and imaginary parts, and delays the real and imaginary parts so that the real and imaginary parts of a modulation symbol are transmitted on different waveforms. For example, the real and imaginary parts can be delayed by T/2 (T is the period of the waveform of the transmitted signal), changing the complex orthogonal relationship of the waveform of the transmitted signal into a partially orthogonal relationship between the real and imaginary parts of the signal.

The following describes in detail the possible implementation methods of SC-OQAM in conjunction with Figures 7 and 8. Figure 7 is a schematic flow chart of signal processing at an SC-OQAM transmitter provided in an embodiment of the present application. Figure 7 is a schematic diagram of an SC-OQAM signal transmission waveform provided in an embodiment of the present application. Referring to the schematic flow chart of SC-OQAM signal processing shown in Figure 7, compared to the schematic flow chart of signal processing shown in Figure 5, after the transmitter modulates the signal based on π/2-BPSK or QAM, it separates the real and imaginary parts of the modulated signal and then upsamples it by 2 times, and delays the imaginary signal by T/2 (it can be understood that the real signal can also be delayed by T/2, and this embodiment of the present application does not limit this). Referring to the waveform diagram shown in Figure 8, an SC-OQAM waveform carries the real or imaginary part of the signal alone. Although this waveform and the next waveform carrying the signal are non-orthogonal (that is, the waveform is not 0 at the sampling point of the next waveform carrying the signal), since the information carried by this waveform and the next waveform carrying the signal is orthogonal, the interference is orthogonal with respect to the signal. Due to this partial orthogonality, the receiver can discard the imaginary part when receiving a real signal, and discard the real part when receiving an imaginary signal, thereby correctly recovering the information.

The advantage of SC-OQAM lies in the fact that the peaks of the real signal waveform are superimposed on the non-peaks of the imaginary signal waveform. This staggered peak method effectively reduces PAPR and improves link quality. However, with the π/2-BPSK SC-OQAM modulation scheme, each modulation symbol can only carry one bit of information, resulting in low spectral efficiency. Furthermore, SC-OQAM can only be implemented based on modulation symbols obtained through π/2-BPSK modulation or QAM, making its implementation inflexible.

Exemplarily, the modulation order of π/2-BPSK SC-OQAM modulation is 2, where modulation order = 2 ^x , x is the number of bits carried by the symbol after modulation, and x = 1 for a modulation symbol obtained by π/2-BPSK SC-OQAM modulation.

(3) Frequency domain spectral shaping (FDSS)

According to the convolution theorem, the convolution of two time-domain signals is equivalent to a dot product of the two signals in the frequency domain. Therefore, converting a set of discrete time-domain data into discrete frequency-domain data after performing the DFT, then performing the dot product with a designed spectrum shaping sequence, and then performing the IDFT on the resulting time-domain signal can effectively reduce PAPR. Because the dot product operation is less complex than the convolution operation, this PAPR reduction technique works better in the frequency domain, hence the name FDSS.

Applying FDSS technology to 5G uplink DFT-s-OFDM waveform processing can further reduce the PAPR of 5G uplink signals. The basic idea is to perform a dot product of a designed spectrum-shaping sequence on the frequency domain data after the DFT and before the inverse fast Fourier transform (IFFT) in the DFTs-OFDM waveform processing.

The above describes the time domain implementation of SC-OQAM in conjunction with Figure 7. The following describes the frequency domain implementation of SC-OQAM in conjunction with Figures 9 and 10. Figure 9 is a schematic diagram of a DFT-S-OFDM transmitter based on FDSS provided in an embodiment of the present application. Figure 10 is a schematic diagram of frequency domain shaping of DFT-S-OFDM provided in an embodiment of the present application.

Referring to the transmitter schematic diagram shown in FIG9 , a π/2-BPSK or QAM-based signal used in a DFT-S-OFDM system is separated into real and imaginary parts. This is then upsampled twice, transforming the real part into [X, 0, X, 0, X, 0, …] and the imaginary part into [jY, 0, jY, 0, jY, 0, …]. The imaginary part is then delayed, transforming it into [0, jY, 0, jY, 0, jY, …]. The upsampled real and imaginary parts are then combined to form [X, jY, X, jY, X, jY, …]. The total length of the signal is then doubled compared to the original π/2-BPSK or QAM-based signal. The symbols after the real and imaginary part separation are then subjected to a 2N-point DFT, a filter, subcarrier mapping, and an IFFT. The filter in FIG9 (which can be used to implement FDSS) can employ a raised cosine roll-off filter for spectrum expansion/compression. For example, if the original bandwidth is 10 MHz, after performing FDSS with α = 0.2, the occupied bandwidth is 12 MHz. The filter in FIG9 can also employ a root raised cosine roll-off filter for spectrum expansion/compression, etc., to implement spectrum expansion/compression. The specific filter employed is not limited in this embodiment of the present application.

Referring to the frequency domain shaping diagram shown in Figure 10, due to the separation of the real and imaginary components, the length of the modulated signal is twice that of traditional π/2-BPSK modulation, and the DFT size is also twice that of the DFT for traditional π/2-BPSK modulation. The signal after the DFT has a characteristic of conjugate symmetry: s(n) = s ^(Nn) , which is also represented by D and Flip(D*) shown in Figure 10. Therefore, the data after the DFT is actually redundant, and this redundant signal can be processed through truncated frequency domain filtering. This truncation means that the filter bandwidth is smaller than the bandwidth after the DFT. For example, if the bandwidth after the DFT is 100 resource blocks (RBs), the frequency domain filter can be designed so that the filter with an α of 0.2 is used to transform the DFT signal from 100 RBs to 60 RBs. The filtering process involves directly multiplying the frequency domain filter with the DFT signal. Due to the redundancy in the signal, truncation does not cause any performance loss. After truncation, the signal can be subjected to IFFT, CP addition, and transmission.

Observed in the time domain, wireless signals appear as sinusoidal waves with varying amplitudes. The amplitude is not constant, and the peak amplitude within one cycle is different from the peak amplitude within another cycle. Therefore, the average power and peak power within each cycle are different. Over a long period of time, peak power is the maximum instantaneous power that occurs with a certain probability, typically 0.01%. The ratio of peak power at this probability to the system's total average power is the peak-to-average power ratio (PAPR), or PAPR for short. In OFDM-based communication systems, the signal on a single carrier is represented by a sinc function, with tails on the left and right sides. With a certain probability, the tails of multiple carriers can overlap in the distance, forming a single point of high peak power.

Wireless communication systems require power amplification for long-distance signal transmission. Since typical power amplifiers have a limited dynamic range, signals with high PAPR (Power Reduction Pulse Ratio) (PAPR) easily enter the nonlinear region of the amplifier, causing nonlinear distortion and significantly degrading overall system performance. Therefore, reducing the PAPR of signals is a pressing technical challenge.

