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WO2024261899A1 - Émetteur, récepteur, procédé d'émissioin, procédé de réception, circuit de commande et support de stockage de programme - Google Patents

Émetteur, récepteur, procédé d'émissioin, procédé de réception, circuit de commande et support de stockage de programme Download PDF

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Publication number
WO2024261899A1
WO2024261899A1 PCT/JP2023/022921 JP2023022921W WO2024261899A1 WO 2024261899 A1 WO2024261899 A1 WO 2024261899A1 JP 2023022921 W JP2023022921 W JP 2023022921W WO 2024261899 A1 WO2024261899 A1 WO 2024261899A1
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WO
WIPO (PCT)
Prior art keywords
signal
spectrum
interference
information
symbol
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Pending
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PCT/JP2023/022921
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English (en)
Japanese (ja)
Inventor
匡平 天野
亮介 中村
昭範 中島
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to PCT/JP2023/022921 priority Critical patent/WO2024261899A1/fr
Priority to JP2024574021A priority patent/JP7638466B1/ja
Priority to TW112143796A priority patent/TW202502017A/zh
Publication of WO2024261899A1 publication Critical patent/WO2024261899A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits

Definitions

  • This disclosure relates to a transmitter, a receiver, a transmission method, a reception method, a control circuit, and a program storage medium.
  • Unlicensed bands such as the ISM (Industry-Science-Medical) band used in wireless standards such as wireless LAN (Local Area Network) and Bluetooth (registered trademark) are widely used in various systems because no license is required for wireless communication. Since communication devices that use unlicensed bands are installed in various indoor and outdoor locations, including offices and train stations, if the communication device uses the same frequency band as that used by other communication devices, the signals of other systems, including the other communication devices, can cause significant interference to the system that includes the communication device. Therefore, interference resistance is an important technology for stable communication using unlicensed bands.
  • Interference avoidance technology is a technology that improves interference resistance by using channels that are less susceptible to interference, and is a technology that switches the frequency channel used by a wireless system to a channel that is less susceptible to interference by measuring the degree of interference in advance or by detecting interference collisions.
  • Patent Document 1 discloses a method in which a wireless system measures and evaluates the interference situation of each channel that it can use, and determines a channel that is less susceptible to interference as a channel that the system will use preferentially.
  • Patent Document 2 discloses a method of providing a processing circuit for measuring the interference status of channels that can be used by a wireless system in the 5 GHz band, separate from the processing circuit for communications, so that when a signal from another system is detected on a channel being used for communications, the channel to be used for communications is switched to a channel that has been preliminarily evaluated by the processing circuit for measuring the interference status as having less interference.
  • the probability of interference collisions can be reduced, and therefore the interference avoidance technology can improve the interference resistance of wireless systems.
  • the interference avoidance technology can improve the interference resistance of wireless systems.
  • interference collisions can still occur even if interference avoidance technology is applied, and when an interference collision occurs, the received packet that has been affected by the interference cannot be demodulated due to the effects of the interference.
  • the present disclosure has been made in consideration of the above, and aims to obtain a transmitter that can transmit a signal that allows demodulation even in the event of interference collision.
  • the transmitter disclosed herein has a frequency repetition modulation unit that generates a transmission spectrum in which the spectrum of the modulated signal is continuously arranged on the frequency axis, the same transmission symbol is arranged at regular subcarrier intervals in the spectrum of the modulated signal, and the spectrum on the high-band side and the spectrum on the low-band side are equal to the center frequency, thereby generating a signal in which information symbols with a non-zero time domain signal and null symbols with a zero time domain signal appear periodically.
  • the transmitter disclosed herein has the advantage of being able to transmit a signal that allows demodulation even in the event of interference collisions.
  • FIG. 1 shows a configuration of a wireless system according to an embodiment.
  • FIG. 1 is a diagram showing a configuration of a transmitter according to an embodiment
  • FIG. 13 is a diagram showing an example of a time waveform of a transmission signal when sampling is performed for each symbol time.
