CN111313948B - A signal transmission method, device and electronic device - Google Patents

Abstract

Embodiments of the present invention provide a signal transmission method, device, and electronic equipment. The above method includes: performing quadrature amplitude modulation on a bit information stream to be transmitted to obtain a symbol vector to be encoded; Satisfied relational expression, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, the relational expression is: the relationship between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix Formula; use the target disturbance vector to precode the to-be-coded symbol vector to obtain the to-be-sent signal; send the to-be-sent signal. By adopting the method provided by the embodiment of the present invention, all the energy of the transmitting end can be used to transmit valid signals, without the need to transmit artificial noise unrelated to the effective signal; further, the signal sent by the transmitting end when received by the receiving end no longer contains artificial noise , to improve the performance of the receiving end to receive valid signals.

Description

A signal transmission method, device and electronic device

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a signal transmission method, device and electronic device.

Background technique

In the field of wireless communication, due to the open nature of wireless channels, the security problem in wireless communication has received more and more attention. Among them, the physical layer security technology of wireless communication ensures the security of transmission based on the characteristics of the wireless channel.

The current physical layer security technology mainly includes the following aspects: on the one hand, it is the research of the security capacity from the perspective of information theory, such as the calculation of the security capacity in different scenarios; on the other hand, the design of the security scheme, such as combining physical layer security with Channel coding technology is combined, or physical layer security is combined with AN (Artificial Noise, artificial noise) technology. Among them, the theoretical security capacity can be obtained based on the channel coding technology, but limited by the complexity of implementation, the technology of realizing physical layer security through the channel coding technology is often difficult to implement. The artificial noise technology is to add an interference signal to the effective transmission signal, and by selecting a suitable interference signal, in the case of causing interference to eavesdroppers, normal communication of legitimate users can be realized, thereby realizing physical layer security.

However, in the artificial noise technology, since the transmitting end needs to allocate part of the energy to transmit artificial noise unrelated to the effective signal, to cause interference to eavesdroppers, therefore, in the actual communication system, the power allocated to artificial noise will be As a result, the energy of the valid signal received by the receiving end is weakened, and the performance of the receiving end receiving the valid signal is reduced.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a signal transmission method, apparatus, electronic device, and storage medium, so as to solve the problem of low performance of the receiving end receiving valid signals caused by the existing artificial noise technology.

In order to achieve the above object, an embodiment of the present invention provides a signal transmission method, which is applied to a transmitting end device, and the method includes:

Perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain the symbol vector to be encoded;

Based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, and the relational expression is: The relationship between the symbol vector and the disturbance vector established by the code parameters and the precoding matrix;

using the target disturbance vector and the precoding matrix to precode the to-be-coded symbol vector to obtain a to-be-sent signal;

The to-be-sent signal is sent.

Further, based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, including:

Using the following formula, determine the complex integer vector satisfying the following formula as the target complex integer vector l:

The target perturbation vector is obtained by multiplying the target complex integer vector by the sphere decoding parameter using the following formula:

p=τ _s l

Among them, the target complex integer vector l≠0, p represents the target disturbance vector, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, and _i represents the ith dimension of the vector , W represents the precoding matrix, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation point, Δ represents the difference between the modulation constellation points distance, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user.

Further, using the target disturbance vector and the precoding matrix to precode the to-be-coded symbol vector to obtain the to-be-sent signal, including:

Using the following formula, the target disturbance vector is used to precode the to-be-coded symbol vector to obtain the to-be-sent signal:

x表示待发送信号。where β is the power normalization constant,

x represents the signal to be sent.

In order to achieve the above purpose, an embodiment of the present invention also provides a signal transmission method, which is applied to a receiving end device, and the method includes:

Receive a signal sent by the transmitting end device, the signal is obtained by the transmitting end device using the target disturbance vector and the precoding matrix to precode the symbol vector to be encoded, and the relationship between the symbol vector to be encoded and the target disturbance vector satisfies The relational expression established in advance, the relational expression is: the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameter and the precoding matrix;

Using a complex modulo mode corresponding to the relational expression, performing a complex modulo operation on the received signal to obtain a signal to be demodulated;

The signal to be demodulated is demodulated to obtain the received bit information stream.