In view of this, embodiments of the present application provide a signal transmission method and a communication device, which can achieve a lower PAPR and improve link quality by designing a signal modulation method.

The following is an introduction to the signal transmission method provided in the embodiment of the present application.

FIG11 is a schematic diagram of a method 1100 for sending or receiving a signal provided in an embodiment of the present application. Referring to FIG11 , the method 1100 may include the following steps:

S1101, modulate a signal to be modulated according to a first modulation method to obtain a first modulated signal.

Specifically, the signal transmitter may modulate the signal to be modulated according to a first modulation method to obtain the first modulated signal. The first modulation method may include modulating the amplitude of the signal to be modulated, or the first modulation method may include modulating the phase of the signal to be modulated.

The first modulation method includes modulating the amplitude of the modulated signal. The first modulation method can be a modulation method that maps the discrete amplitudes of the digital signal to a continuous amplitude. For example, pulse amplitude modulation (PAM) is used. The principle of PAM modulation is to change the amplitude of the carrier at each discrete time interval based on the amplitude value of the original digital signal, so that the carrier can carry the information of the original digital signal. PAM modulation can increase the information capacity of the transmission by adjusting the number of energy levels corresponding to the amplitude. For example, in 2PAM modulation, the number of energy levels corresponding to the amplitude is 1, and the value B of the energy level corresponding to the first modulation signal obtained by modulating the amplitude of the carrier can take any one of {1; -1}. One modulated signal carries 1 bit of information, and the modulation order is 2 ¹ = 2; in 4PAM modulation, the number of energy levels corresponding to the amplitude is 2, and the value B of the energy level corresponding to the first modulation signal obtained by modulating the amplitude of the carrier can take any one of {1; -1; 3; -3}. One modulated signal carries 2 bits of information, and the modulation order is 2 ² = 4; in 8PAM modulation, the number of energy levels corresponding to the amplitude is 4, and the value B of the energy level corresponding to the first modulation signal obtained by modulating the amplitude of the carrier can take any one of {1; -1; 3; -3; 5; -5; 7; -7}. One modulated signal carries 3 bits of information, and the modulation order is 2 ³ = 8.

It can be understood that in PAM modulation of different modulation orders, the energy level value B corresponding to the first modulation signal obtained by modulating the amplitude of the carrier can satisfy any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

The first modulation method includes modulating the phase of the modulated signal. The first modulation method can be a modulation method that changes the phase of the carrier, such as BPSK modulation; or the first modulation method can be a modulation method that maps the discrete amplitude of the digital signal to continuous amplitude and phase, such as QAM.

PSK modulation can increase the information capacity of transmission by adjusting the number of energy levels corresponding to the amplitude. For example, in BPSK modulation, the number of energy levels corresponding to the amplitude is 1. The energy level value B corresponding to the first modulated signal obtained by modulating the carrier's amplitude can be any one of {1; -1}. One modulated signal carries one bit of information, and the modulation order is 2 ¹ = 2. In quadrature phase shift keying (QPSK) modulation, the number of energy levels corresponding to the amplitude is 2. The energy level value B corresponding to the first modulated signal obtained by modulating the carrier's amplitude can be any one of {1; -1; 3; -3}. One modulated signal carries two bits of information, and the modulation order is 2 ² = 4.

QAM can increase the information capacity of transmission by adjusting the number of energy levels corresponding to the amplitude. For example, in 4QAM modulation, the number of energy levels corresponding to the amplitude is 1, and the energy level value B corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1}. One modulated signal carries 2 bits of information (wherein 1 bit of information represents amplitude and the other bit of information represents phase), and the modulation order is 2 ² = 4. In 16QAM modulation, the number of energy levels corresponding to the amplitude is 2, and the energy level value B corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can be any one of {1; -1; 3; -3}. One modulated signal carries 4 bits of information (wherein 2 bits of information represent amplitude and the other 2 bits of information represent phase), and the modulation order is 2 ⁴ =16; in 64QAM modulation, the number of energy levels corresponding to the amplitude is 4, and the value B of the energy level corresponding to the first modulated signal obtained by modulating the amplitude of the carrier can take any one of {1; -1; 3; -3; 5; -5; 7; -7}. One modulated signal carries 6 bits of information (of which 3 bits represent amplitude and the other 3 bits represent phase), and the modulation order is 2 ⁶ =64.

It can be understood that in QAM modulation with different modulation orders, the energy level value B corresponding to the first modulation signal obtained by modulating the amplitude of the carrier can satisfy any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

It can be understood that the above-mentioned first modulation mode can be a 2nd order, 4th order, 8th order or higher order modulation mode. If the modulation mode is 4th order, then each first modulation signal carries 2 bits of information; if the modulation mode is 8th order, then each first modulation signal carries 3 bits of information; if the modulation mode is 16th order, then each first modulation signal carries 4 bits of information.

It is understandable that the above-mentioned modulation order of the first modulation mode, the number of bits of information carried by the first modulation signal obtained according to the first modulation mode, and the value range of the energy level corresponding to the first modulation signal are merely examples. Those skilled in the art can, based on the above-mentioned examples, derive a higher-order modulation mode, a first modulation signal, the correspondence between the higher-order modulation mode and the first modulation signal, and the value range of the energy level corresponding to the first modulation signal without any creative work. The embodiments of the present application are not limited to this.

It is understood that the transmitting end of the above-mentioned signal may be a terminal device, and the terminal device may send the signal obtained through method 1100 to a network device/another terminal device; or the transmitting end of the above-mentioned signal may be a network device, and the network device may send the signal obtained through method 1100 to a terminal device/another network device. This embodiment of the present application is not limited to this.

S1102: Modulate the first modulated signal according to a second modulation method to obtain a second modulated signal.

Specifically, the signal transmitter may modulate the first modulated signal according to a second modulation method to obtain a second modulated signal. The second modulation method may include phase modulation, the second modulated signal is a complex signal, or the second modulation method may include modulating the amplitude of the first modulated signal according to the first coefficient A.

In some possible implementations, after obtaining a first modulation signal that modulates the amplitude of the modulated signal according to a first modulation method, the signal transmitter can modulate multiple first modulation signals according to a second modulation method to obtain m second modulation signals, wherein the second modulation method includes phase modulation, the second modulation signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulation signals satisfy: the phase difference Q between any two adjacent second modulation signals in the time domain satisfies: Q = n*π/2, or, Q = -n*π/2, and n is an integer greater than or equal to 1.