  • FIG. 1 shows a configuration of a receiver according to an embodiment.
  • FIG. 2 is a diagram showing the configuration of a reception quality measurement unit included in a receiver according to an embodiment;
  • FIG. 1 is a diagram showing an image of processing by a signal separation unit included in a reception quality measurement unit of a receiver according to an embodiment;
  • FIG. 1 is a diagram for explaining the operation of an interference information estimation unit included in a reception quality measurement unit of a receiver according to an embodiment.
  • FIG. 1 is a diagram showing a configuration of a transmitter according to an embodiment
  • FIG. 13 is a diagram showing an example of a time waveform of a transmission signal when sampling is performed for each symbol time.
  • FIG. 1 shows a configuration of
  • FIG. 8 is a diagram showing frequency spectrum characteristics in the interference arrival pattern of FIG. 7 .
  • Image of average power FIG. 1 is a diagram showing a configuration of a frequency repetition synthesis selection unit included in a receiver according to an embodiment;
  • FIG. 1 is a diagram showing a processing circuit in the case where the functions of a transmitter and a receiver according to an embodiment are realized by the processing circuit;
  • FIG. 2 is a diagram showing a control circuit for controlling the operation of a transmitter according to an embodiment;
  • FIG. 1 is a diagram showing a program storage medium storing a program for controlling a transmitter according to an embodiment.
  • Embodiment 1 is a diagram showing a configuration of a wireless system according to an embodiment of the present invention.
  • the wireless system according to the embodiment includes a transmitter 1 and a receiver 2.
  • FIG. 2 is a diagram showing the configuration of a transmitter 1 according to an embodiment.
  • the transmitter 1 has a frequency repetition modulation unit 18 including a modulation unit 11, a frequency repetition unit 12, and an IFFT (Inverse Fast Fourier Transform) unit 13, a CP (Cyclic Prefix) addition unit 14, a transmission filter unit 15, a transmission RF (Radio Frequency) unit 16, and a transmission antenna 17.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • transmission filter unit 15
  • RF Radio Frequency
  • the modulation unit 11 performs an Orthogonal Frequency Division Multiplexing (OFDM) modulation process on the data sequence to be transmitted.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the number of subcarriers in the OFDM signal is N.
  • the OFDM modulated signal spectrum s is expressed by the following formula (1).
  • the output of the modulation unit 11 as expressed by formula (1), that is, the OFDM modulated signal spectrum, is called the reference spectrum.
  • the frequency repetition unit 12 performs frequency repetition processing on the reference spectrum generated by the modulation unit 11.
  • the procedure of processing performed by the frequency repetition unit 12 is shown below. If the number of repetitions is M, the frequency repetition unit 12 executes frequency repetition processing so that M consecutive reference spectra are lined up in frequency, as shown in the following formula (2). At this time, in the placement processing of each subcarrier performed by the frequency repetition unit 12, each subcarrier is placed so that the same symbol is assigned every N subcarrier interval, as shown in formula (2).
  • the bandwidth after repetition processing is expanded to M times the bandwidth of the reference spectrum.
  • the output of the frequency repetition unit 12 is referred to as the transmission spectrum.
  • the IFFT unit 13 performs an inverse fast Fourier transform on the transmission spectrum and outputs one block of a time-domain transmission signal.
  • the following equation (3) represents one block of the transmission signal after the inverse fast Fourier transform has been performed.
  • xn is a transmission symbol at discrete time index n.
  • the discrete time index is called symbol time.
  • FIG. 3 is a diagram showing an example of the time waveform of a transmission signal when sampling is performed at every symbol time. As shown in FIG. 3, the time waveform of the transmission signal has a non-zero pulse appearing at every M symbol times, and is null at other symbol times. At the null, both the I value and the Q value are 0.
  • a transmission symbol where xn is non-zero is called an information symbol
  • a transmission symbol where xn is null is called a null symbol.
  • the CP addition unit 14 adds a predetermined sample at the end of one block of the transmission signal converted to the time domain to the beginning of the time domain transmission signal as a guard interval.