Further, the target disturbance vector is calculated by the following formula:

p=τ _s l

Among them, l represents the target complex integer vector, and l≠0, p represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, and c _max represents the modulation constellation point The maximum amplitude value of , Δ represents the distance between modulation constellation points, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user;

The target complex integer vector is calculated by the following formula:

Wherein, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix;

The complex modulo operation corresponding to the relational expression is used to perform a complex modulo operation on the received signal to obtain the signal to be demodulated, including:

Use the following formula to determine the signal to be demodulated:

表示待解调信号，β表示功率归一化常数，z表示接收端设备所接收到的信号，

为(βz)的实部，

为(βz)的虚部，

Λ表示与调制信号所对应的星座区域，τ_S表示球译码参数，τ表示标准参数，且τ_S与τ满足：τ_s＝τ+δ_τ，δ_τ表示额外偏移量，j为虚数单位。in,

represents the signal to be demodulated, β represents the power normalization constant, z represents the signal received by the receiving end device,

is the real part of (βz),

is the imaginary part of (βz),

Λ represents the constellation region corresponding to the modulated signal, τ _S represents the spherical decoding parameter, τ represents the standard parameter, and τ _S and τ satisfy: τ _s =τ+δ _τ , δ _τ represents the extra offset, and j is an imaginary number unit.

Further, the demodulation of the to-be-demodulated signal to obtain the received bit information stream includes:

Based on the relationship between the signal to be demodulated and the bit information stream, the following formula is used to demodulate the signal to be demodulated to obtain the received bit information stream:

为复高斯噪声向量，其元素分布满足

where u represents the received bit stream,

is a complex Gaussian noise vector whose element distribution satisfies

In order to achieve the above purpose, an embodiment of the present invention also provides a signal transmission apparatus, which is applied to a sending end device, and the apparatus includes:

The modulation module is used to perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain the symbol vector to be encoded;

The determining module is used to determine, based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, to determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, the relational expression is: the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix;

a precoding module, configured to perform precoding on the to-be-coded symbol vector by using the target disturbance vector and the pre-coding matrix to obtain a to-be-sent signal;

A signal sending module, configured to send the to-be-sent signal.

Further, the determining module is specifically used to adopt the following formula to determine the complex integer vector satisfying the following formula, as the target complex integer vector l:

The determining module is also specifically used for adopting the following formula to multiply the target complex integer vector by the sphere decoding parameter to obtain the target disturbance vector:

p=τ _s l

Among them, the target complex integer vector l≠0, p represents the target disturbance vector, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, and _i represents the ith dimension of the vector , W represents the precoding matrix, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation point, Δ represents the difference between the modulation constellation points distance, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user.

Further, the precoding module is specifically configured to use the following formula to perform precoding on the to-be-coded symbol vector by using the target disturbance vector and the pre-coding matrix to obtain the to-be-sent signal:

x表示待发送信号。where β is the power normalization constant,

x represents the signal to be sent.

In order to achieve the above purpose, an embodiment of the present invention also provides a signal transmission device, which is applied to a receiving end device, and the device includes:

The signal receiving module is used to receive the signal sent by the transmitting end device, the signal is obtained by the transmitting end device using the target disturbance vector and the precoding matrix to precode the symbol vector to be encoded, and the symbol vector to be encoded is the same as the symbol vector to be encoded. A pre-established relational expression is satisfied between the target disturbance vectors, and the relational expression is: the relational expression between the symbol vector and disturbance vector established based on the sphere decoding parameter and the precoding matrix;

a complex modulo module, configured to perform a complex modulo operation on the received signal by using a complex modulo manner corresponding to the relational expression to obtain a signal to be demodulated;

The demodulation module is used for demodulating the to-be-demodulated signal to obtain the received bit information stream.

Further, the target disturbance vector is calculated by the following formula:

p=τ _s l

Among them, l represents the target complex integer vector, and l≠0, p represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, and c _max represents the modulation constellation point The maximum amplitude value of , Δ represents the distance between modulation constellation points, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user;

The target complex integer vector is calculated by the following formula:

Wherein, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix;

The complex modulo module is specifically used to determine the signal to be demodulated by adopting the following formula:

表示待解调信号，β表示功率归一化常数，z表示接收端设备所接收到的信号，

为(βz)的实部，

为(βz)的虚部，

Λ表示与调制信号所对应的星座区域，τ_S表示球译码参数，τ表示标准参数，且τ_S与τ满足：τ_s＝τ+δ_τ，δ_τ表示额外偏移量，j为虚数单位。in,

represents the signal to be demodulated, β represents the power normalization constant, z represents the signal received by the receiving end device,

is the real part of (βz),

is the imaginary part of (βz),

Λ represents the constellation region corresponding to the modulated signal, τ _S represents the spherical decoding parameter, τ represents the standard parameter, and τ _S and τ satisfy: τ _s =τ+δ _τ , δ _τ represents the extra offset, and j is an imaginary number unit.