Exemplarily, the phase of the first modulation signal is modulated, and among the m second modulation signals obtained, any two adjacent second modulation signals in the time domain satisfy: the phase of the latter second modulation signal is n*π/2 larger than the phase of the former second modulation signal. For example, among the second modulation signals obtained, the phase of the fifth second modulation signal is 5*π/2, the phase of the fourth second modulation signal is 4*π/2, and the phase of the third second modulation signal is 3*π/2; or, any two adjacent second modulation signals in the time domain satisfy: the phase of the latter second modulation signal is n*π/2 smaller than the phase of the former second modulation signal. For example, the phase of the seventh second modulation signal is 3*π/2, the phase of the sixth second modulation signal is 4*π/2, and the phase of the fifth second modulation signal is 2*π/2.

In some possible implementations, the second modulated signal includes a real signal and an imaginary signal.

In some possible implementations, the phase modulation may include at least any one of the following: modulating the first modulation signal according to a common phase rotation; or modulating the first modulation signal according to a rotation phase value.

In some possible implementations, modulating the first modulated signal according to a common phase rotation includes rotating the phases of a plurality of first modulated signals obtained by the first modulation method, where the rotated phase value may include a common phase rotation value.

Exemplarily, when the common rotation phase value is π/16, the phases of multiple first modulation signals obtained by the first modulation method are rotated by a phase value of π/16; when the common rotation phase value is π/8, the phases of multiple first modulation signals obtained by the first modulation method are rotated by a phase value of π/8; when the common rotation phase value is π/4, the phases of multiple first modulation signals obtained by the first modulation method are rotated by a phase value of π/4; when the common rotation phase value is π/2, the phases of multiple first modulation signals obtained by the first modulation method are rotated by a phase value of π/2.

Exemplarily, the value of the common phase rotation may be associated with the index i of the second modulation signal. For example, when the index i of the second modulation signal is an odd number, the common rotation phase value is π/4, and when the index i of the second modulation signal is an even number, the common rotation phase value is -π/4; or, when the index i of the second modulation signal is an odd number, the common rotation phase value is -π/4, and when the index i of the second modulation signal is an even number, the common rotation phase value is π/4. For another example, when the index i of the second modulation signal is an odd number, the common rotation phase value is π/2, and when the index i of the second modulation signal is an even number, the common rotation phase value is 0; or, when the index i of the second modulation signal is an odd number, the common rotation phase value is 0, and when the index i of the second modulation signal is an even number, the common rotation phase value is π/2.

It is understandable that the value of the common phase rotation can take any value, and the embodiment of the present application does not limit this.

In some possible implementations, modulating the first modulation signal according to the rotation phase value includes rotating the phase of the first modulation signal obtained by the first modulation method, and the rotated phase value may include a phase rotation value.

Exemplarily, the phase rotation value may be associated with the index of the second modulation signal. For example, when the index i of the second modulation signal is odd, the rotation phase value is π/4; when the index i of the second modulation signal is even, the rotation phase value is -π/4; or, when the index i of the second modulation signal is odd, the rotation phase value is -π/4; when the index i of the second modulation signal is even, the rotation phase value is π/4. For another example, the rotation phase value is inπ/2.

It is understandable that the above-mentioned phase modulation may include the above-mentioned phase rotation and the above-mentioned common phase rotation, or may include only the above-mentioned phase rotation, or may include only the above-mentioned common phase rotation. Any phase modulation that rotates the phase of the first modulated signal and makes the phase difference Q of any two adjacent second modulated signals in the time domain satisfy: Q = n*π/2, or Q = -n*π/2 may be included in the embodiments of the present application. The embodiments of the present application are not limited to this.

Based on the solution provided in the embodiments of the present application, a modulated signal can be obtained by performing amplitude modulation, phase modulation, or amplitude and phase modulation on the modulated signal, which enriches the choice of signal modulation methods and enables the device to choose to use a flexible modulation method to modulate the signal according to the actual communication situation, thereby improving communication performance.

In some possible implementations, after obtaining a first modulation signal that modulates the amplitude of a modulated signal according to a first modulation method, the signal transmitter may further modulate the amplitude of the first modulation signal according to a first coefficient A to obtain m second modulation signals. The second modulation method includes modulating the amplitude of the first modulation signal according to the first coefficient A, and the first coefficient A is at least related to any one of the following: a roll-off factor α, or a spectrum extension factor β.

Specifically, the number of subcarriers transmitting the modulated signal may be expanded or compressed. Modulating the first modulated signal according to the second modulation method may include: modulating the amplitude of the first modulated signal according to a first coefficient A related to the expansion or compression.

In some possible implementations, after obtaining a first modulation signal that modulates the phase of the modulated signal according to a first modulation method, the signal transmitter can modulate the first modulation signal according to a second modulation method to obtain a second modulation signal, and the second modulation method includes modulating the amplitude of the first modulation signal according to a first coefficient A, and the first coefficient A is at least related to any one of the following items: a roll-off factor α, or a spectrum expansion factor β.

Specifically, the number of subcarriers transmitting the modulated signal can be expanded or compressed, and modulating the first modulated signal according to the second modulation method can include: phase modulating the first modulated signal, and modulating the amplitude of the first modulated signal according to a first coefficient A related to the expansion or compression.

Without spectrum expansion, for each modulated symbol, N' modulation symbols are transmitted, corresponding to the allocation of N' subcarriers for transmission. Spectrum expansion, that is, increasing the number of transmitted subcarriers, can achieve a lower PAPR or a lower block error rate (BLER). The cost of spectrum expansion is the temporary use of more frequency resources, which reduces spectrum efficiency. The magnitude of spectrum expansion is generally expressed by a roll-off factor α or a spectrum expansion factor β. The bandwidth occupied by the expanded symbol is 1+α times or 1/(1-β) times the original bandwidth. Spectrum compression, that is, reducing the number of transmitted subcarriers, can reduce frequency resource usage and improve spectrum efficiency. The magnitude of spectrum compression is generally expressed by a roll-off factor α or a spectrum expansion factor β. The bandwidth occupied by the compressed symbol is 1/(1+α) times or 1-β times the original bandwidth.

The roll-off factor α may satisfy: α = (number of transmission subcarriers / number of QAM modulation symbols) - 1; or, α = (transmission signal bandwidth / QAM symbol rate) - 1; or, α = (transmission signal bandwidth / signal Nyquist Saud bandwidth) - 1. The spectrum spreading factor β may satisfy: β = (number of transmission subcarriers - number of QAM modulation symbols) / number of transmission subcarriers; or, β = (transmission signal bandwidth - QAM symbol rate) / transmission signal bandwidth; or, β = (transmission signal bandwidth - signal Nyquist Saud bandwidth) / transmission signal bandwidth.