  • the transmission filter unit 15 performs filtering on the signal obtained by the CP addition unit 14 and outputs the generated transmission signal data to the transmission RF unit 16.
  • the transmitting RF unit 16 performs digital to analog (DA) conversion on the generated transmission signal data, converts the baseband signal to a carrier frequency, amplifies the signal, and then outputs the signal to the transmitting antenna 17.
  • DA digital to analog
  • the transmitting antenna 17 radiates the signal from the transmitting RF unit 16 into the air.
  • the frequency repetition unit 12 generates a transmission spectrum in which the spectrum of the modulated signal is arranged continuously on the frequency axis, the same transmission symbol is arranged at regular subcarrier intervals in the spectrum of the modulated signal, and the spectrum on the high-band side and the spectrum on the low-band side with respect to the center frequency are equal.
  • the IFFT unit 13 converts the transmission spectrum generated by the frequency repetition unit 12 into a time-domain signal, and generates and transmits a signal in which information symbols, where the time-domain signal is non-zero, and null symbols, where the time-domain signal is zero, appear periodically.
  • FIG. 4 is a diagram showing the configuration of a receiver 2 according to an embodiment.
  • the receiver 2 has a receiving antenna 21, a receiving RF unit 22, a receiving filter unit 23, a CP removal unit 24, a receiving quality measurement unit 25, an FFT (Fast Fourier Transformation) unit 26, a frequency repetition synthesis selection unit 27, and a demodulation unit 28.
  • FFT Fast Fourier Transformation
  • the receiver 2 has one receiving antenna 21, and receives radio waves radiated from the transmitter 1 by the receiving antenna 21.
  • the number of receiving antennas 21 is one, but the number of receiving antennas 21 is not limited to one, and the receiver 2 may have multiple receiving antennas 21.
  • the subsequent processing may be performed for each signal received by each of the multiple receiving antennas 21, or the multiple signals received by the multiple receiving antennas 21 may be combined and then the subsequent processing may be performed.
  • the receiving RF unit 22 adjusts the gain of the signal received by the receiving antenna 21, converts the gain-adjusted signal into a baseband signal, and then performs AD conversion.
  • the receiving filter unit 23 performs filtering on the AD-converted signal.
  • the CP removal unit 24 removes the guard interval from the receiving signal processed by the receiving filter unit 23.
  • Equation (4) shows one block of the time domain received signal after CP removal by the CP removal unit 24.
  • the received signal from which the guard interval has been removed by the CP removal unit 24 is output to the reception quality measurement unit 25 and the FFT unit 26.
  • FIG. 5 is a diagram showing the configuration of the reception quality measurement unit 25 of the receiver 2 according to the embodiment.
  • the reception quality measurement unit 25 has a signal separation unit 251, an interference information estimation unit 252, an information section estimation unit 253, and a reception quality information integration unit 254.
  • the signal separation unit 251 separates information symbols and null symbols in one block of the received signal to measure the features of the information symbols and the features of the interference signals.
  • the features are information on power, phase, and amplitude. The detailed operation will be described below.
  • the signal separation unit 251 extracts the information symbol measurement section and the interference signal measurement section by taking into account the influence of multipath on the communication path and the like, and the null symbols of the last several symbols of each information symbol in one block of the received signal after interference suppression, and by taking the remaining null symbols as the interference signal measurement section.
  • the signal separation unit 251 outputs the extracted symbols corresponding to the information symbol measurement section to the information section estimation unit 253, and outputs the extracted symbols corresponding to the interference signal measurement section to the interference information estimation unit 252.
  • each information symbol and the following two null symbols are extracted from the received signal after CP removal as the information symbol measurement section, and the other null symbols are extracted as the interference signal measurement section.
  • the interference information estimation unit 252 estimates the features of the interference signal using the interference signal measurement section, and estimates whether there is any change in the interference arrival pattern.
  • FIG. 7 is a diagram for explaining the operation of the interference information estimation unit 252 in the reception quality measurement unit 25 of the receiver 2 according to the embodiment. The detailed operation of the interference information estimation unit 252 is shown in the following (i) to (iv) using as an example the case where interference A and interference B as shown in FIG. 7 arrive at different times.
  • FIG. 8 is a diagram showing the frequency spectrum characteristics in the interference arrival pattern of FIG. 7.
  • the interference information estimation unit 252 further divides the interference signal measurement section of one block of the received signal to measure the interference characteristics.
  • the interference information estimation unit 252 divides the interference signal measurement section of one block of the received signal into a first interference signal measurement section through an eighth interference signal measurement section every M symbol time, and estimates the average value of the interference signal characteristics in each section.
  • the interference information estimation unit 252 estimates whether there is a change in the interference situation.
  • the interference information estimation unit 252 judges whether there is a significant difference based on the difference in the feature amount of adjacent interference signal measurement sections to determine whether there is a change in the interference situation.
  • the average power of each measurement section is used as the feature amount, but the feature amount to be compared may be another feature amount such as phase.
  • the index used to determine the interference situation is the power difference, and the interference information estimation unit 252 determines that the interference situation has changed when the power difference is equal to or greater than a threshold.
  • the interference information estimation unit 252 compares the feature amounts in order from the earliest section.
  • the interference information estimation unit 252 determines that there is no change in the interference situation during the section in which the power difference is less than the threshold, and determines that the interference situation has changed during the section in which the power difference is equal to or greater than the threshold.
  • FIG. 9 is an image diagram of the average power. In the example of Fig. 9, when comparing the first section from the first interference signal measurement section to the fourth interference signal measurement section and the second section from the fifth interference signal measurement section to the eighth interference signal measurement section, the power difference is less than the threshold in both the first and second sections, so it is determined that the interference situation is the same. On the other hand, when comparing the fourth interference signal measurement section to the fifth interference signal measurement section, the power difference is greater than or equal to the threshold, so it is determined that the interference situation has changed.
  • P A means the average power value of the first and second interference signal measurement sections
  • P B means the average power value of the third and fourth interference signal measurement sections
  • P C means the average power value of the fifth and sixth interference signal measurement sections
  • P D means the average power value of the seventh and eighth interference signal measurement sections.
  • the interference information estimation unit 252 estimates the feature amount of each interference pattern.
  • the interference information estimation unit 252 estimates the average feature amount of all interference signal measurement sections in which it is determined that the same interference has arrived.
  • the interference information estimation unit 252 estimates the average feature amount for the first interference pattern using an interference signal measurement section with a symbol time of 0 to 4M, and estimates the average feature amount for the second interference pattern using an interference signal measurement section with a symbol time of 4M to 8M.
  • the interference information estimation unit 252 After estimating the average feature value of each interference pattern, the interference information estimation unit 252 outputs information indicating the average feature value of each interference pattern and the interval of each interference pattern to the information interval estimation unit 253 and the reception quality information integration unit 254.
  • the information interval estimation unit 253 measures the average power of the information symbols from the information symbol measurement interval.
  • the information interval estimation unit 253 measures the average power of the information symbols assigned to the corresponding interval for each interference pattern notified by the interference information estimation unit 252. For example, in FIG. 6, if it is determined that the interference measurement interval from symbol time 3 to symbol time M-1 and the interference measurement interval from symbol time M+3 to symbol time 2M-1 have the same interference pattern, the information interval estimation unit 253 measures the average power using the information symbols corresponding to each interference measurement interval, that is, the information symbols at symbol time 0 and symbol time M. The information interval estimation unit 253 performs this process on the information symbols corresponding to all interference patterns estimated within one block of the received signal after interference suppression.
  • the reception quality information integration unit 254 aggregates the interference information measured by the interference information estimation unit 252 and the information symbol information measured by the information interval estimation unit 253, and notifies the subsequent module of the aggregated information.