Based on the solution provided in the embodiments of the present application, by expanding the number of subcarriers for transmitting modulated signals, the PAPR of signal transmission can be reduced and the link quality can be improved. Alternatively, by compressing the number of subcarriers for transmitting modulated signals, the occupancy of frequency resources can be reduced and the spectrum efficiency can be improved, thereby improving communication performance.

In some possible implementations, modulating the amplitude of the first modulation signal according to the first coefficient A may include: multiplying the amplitude of the first modulation signal by the first coefficient A.

Exemplarily, the amplitude of the first modulated signal is multiplied by a first coefficient A, and the first coefficient A satisfies: A=M(α+1), or A=M/(1-β), or A=M/(α+1), or A=M(1-β), M>0.

Based on the solution provided in the embodiments of the present application, by performing amplitude modulation on the signal according to spectrum expansion or compression, the amplitude of the modulated signal can be made to better match the bandwidth of transmitting the modulated signal, thereby improving the error performance of the signal transmission and thus improving the communication performance.

In some possible implementations, the first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A=1-β.

Specifically, when the bandwidth is expanded, the first coefficient A may satisfy: A=α+1, or A=1/(1-β); when the bandwidth is compressed, the first coefficient A may satisfy: A=1/(α+1), or A=1-β.

S1103, send a second modulated signal.

Specifically, after the signal transmitting end obtains the second modulated signal, it can send the second modulated signal to the signal receiving end.

In some possible implementations, sending the second modulated signal includes: any two adjacent second modulated signals in the time domain have a time interval.

In some possible implementations, the time interval is greater than or equal to T/2, where T is a transmission period of the second modulated signal in the time domain.

Exemplarily, half of any two adjacent and orthogonal second modulation signals in the time domain are delayed by T/2, so that there is a time interval between the transmission of any two adjacent second modulation signals in the time domain.

Exemplarily, the transmission mode of any two adjacent second modulated signals in the time domain is set to be equivalent to the signal transmission mode of OQAM.

Based on the solution provided in the embodiment of the present application, by transmitting any two adjacent second modulation symbols in the time domain with a time interval, and transmitting the peak of the waveform of one second modulation signal among any two adjacent second modulation signals in the time domain, and superimposing the non-peak of the waveform of the other second modulation signal, the PAPR can be effectively reduced, the link quality can be improved, and thus the communication performance can be improved.

In some possible implementations, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol, the second modulated signal and the pilot symbol are located in the same time unit, the pilot symbol includes a frequency domain sequence that has not been processed in the time domain, and the bandwidth for sending the pilot symbol is the same as the bandwidth for sending the second modulated signal.

Exemplarily, sending the second modulated signal includes: sending the second modulated signal and a pilot symbol in the same time unit (for example, the same radio frame), the pilot symbol including a frequency domain pilot signal, such as a Zadoff-Chu sequence (also known as a ZC sequence), or an m-sequence whose modulation signal is a QPSK signal. The second modulated signal includes the above-mentioned single-carrier signal that has undergone bandwidth expansion/compression, and the pilot symbol includes a signal that has not undergone the above-mentioned bandwidth expansion/compression (that is, the pilot symbol representation signal is directly mapped to the bandwidth after bandwidth expansion/compression after generation, without undergoing discrete Fourier transform (DFT) and bandwidth expansion/compression operations like the second modulated signal, and the bandwidth after expansion/compression is used to transmit the above-mentioned second modulated signal and pilot symbol).

In some possible implementations, the frequency domain sequence includes a constant modulus sequence.

A constant modulus sequence is a sequence whose modulus is always 1. The amplitude of the constant modulus sequence is constant, and its graph can be viewed as a unit circle.

Exemplarily, the frequency domain sequence includes a Zadoff-Chu sequence (ZC sequence) or an m sequence.

In the prior art, the generated ZC sequence can be DFT-processed and then mapped to the subcarriers for transmitting pilot symbols (for example, after performing DFT processing on the ZC sequence, the spectrum of the DFT-processed ZC sequence is then expanded/compressed according to the expansion/compression of the transmission bandwidth. The DFT processing and spectrum expansion/compression performed on the ZC sequence can be the same as the DFT processing and spectrum expansion/compression performed on the PAM signal). Alternatively, the generated ZC sequence can be directly mapped to the subcarriers for transmitting pilot symbols without performing time domain processing (for example, without performing DFT processing). When the generated ZC sequence is directly mapped to the subcarriers for transmitting pilot symbols without performing DFT, since the modulation of the second modulated signal includes bandwidth expansion/compression, and the pilot symbols corresponding to the second modulated signal do not undergo the above-mentioned bandwidth expansion/compression, the energy of the second modulated signal, which is amplitude modulated according to the first coefficient A, can be more consistent with the energy of the corresponding pilot symbols.

It can be understood that when the bandwidth is expanded, the first coefficient A can satisfy: A=α+1, or A=1/(1-β); when the bandwidth is compressed, the first coefficient A can satisfy: A=1/(α+1), or A=1-β.

Based on the solution provided in the embodiment of the present application, the signal is amplitude modulated by the first coefficient A, so that the energy of the modulated second modulated signal is more consistent with the energy of the pilot symbol, thereby improving the performance of correct demodulation of the signal, thereby improving communication performance.

In some possible implementations, the second modulated signal may satisfy the following conditions:

Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value for modulating the phase of the first modulation signal, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value of the second modulation signal.

Specifically, the above-mentioned modulation of the first modulation signal PAM_signal according to the second modulation mode may include: modulating the amplitude of the first modulation signal according to the normalization coefficient C, the normalization coefficient C may include the unit power P of the constellation diagram of the first modulation mode, and the normalization coefficient C may also include the above-mentioned first coefficient A; modulating the phase of the first modulation signal according to the rotation phase value f(i) and/or the common rotation phase value Com_Phase_Rot.

The common rotation phase value is a value for performing phase rotation on all first modulated signals. It is understood that Com_Phase_Rot can take any value, or Com_Phase_Rot can take 0, or Com_Phase_Rot can take a fixed value that facilitates the operation of the communication system. This embodiment of the present application does not limit this.

In some possible implementations, the value B of the PAM_signal can represent the energy level corresponding to the first modulated signal, and the value B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1.

In some possible implementations, the Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, and a is a number greater than or equal to 0.

Illustratively, Com_Phase_Rot=e ^jπ/2 , or Com_Phase_Rot=e ^jπ/4 , or Com_Phase_Rot=e ^jπ/8 , or Com_Phase_Rot=e ^jπ/16 .