  • the reception quality information integration unit 254 judges the reception quality of the interference-suppressed received signal based on the interference measured by the interference information estimation unit 252 and the average power of the information symbol measured by the information interval estimation unit 253. In the embodiment, the reception quality information integration unit 254 judges the reception quality by comparing the average power of the information symbol and the average power of the interference signal for each interference arrival pattern measured by the interference information estimation unit 252.
  • reception quality judgment method in the embodiment will be shown below, where the average power of the information symbol in a certain interference arrival pattern is Pd and the average power of the interference signal is Pi .
  • the reception quality information integration unit 254 judges "reception quality: high". "Reception quality: high” means that the reception quality is relatively good.
  • the power of the interference signal becomes equal to or greater than the average power of the information symbol.
  • the reception quality information integrating unit 254 judges the reception quality as "low". "Reception quality: low” means that the reception quality is relatively poor. After completing the reception quality judgment, the reception quality information integrating unit 254 outputs interference information, information symbol information, and reception quality information to a subsequent module.
  • the FFT unit 26 performs a fast Fourier transform on one block of the received signal, converts the one block of the received signal into a frequency domain signal, and outputs the signal.
  • the received symbol after interference suppression of the k-th subcarrier after the fast Fourier transform process is denoted as r k , and the signal after the fast Fourier transform is shown in the following equation (5).
  • the received signal converted into a frequency domain signal is called the received signal spectrum.
  • FIG. 10 is a diagram showing the configuration of the frequency repetition synthesis selection unit 27 of the receiver 2 according to the embodiment.
  • the frequency repetition synthesis selection unit 27 has a subcarrier selection unit 271 and a repetition synthesis unit 272.
  • the frequency repetition synthesis selection unit 27 performs a repetition synthesis process that synthesizes spectra that are consecutively arranged in frequency by frequency repetition processing.
  • the frequency repetition synthesis selection unit 27 performs weighting taking into account the amount of interference of each subcarrier before synthesizing in order to reduce the influence of interference signals.
  • the subcarrier selection unit 271 determines the weight of each subcarrier when performing frequency repetition synthesis processing.
  • a process flow for determining the weight of the subcarrier during repetition synthesis using the reception quality information measured by the reception quality measurement unit 25 in the case of FIG. 8 is shown.
  • the reception quality information in each interference pattern measured by the reception quality measurement unit 25 is both determined to be "reception quality: low”. If there is even one signal determined to be "reception quality: low" in the measured interference pattern, the subcarrier selection unit 271 searches for whether interference is concentrated in any subcarrier in the received signal spectrum.
  • the subcarrier selection unit 271 compares the average power of all subcarriers with the power of each subcarrier, and if the power of a certain subcarrier is greater than the average power by a certain amount or more, it determines that interference exists in that certain subcarrier. In the example of FIG. 8, the power of the subcarrier where only interference B exists and the power of the subcarrier where both interference A and interference B exist are greater than the average power, so the subcarrier selection unit 271 determines that both the subcarrier where only interference B exists and the subcarrier where both interference A and interference B exist are subcarriers where interference exists.
  • the subcarrier selection unit 271 determines the weight of each subcarrier. For subcarriers determined to have interference, the subcarrier selection unit 271 determines the weight at the time of combining corresponding to the difference between the power of the subcarrier determined to have interference and the average power. In the example of FIG. 8, the subcarrier selection unit 271 determines the weight of the subcarrier where only interference B exists and the weight of the subcarrier where both interference A and interference B exist to be relatively small, and determines the weight of the subcarrier determined to have no interference to be relatively large. Note that in the embodiment, when it is determined that "reception quality: high", no search for interference is performed, and the subcarrier selection unit 271 sets all the weights at the time of combining to be the same. After determining the weights of all subcarriers, the subcarrier selection unit 271 outputs the weight of each subcarrier to the repetition combination unit 272.