In some possible implementations, the f(i) satisfies: f(i) = 0, or f(i) = ni, or f(i) = -ni, or f(i) = n(i mod 4y+2), or f(i) = -n(i mod 4y+2), or f(i) = n(i mod 4y), or f(i) = -n(i mod 4y), where y is an integer greater than or equal to 0, n is an integer greater than or equal to 1, and mod represents the remainder function.

In some possible implementations, the normalization coefficient C satisfies: Any of, or Any of, or Any one of .

It can be understood that the value of the normalization coefficient C can be the unit power P of the constellation diagram of the first modulation mode for modulating the signal to be modulated.

In some possible implementations, the signal to be modulated is phase modulated according to the first modulation method, and the obtained first modulation signal may include a QAM signal. When the QAM signal is modulated according to the second modulation method, f(i)=0 and Com_Phase_Rot=e ⁰ may be taken.

For example, when the QAM signal is a 4QAM signal, The second modulated signal satisfies:
or,

Accordingly, the result of separating the second modulated signal satisfies:

and or, and

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following, or in other words, when i' satisfies any of the following: i'＝2i, or, i'＝2i+1, the value of the energy level corresponding to the 4QAM signal satisfies (1-2b(2i)) or (1-2b(2i+1)), b(2i) and b(2i+1) are the bits of the signal to be modulated, and 2i and 2i+1 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 4QAM signal can be any of {1; -1}.

Exemplarily, when the second modulation signal is a 4QAM signal, the information carried by the second modulation signal with index 0 includes the bits of the signals to be modulated with index 0 and index 1; the information carried by the second modulation signal with index 1 includes the bits of the signals to be modulated with index 2 and index 3.

For example, when the QAM signal is a 16QAM signal, The second modulated signal satisfies:
or,
or,
or,
or,
or,
or,
or,
Accordingly,
The result of separating the second modulated signal satisfies:
and or,
and or,
and or,
and or,
and or,
and or,
and or,
and

In which, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following items, or in other words, when i' satisfies any of the following items: i'=4i, or i'=4i+1, or i'=4i+2, or i'=4i+3, the value of the energy level corresponding to the 16QAM signal satisfies (1-2b(4i)), (1-2b(4i+1)), (1-2b(4i+2)) or (1-2b(4i+3)), b(4i), b(4i+1), b(4i+2) and b(4i+3) are the bits of the signal to be modulated, and 4i, 4i+1, 4i+2 and 4i+3 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be ‘0’ or ‘1’, and the value of the energy level corresponding to the 16QAM signal can be any one of {1; -1; 3; -3}.

It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

Wherein, F represents the mapping of the signal to be modulated. The real part of the second modulated signal is first mapped to the signal to be modulated with index 4i, and then mapped to the signal to be modulated with index 4i+2. The order of F(4i) and F(4i+2) in the real part of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the signal to be modulated with index 4i+2, and then mapped to the signal to be modulated with index 4i. Similarly, the order of F(4i+1) and F(4i+3) in the imaginary part of the second modulated signal can be arbitrarily swapped.

Exemplarily, when the second modulation signal is a 16QAM signal, the information carried by the second modulation signal with index 0 includes bits of the signals to be modulated with index 0, index 1, index 2 and index 3; the information carried by the second modulation signal with index 1 includes bits of the signals to be modulated with index 4, index 5, index 6 and index 7.

When the QAM signal is a 64QAM signal, take The second modulated signal satisfies:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
Accordingly, the result of separating the second modulated signal satisfies:
and
or,
and
or,
and
or,
and
or,
and
or,
and
or,
and
or,
and
or,
and
or,
and
or,
and
or,
and

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following, or in other words, when i' satisfies any of the following: i'=6i, or i'=6i+1, or i'=6i+2, or i'=6i+3, or i'=6i+4, or i'=6i+5, the value of the energy level corresponding to the 64QAM signal satisfies (1-2b (6i)), (1-2b(6i+1)), (1-2b(6i+2)), (1-2b(6i+3)), (1-2b(6i+4)) or (1-2b(6i+5)), b(6i), b(6i+1), b(6i+2), b(6i+3), b(6i+4) and b(6i+5) are bits of the signal to be modulated, and 6i, 6i+1, 6i+2, 6i+3, 6i+4 and 6i+5 are indexes i' of the bits of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 64QAM signal can be any one of {1; -1; 3; -3; 5; -5; 7; -7}.

It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

Among them, F represents the mapping of the signal to be modulated, and the real part of the second modulated signal is first mapped to the signal to be modulated with an index of 6i, and then mapped to the signal to be modulated with an index of 6i+2, and then mapped to the signal to be modulated with an index of 6i+4. The order of F(6i), F(6i+2), and F(6i+4) in the real part of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the signal to be modulated with an index of 6i+4, and then mapped to the signal to be modulated with an index of 6i, and then mapped to the signal to be modulated with an index of 6i+2, or any other arbitrary order. Similarly, the order of F(6i+1), F(6i+3), and F(6i+5) in the imaginary part of the second modulated signal can be arbitrarily swapped.

Exemplarily, when the second modulation signal is a 64QAM signal, the information carried by the second modulation signal with index 0 includes bits of the signals to be modulated with index 0, index 1, index 2, index 3, index 4 and index 5; the information carried by the second modulation signal with index 1 includes bits of the signals to be modulated with index 6, index 7, index 8, index 9, index 10 and index 11.

In some possible implementations, the phase modulated signal to be modulated is subjected to a first modulation scheme, and the obtained first modulated signal may include a BPSK signal. When the BPSK signal is modulated according to a second modulation scheme, f(i)=imod2, C=1, and Com_Phase_Rot=e ^jπ/4 may be taken, and the second modulated signal satisfies:

In some possible implementations, phase modulating the signal to be modulated according to the first modulation scheme may result in the first modulated signal including a PAM signal. When modulating the PAM signal according to the second modulation scheme, f(i)=i and Com_Phase_Rot=e ^jπ/4 , or f(i)=i and Com_Phase_Rot=e ⁰ .

Exemplarily, the PAM signal is modulated according to the second modulation mode, and f(i)=i, and Com_Phase_Rot=e ^jπ/4 .

Exemplarily, when the PAM signal is a 2PAM signal, C=1, and the second modulation signal satisfies:
or,

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal satisfies the index i' of the signal to be modulated corresponding to the first modulation signal, or in other words, when i' satisfies: i'=i, the value of the energy level corresponding to the 2PAM signal satisfies (1-2b(i)), b(i) is the bit of the signal to be modulated, and i is equal to the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 2PAM signal can be any one of {1; -1}.

For example, when the PAM signal is a 4PAM signal, The second modulated signal satisfies:
or,
or,
or,

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following, or in other words, when i' satisfies any of the following: i'＝2i, or, i'＝2i+1, the energy level corresponding to the 4PAM signal satisfies (1-2b(2i)) or (1-2b(2i+1)), b(2i) and b(2i+1) are the bits of the signal to be modulated, and 2i and 2i+1 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 4PAM signal can be any of {1; -1; 3; -3}.