  • the repetition synthesis unit 272 performs a repetition synthesis process that synthesizes spectra that are consecutively arranged in frequency by frequency repetition processing. At this time, the repetition synthesis unit 272 performs weighting using the weight obtained by the subcarrier selection unit 271 and then performs synthesis processing. Since the same transmission symbol is arranged at every N subcarrier interval in the signal that has been subjected to frequency repetition processing according to equation (2), the repetition synthesis unit 272 synthesizes the same symbols when performing frequency repetition synthesis processing. In other words, the repetition synthesis unit 272 synthesizes the reception symbols at every N subcarrier interval. If the weight of the k-th subcarrier in the reception signal spectrum before synthesis is v k , the reception symbol R w in the w-th subcarrier after repetition synthesis is expressed by the following equation (6).
  • the output of the repetition synthesis unit 272 is called the reception spectrum after repetition synthesis.
  • the number of subcarriers in the reception spectrum after repetition synthesis is N
  • the bandwidth of the reception spectrum after repetition synthesis is the same as the bandwidth of the reference spectrum.
  • the demodulation unit 28 performs demodulation processing on the received spectrum after repetition synthesis, and outputs the demodulated bits to the subsequent higher-level device.
  • the receiver 2 has a frequency repetition synthesis selection unit 27 that performs a frequency repetition synthesis process for generating one spectrum by synthesizing subcarriers containing the same symbol information for a received signal in which the same spectrum is arranged consecutively.
  • the frequency repetition synthesis selection unit 27 adjusts the synthesis amount of each subcarrier by weighting the subcarriers when synthesizing them in accordance with the reception status of the received signal.
  • the reception quality measurement unit 25 extracts null symbols in any interval from the received signal, divides the extracted null symbols into intervals consisting of any number of null symbols, estimates the feature amount of the interference signal in each interval, compares the feature amounts of adjacent intervals to determine the change in the arrival status of the interference signal, and estimates the feature amount of the interference signal for each arrival status of the interference signal using the null symbol corresponding to the determined arrival status of the interference signal.
  • the reception quality measurement unit 25 extracts information symbols from the received signal in any interval, estimates the characteristics of the information symbols using the extracted information symbols, and observes and evaluates the reception status using the characteristics of the estimated information symbols and the characteristics of the interference signal.
  • transmitter 1 transmits a signal having such a characteristic that null symbols appear in the time domain signal by performing frequency repetition processing on the modulated signal.
  • transmitter 1 can transmit a signal that allows demodulation even in the event of interference collision.
  • Receiver 2 can enable demodulation even in the event of interference collision by measuring the interference situation using the characteristics of the received signal and performing spectrum synthesis processing with weighting corresponding to the interference situation. In other words, receiver 2 can demodulate the received signal even in the event of interference collision.
  • Each component of the transmitter 1 and the receiver 2 is realized by a processing circuit.
  • the processing circuit may be realized by a dedicated circuit or a control circuit using a CPU.
  • each of the transmitter 1 and the receiver 2 has a processing circuit 30 shown in FIG. 11, and the functions of each of the transmitter 1 and the receiver 2 are realized by the processing circuit 30.
  • FIG. 11 is a diagram showing the processing circuit 30 when the functions of each of the transmitter 1 and the receiver 2 according to the embodiment are realized by the processing circuit 30.
  • the processing circuit 30 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination of these.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • each of the transmitter 1 and receiver 2 has a CPU 31 and memory 32 as shown in FIG. 12, and each function of the transmitter 1 and receiver 2 is described as a program, and the program is stored in the memory 32.
  • the CPU 31 realizes the function corresponding to the program by reading and executing the program stored in the memory 32.
  • FIG. 12 is a diagram showing the CPU 31 when each function of the transmitter 1 and receiver 2 in the embodiment is realized by the CPU 31.
  • the CPU 31 may be replaced with a processing system, an arithmetic system, a microprocessor, or a DSP (Digital Signal Processor).
  • the memory 32 may be, for example, a non-volatile or volatile semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM (registered trademark)), a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a digital versatile disk (DVD).