It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

Wherein, F represents the mapping of the to-be-modulated signal, and the real part of the second modulated signal is first mapped to the to-be-modulated signal with index 2i, and then mapped to the to-be-modulated signal with index 2i+1. The order of F(2i) and F(2i+1) in the real part of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the to-be-modulated signal with index 2i+1, and then mapped to the to-be-modulated signal with index 2i.

Exemplarily, when the second modulation signal is a 4PAM signal, the information carried by the second modulation signal with index 0 includes the bits of the signals to be modulated with index 0 and index 1; the information carried by the second modulation signal with index 1 includes the bits of the signals to be modulated with index 2 and index 3.

For example, when the PAM signal is an 8PAM signal, The second modulated signal satisfies:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following, or in other words, when i' satisfies any of the following: i'＝3i, or, i'＝3i+1, or, i'＝3i+2, the energy level corresponding to the 8PAM signal satisfies (1-2b(3i)), (1-2b(3i+1)) or (1-2b(3i+2)), b(3i), b(3i+1) and b(3i+2) are the bits of the signal to be modulated, and 3i, 3i+1 and 3i+2 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 8PAM signal can be any of {1; -1; 3; -3; 5; -5; 7; -7}.

It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

Wherein, F represents the mapping of the signal to be modulated, and the real part of the second modulated signal is first mapped to the signal to be modulated with an index of 3i, then mapped to the signal to be modulated with an index of 3i+1, and then mapped to the signal to be modulated with an index of 3i+2. The order of F(3i), F(3i+1), and F(3i+2) of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the signal to be modulated with an index of 3i+2, then mapped to the signal to be modulated with an index of 3i+1, and then mapped to the signal to be modulated with an index of 3i.

Exemplarily, the PAM signal is modulated according to the second modulation mode, and f(i)=i, and Com_Phase_Rot=e ⁰ .

Exemplarily, when the PAM signal is a 2PAM signal, C=1, and the second modulation signal satisfies:
or,

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal satisfies the index i' of the signal to be modulated corresponding to the first modulation signal, or in other words, when i' satisfies: i'=i, the value of the energy level corresponding to the 2PAM signal satisfies (1-2b(i)), b(i) is the bit of the signal to be modulated, and i is equal to the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 2PAM signal can be any one of {1; -1}.

For example, when the PAM signal is a 4PAM signal, The second modulated signal satisfies:
or,
or,
or,

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following, or in other words, when i' satisfies any of the following: i'＝2i, or, i'＝2i+1, the energy level corresponding to the 4PAM signal satisfies (1-2b(2i)) or (1-2b(2i+1)), b(2i) and b(2i+1) are the bits of the signal to be modulated, and 2i and 2i+1 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 4PAM signal can be any of {1; -1; 3; -3}.

It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

Wherein, F represents the mapping of the to-be-modulated signal, and the real part of the second modulated signal is first mapped to the to-be-modulated signal with index 2i, and then mapped to the to-be-modulated signal with index 2i+1. The order of F(2i) and F(2i+1) in the real part of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the to-be-modulated signal with index 2i+1, and then mapped to the to-be-modulated signal with index 2i.

Exemplarily, when the second modulation signal is a 4PAM signal, the information carried by the second modulation signal with index 0 includes the bits of the signals to be modulated with index 0 and index 1; the information carried by the second modulation signal with index 1 includes the bits of the signals to be modulated with index 2 and index 3.

For example, when the PAM signal is an 8PAM signal, The second modulated signal satisfies:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,

Wherein, b(i') represents the signal to be modulated corresponding to the first modulation signal, and i' represents the index of the signal to be modulated; when the index i of the first modulation signal and the index i' of the signal to be modulated corresponding to the first modulation signal satisfy any of the following, or in other words, when i' satisfies any of the following: i'＝3i, or, i'＝3i+1, or, i'＝3i+2, the energy level corresponding to the 8PAM signal satisfies (1-2b(3i)), (1-2b(3i+1)) or (1-2b(3i+2)), b(3i), b(3i+1) and b(3i+2) are the bits of the signal to be modulated, and 3i, 3i+1 and 3i+2 are the index i' of the bit of the signal to be modulated carried by the second modulation signal. The bit of the signal to be modulated can be '0' or '1', and the value of the energy level corresponding to the 8PAM signal can be any of {1; -1; 3; -3; 5; -5; 7; -7}.

It is understandable that, after the modulation method is used to modulate the to-be-modulated signal, a second modulation signal is obtained. The mapping order of the second modulation signal to the bits of the to-be-modulated signal can be any order, and the embodiment of the present application does not limit this. For example, the obtained second modulation signal satisfies:

Wherein, F represents the mapping of the signal to be modulated, and the real part of the second modulated signal is first mapped to the signal to be modulated with an index of 3i, then mapped to the signal to be modulated with an index of 3i+1, and then mapped to the signal to be modulated with an index of 3i+2. The order of F(3i), F(3i+1), and F(3i+2) of the second modulated signal can also be arbitrarily swapped, so that the real part of the second modulated signal is first mapped to the signal to be modulated with an index of 3i+2, then mapped to the signal to be modulated with an index of 3i+1, and then mapped to the signal to be modulated with an index of 3i.

Based on the solution provided in the embodiment of the present application, the modulated signal can carry 2 or more bits. A signal carrying more than 2 bits can improve spectrum efficiency.

The above describes a method for transmitting a signal. The following describes a method for receiving a signal. This method for receiving a signal can be performed by a receiving end of the signal. For example, the receiving end of the signal can be a terminal device, which can use this method to receive a modulated signal transmitted by a network device or another terminal device. Alternatively, the receiving end of the signal can be a network device, which can use this method to receive a modulated signal transmitted by a terminal device or another network device. This embodiment of the present application is not limited to this.

A signal receiving method includes: receiving a second modulated signal, and demodulating the second modulated signal according to a first coefficient A.

Specifically, after receiving the second modulated signal, the signal receiving end can demodulate the second modulated signal according to the above-mentioned first coefficient A to obtain the information carried by the modulated signal.

Exemplarily, the receiving end of the signal demodulates the second modulated signal and needs to calculate the distance from the origin of the constellation diagram based on the constellation point corresponding to the second modulated signal. The value of the distance between the constellation point of the second modulated signal amplitude-modulated according to the first coefficient A and the origin of the constellation diagram is correlated with the first coefficient A.

Based on the solution provided in the embodiment of the present application, the modulated signal is demodulated according to the first coefficient, so that the demodulation result of the signal can be more consistent with the modulated signal before modulation, obtaining a more accurate demodulation result, better recovering the signal, and improving the error performance.