  • RAM random access memory
  • ROM read only memory
  • EPROM erasable programmable read only memory
  • EEPROM electrically erasable programmable read-only memory
  • EEPROM registered trademark
  • the control circuit 33 causes the transmitter 1 to perform an operation of generating a transmission spectrum in which the spectrum of the modulated signal is arranged continuously on the frequency axis, the same transmission symbol is arranged at regular subcarrier intervals in the spectrum of the modulated signal, and the spectrum on the high band side and the spectrum on the low band side are equal to the center frequency, and an operation of transmitting a signal in which information symbols whose time domain signals are non-zero and null symbols whose time domain signals are zero appear periodically based on the generated transmission spectrum.
  • the operation of the receiver 2 according to the embodiment may also be controlled by a control circuit equivalent to the control circuit 33.
  • the control circuit that controls the operation of the receiver 2 causes the receiver 2 to perform an operation of frequency repetition synthesis processing for synthesizing subcarriers containing the same symbol information to generate one spectrum for a received signal in which the same spectrum is arranged continuously, and an operation of adjusting the synthesis amount of each subcarrier by weighting when synthesizing each subcarrier in response to the reception status of the received signal when performing frequency repetition synthesis processing.
  • FIG. 14 is a diagram showing a program storage medium 34 that stores a program for controlling the transmitter 1 according to the embodiment.
  • the program causes the transmitter 1 to execute an operation of generating a signal in which the spectrum of the modulated signal is continuously arranged on the frequency axis, the same transmission symbol is arranged at a constant subcarrier interval in the spectrum of the modulated signal, and the spectrum on the high band side and the spectrum on the low band side are equal to the center frequency, thereby generating a signal in which information symbols in which the signal in the time domain is non-zero and null symbols in which the signal in the time domain is zero appear periodically.
  • the receiver 2 according to the embodiment may also be controlled by a program stored in a program storage medium equivalent to the program storage medium 34.
  • the program causes the receiver 2 to execute an operation of frequency repetition synthesis processing for synthesizing subcarriers containing the same symbol information to generate one spectrum for a received signal in which the same spectrum is continuously arranged, and an operation of adjusting the amount of synthesis of each subcarrier by weighting when synthesizing each subcarrier in response to the reception status of the received signal when performing the frequency repetition synthesis processing.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un émetteur (1) comprend une unité de modulation de répétition de fréquence (18) qui génère un signal dans lequel un symbole d'information auquel un signal dans le domaine temporel devient non nul et un symbole nul auquel un signal dans le domaine temporel devient nul apparaissent périodiquement, par génération d'un spectre de transmission dans lequel : le spectre d'un signal modulé est disposé en continu sur l'axe de fréquence ; le même symbole de transmission est agencé à un intervalle de sous-porteuse prédéterminé par rapport au spectre du signal modulé ; et le spectre sur le côté bande haute de la fréquence centrale est égal au spectre sur le côté bande basse de la fréquence centrale.
PCT/JP2023/022921 2023-06-21 2023-06-21 Émetteur, récepteur, procédé d'émissioin, procédé de réception, circuit de commande et support de stockage de programme Pending WO2024261899A1 (fr)

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PCT/JP2023/022921 WO2024261899A1 (fr) 2023-06-21 2023-06-21 Émetteur, récepteur, procédé d'émissioin, procédé de réception, circuit de commande et support de stockage de programme
JP2024574021A JP7638466B1 (ja) 2023-06-21 2023-06-21 受信機及び受信方法
TW112143796A TW202502017A (zh) 2023-06-21 2023-11-14 發射器、接收器、發射方法、接收方法、控制電路以及程式儲存媒體

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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WO2020183544A1 (fr) * 2019-03-08 2020-09-17 三菱電機株式会社 Dispositif de réception, système de communication sans fil et procédé d'estimation de puissance d'interférence

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007032491A1 (fr) * 2005-09-16 2007-03-22 Matsushita Electric Industrial Co., Ltd. Dispositif d’émission radio, dispositif de réception radio, méthode d’émission radio et méthode de réception radio
WO2020183544A1 (fr) * 2019-03-08 2020-09-17 三菱電機株式会社 Dispositif de réception, système de communication sans fil et procédé d'estimation de puissance d'interférence

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