Optionally, in an embodiment of the present application, before the network device and the terminal device communicate through modulated symbols, it is necessary to determine the modulation mode. The determined modulation mode can enable the modulation symbols sent by the transmitter and modulated by the determined modulation mode to be correctly parsed after being received by the receiver. The above-mentioned determination of the modulation mode may include determining the modulation mode based on the modulation parameters reported by the terminal device to the network device; it may also include determining the modulation mode not based on the modulation parameters reported by the terminal device to the network device; it may also be that the network device and/or the terminal device modulates according to a default modulation mode, and the default modulation mode may be agreed upon by the protocol, or it may be that the network device/terminal device notifies the terminal device/network device in advance through other means. The embodiment of the present application does not limit this.

It can be understood that after the receiving end of the signal (for example, the terminal device/network device that receives the modulated signal sent by the network device/terminal device) receives the signal sent using the above-mentioned modulation method, it can demodulate the signal according to the modulation method to obtain the information carried by the signal.

For example, the above modulation mode can be determined by a method 1200 for determining a modulation mode. FIG12 is a schematic diagram of a method 1200 for determining a modulation mode provided in an embodiment of the present application. Referring to FIG12 , the method 1200 may include the following steps:

S1201, the network device sends first information to the terminal device according to its own capability configuration, or according to its own capability configuration and the modulation parameters of the terminal device. The first information can be used to indicate whether the network device supports OQAM or the conditional parameters of the supported OQAM configured for the terminal device.

Specifically, the network device can configure whether the terminal device supports OQAM or the conditional parameters of supported OQAM based on its own capability configuration, or based on its own capability configuration and the modulation parameters of the terminal device reported to the network device by the terminal device, and send first information to the terminal device. The first information can be used to indicate information such as whether the network device configured by the network device to the terminal device supports OQAM or the conditional parameters of supported OQAM.

Optionally, the modulation parameters of the terminal device may be sent by the terminal device to the network device; or, the modulation parameters of the terminal device may be determined by the network device based on other information sent by the terminal device, which is not limited in this embodiment of the present application.

Exemplarily, before the above step S1201, the terminal device may send the modulation parameter to the network device.

S1202: The network device communicates with the terminal device.

Specifically, the network device may schedule communication resources to communicate with the terminal device.

Optionally, before step S1202, the method may further include the terminal device receiving transmission resource indication information, where the transmission resource indication information may be used to indicate a time-frequency resource on which the terminal device may receive the transmission data stream. The transmission resource indication information indicates the time-frequency resource on which the network device sends the transmission data stream, thereby enabling the terminal device to receive the transmission data stream on the time-frequency resource.

S1203: Determine a modulation mode according to communication parameters and/or information such as whether OQAM is supported.

Specifically, after the network device communicates with the terminal device, the network device can determine the modulation mode based on communication parameters and/or whether the network device supports OQAM and other information, and send second information to the terminal device, where the second information is used to indicate the modulation mode determined by the network device.

It is understandable that, in step S1203 above, after the network device communicates with the terminal device, the terminal device may determine the modulation mode based on the communication parameters and/or information such as whether the network device supports OQAM, and send second information (not shown in FIG. 12 ) indicating the modulation mode determined by the terminal device to the network device. This embodiment of the present application is not limited to this.

S1204: Communicate according to the determined modulation method.

Based on the solution provided in the embodiments of the present application, the network device and the terminal device can flexibly determine the modulation mode according to the capabilities of the terminal device and/or the network device or the actual communication conditions (for example, communication resources, channel quality, etc.), and communicate according to the determined modulation mode.

It can be understood that the modulation mode determined in the above-mentioned method 1200 for determining the modulation mode may include the above-mentioned method 1100 for sending the signal, or other modulation modes, and the embodiments of the present application are not limited to this.

The above text describes in detail the signal sending method 1100 and the method 1200 for determining the modulation mode by the network device and the terminal device provided in an embodiment of the present application in combination with Figures 11 and 12. The following text introduces the communication device provided in an embodiment of the present application in combination with Figures 13 and 14.

Figure 13 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in Figure 13, the device 1300 can be a terminal device or a network device, or a component (e.g., a unit, module, chip, or chip system) configured in the terminal device or network device. The device 1300 can include a transceiver unit 1310 and a processing unit 1320.

The transceiver unit 1310 may be configured to perform the transceiver-related operations performed by the terminal device or network device in the above method embodiments. For example, the transceiver unit 1310 may be configured to transmit or receive a second modulated signal, or to transmit or receive a real signal and/or an imaginary signal, or to transmit or receive a pilot symbol, or to transmit or receive the first information or the second information.

The processing unit 1320 can be used to perform the processing-related operations performed by the terminal device or network device in the above method embodiments. For example, the processing unit 1320 can be used to modulate the to-be-modulated signal according to the first modulation method; or can be used to modulate the first modulated signal according to the second modulation method; or can be used to demodulate the second modulated signal according to the first coefficient A.

Figure 14 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in Figure 14, the device 1400 may include a processor 1410 and a transceiver 1430. The device 1400 may also include a memory 1420, which stores one or more programs. When the one or more programs are executed by the processor 1410, the signal transmission or signal reception method described in any possible implementation manner described above is executed.

For example, the apparatus 1400 may be used to execute the aforementioned method 1100 , method 1200 , etc.

It is understood that, in the apparatus of FIG14 , the processor 1410 may include one or more processors, the memory 1420 may include one or more memories, and the transceiver 1430 may include one or more transceivers, which are not limited in this embodiment of the present application.

An embodiment of the present application also provides a chip, which includes a processor and a communication interface, wherein the communication interface is used to receive a signal and transmit the signal to the processor, and the processor processes the signal so that the method of signal sending or signal receiving described in any possible implementation method described above is executed.

This embodiment also provides a computer storage medium, which stores computer instructions. When the computer instructions are executed on an electronic device, the electronic device executes the above-mentioned related method steps to implement the signal sending or signal receiving method in the above-mentioned embodiment.

This embodiment further provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement the signal sending or signal receiving method in the above-mentioned embodiment.

In addition, an embodiment of the present application also provides a device, which can specifically be a chip, component or module, and the device may include a connected processor and memory; wherein the memory is used to store computer-executable instructions, and when the device is running, the processor can execute the computer-executable instructions stored in the memory to enable the chip to execute the signal sending or signal receiving method in the above-mentioned method embodiments.

Among them, the electronic device, computer storage medium, computer program product or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and other media that can store program codes.

The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims (29)

A signal transmission method, characterized in that the method comprises: modulating the signal to be modulated according to a first modulation method to obtain a first modulated signal, wherein the first modulation method includes modulating the amplitude of the signal to be modulated; Modulating the plurality of first modulated signals according to a second modulation mode to obtain m second modulated signals, wherein the second modulation mode includes phase modulation, the second modulated signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulated signals satisfy: a phase difference Q between any two adjacent second modulated signals in the time domain satisfies: Q=n*π/2, or Q=-n*π/2, where n is an integer greater than or equal to 1; The second modulated signal is sent. The method according to claim 1, wherein modulating the plurality of first modulated signals according to a second modulation mode to obtain m second modulated signals further comprises: The amplitude of the first modulated signal is modulated according to a first coefficient A, wherein the first coefficient A is related to at least any one of the following: Roll-off factor α, or, spectrum spreading factor β. The method according to claim 2, wherein sending the second modulated signal comprises: The second modulated signal and pilot symbols are sent within the same time unit, the pilot symbols include frequency domain sequences that have not been processed in the time domain, and the bandwidth for sending the pilot symbols is the same as the bandwidth for sending the second modulated signal. The method according to claim 3, characterized in that The frequency domain sequence includes a constant modulus sequence. The method according to any one of claims 2 to 4, characterized in that The first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A=1-β. The method according to any one of claims 1 to 5, wherein the phase modulation comprises at least any one of the following: modulating the first modulation signal according to a common phase rotation; or, The first modulation signal is modulated according to a rotation phase value. The method according to any one of claims 1 to 6, wherein the second modulated signal satisfies the following conditions:
Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value. The method according to claim 7, characterized in that The value B of the PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1. The method according to claim 7 or 8, characterized in that The Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, and a is a number greater than or equal to 0. The method according to any one of claims 7 to 9, characterized in that The f(i) satisfies any of the following: f(i)=ni, or f(i)=-ni, or f(i)=n(i mod 4y+2), or f(i)=-n(i mod 4y+2), or f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function; The second modulation mode further includes modulating the amplitude of the first modulation signal according to the normalization coefficient, and the normalization coefficient C satisfies: Any of, or Any one of . The method according to claim 7, characterized in that b(i') represents the signal to be modulated corresponding to the first modulating signal, and i' represents the index of the signal to be modulated; When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,
or, When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,
or,
or, When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
A communication device, characterized in that the device comprises: a processing unit, configured to modulate the signal to be modulated according to a first modulation mode to obtain a first modulated signal, wherein the first modulation mode includes modulating the amplitude of the signal to be modulated; The processing unit is further configured to modulate the plurality of first modulated signals according to a second modulation mode to obtain m second modulated signals, wherein the second modulation mode includes phase modulation, the second modulated signal is a complex signal, m is an integer greater than or equal to 2, and the m second modulated signals satisfy that a phase difference Q between any two adjacent second modulated signals in the time domain satisfies: Q=n*π/2, or Q=-n*π/2, where n is an integer greater than or equal to 1; A transceiver unit is used to send the second modulated signal. The apparatus according to claim 12, wherein the modulating the plurality of first modulated signals according to the second modulation mode to obtain m second modulated signals further comprises: The amplitude of the first modulated signal is modulated according to a first coefficient A, wherein the first coefficient A is related to at least any one of the following: Roll-off factor α, or, spectrum spreading factor β. The apparatus according to claim 13, wherein sending the second modulated signal comprises: The second modulated signal and pilot symbols are sent within the same time unit, the pilot symbols include frequency domain sequences that have not been processed in the time domain, and the bandwidth for sending the pilot symbols is the same as the bandwidth for sending the second modulated signal. The device according to claim 14, characterized in that The frequency domain sequence includes a constant modulus sequence. The device according to any one of claims 13 to 15, characterized in that The first coefficient A satisfies: A=α+1, or A=1/(1-β), or A=1/(α+1), or A= 1-β. The device according to any one of claims 12 to 16, wherein the phase modulation comprises at least any one of the following: modulating the first modulation signal according to a common phase rotation; or, The first modulation signal is modulated according to a rotation phase value. The apparatus according to any one of claims 12 to 17, wherein the second modulated signal satisfies the following conditions:
Wherein, i represents the index of the second modulation signal, d(i) represents the second modulation signal, C represents the normalization coefficient, f(i) represents the rotation phase value, PAM_signal represents the first modulation signal, and Com_Phase_Rot represents the common rotation phase value. The device according to claim 18, characterized in that The value B of the PAM_signal represents the energy level corresponding to the first modulated signal, and B satisfies any one of: B∈{1; -1; 3; -3; ...; (2x-1); -(2x-1)}, where x is an integer greater than or equal to 1. The device according to claim 18 or 19, characterized in that The Com_Phase_Rot satisfies: Com_Phase_Rot=e ^jθ , θ=aπ/4, and a is a number greater than or equal to 0. The device according to any one of claims 18 to 20, characterized in that The f(i) satisfies any of the following: f(i)=ni, or f(i)=-ni, or f(i)=n(i mod 4y+2), or f(i)=-n(i mod 4y+2), or f(i)=n(i mod 4y), or f(i)=-n(i mod 4y), where y is an integer greater than or equal to 0, and mod represents a modulo function; The second modulation mode further includes modulating the amplitude of the first modulation signal according to the normalization coefficient, and the normalization coefficient C satisfies: Any of, or Any one of . The device according to claim 18, characterized in that b(i') represents the signal to be modulated corresponding to the first modulating signal, and i' represents the index of the signal to be modulated; When i' satisfies: i'=i, the second modulated signal satisfies the following conditions:
or,
or, When i' satisfies any of the following: i'=2i, or i'=2i+1, the second modulated signal satisfies the following conditions:
or,
or,
or,
or, When i' satisfies any of the following: i'=3i, or i'=3i+1, or i'=3i+2, the second modulated signal satisfies the following conditions:
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
or,
The device according to any one of claims 12 to 22, characterized in that The transceiver unit is a transceiver, and/or the processing unit is a processor. A communication device, comprising: A processor, configured to execute computer instructions stored in the memory, so that the apparatus performs: the method according to any one of claims 1 to 11. The device according to claim 24, characterized in that the device also includes the memory. The device according to claim 24 or 25, characterized in that the device further comprises a communication interface, wherein the communication interface is coupled to the processor, The communication interface is used to input and/or output information. The device according to any one of claims 24 to 26, wherein the device is a chip. A computer program product, characterized in that when a computer program in the computer program product is executed by a communication device, the method according to any one of claims 1 to 11 is implemented. A computer-readable storage medium, characterized in that a computer program or instruction is stored in the storage medium, and when the computer program or instruction is executed by a communication device, the method according to any one of claims 1 to 11 is implemented.