Further, the demodulation module is specifically configured to demodulate the to-be-demodulated signal based on the relational expression satisfied by the signal to be demodulated and the bit information stream, and to obtain the received bit information stream by using the following formula:

为复高斯噪声向量，其元素分布满足

where u represents the received bit stream,

is a complex Gaussian noise vector whose element distribution satisfies

In order to achieve the above object, an embodiment of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

memory for storing computer programs;

The processor is configured to implement any of the signal transmission method steps described above and applied to the sending end device when executing the program stored in the memory.

In order to achieve the above object, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any of the above-mentioned functions applied to the sending end device are implemented. a step of the signal transmission method.

In order to achieve the above object, an embodiment of the present invention also provides a computer program product including instructions, which, when running on a computer, enables the computer to execute any of the above signal transmission method steps applied to the sending end device.

In order to achieve the above object, an embodiment of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

memory for storing computer programs;

The processor is configured to implement any of the above signal transmission method steps applied to the receiving end device when executing the program stored in the memory.

In order to achieve the above object, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, any of the above-mentioned applications applied to the receiving end device is implemented. a step of the signal transmission method.

In order to achieve the above object, an embodiment of the present invention also provides a computer program product containing instructions, which, when running on a computer, enables the computer to execute any of the above signal transmission method steps applied to the receiving end device.

Beneficial effects of the embodiment of the present invention:

Using the method provided by the embodiment of the present invention, the relationship between the pre-established symbol vector and the perturbation vector that needs to be satisfied, and the perturbation vector that satisfies the relationship between the symbol vector to be encoded, are used as the target perturbation vector, and then After using the target disturbance vector to precode the to-be-coded symbol vector to obtain the to-be-sent signal, the to-be-sent vector can be sent directly, that is, the energy of the transmitting end can be used to transmit the valid signal without the need to transmit artificial noise unrelated to the valid signal; further, The signal sent by the transmitting end received by the receiving end does not contain artificial noise, thereby improving the performance of the receiving end in receiving valid signals. In addition, by adding a target disturbance vector at the transmitting end, the equivalent noise intensity of the receiving end can be effectively reduced, thereby further improving the performance of the receiving end receiving valid signals.

Of course, it is not necessary for any product or method of the present invention to achieve all of the advantages described above at the same time.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a flowchart of a signal transmission method provided by an embodiment of the present invention;

2 is a flowchart of another signal transmission method provided by an embodiment of the present invention;

3 is a flowchart of another signal transmission method provided by an embodiment of the present invention;

4 is a flowchart of another signal transmission method provided by an embodiment of the present invention;

FIG. 5 is a model of a wireless communication multi-antenna transmission system provided by an embodiment of the present invention;

6 is a schematic diagram of a quadrature amplitude decision area in a signal transmission method provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of performance comparison of signal transmission systems under different offsets of different signal transmission methods provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram illustrating a comparison of safety performances of signal transmission systems under different signal transmission methods provided by an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a signal transmission apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of another signal transmission apparatus provided by an embodiment of the present invention;

11 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of another electronic device according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention discloses a signal transmission method, which is applied to a sending end device. As shown in FIG. 1 , the method may include the following steps:

Step 101: Perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain a symbol vector to be encoded.

Step 102, based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, and the relational expression is: based on the sphere decoding parameters and The relationship between the symbol vector and the disturbance vector established by the precoding matrix.

Step 103 , using the target disturbance vector and the precoding matrix to precode the symbol vector to be coded to obtain the signal to be sent.

Step 104: Send the signal to be sent.

Using the method provided by the embodiment of the present invention, the relationship between the pre-established symbol vector and the perturbation vector that needs to be satisfied, and the perturbation vector that satisfies the relationship between the symbol vector to be encoded, are used as the target perturbation vector, and then After using the target disturbance vector and the precoding matrix to precode the to-be-coded symbol vector to obtain the to-be-sent signal, the to-be-sent vector can be sent directly, that is, all the energy of the transmitting end can be used to transmit the valid signal, without the need to transmit artificial noise unrelated to the valid signal ; Further, the signal sent by the transmitting end received by the receiving end does not contain artificial noise, thereby improving the performance of the receiving end in receiving effective signals. In addition, by adding a target disturbance vector at the transmitting end, the equivalent noise intensity of the receiving end can be effectively reduced, thereby further improving the performance of the receiving end receiving valid signals.

The method and device provided by the present invention will be described in detail below with specific embodiments in conjunction with the accompanying drawings.

In an embodiment of the present invention, as shown in FIG. 2 , the signal transmission method applied to the sending end device provided by the embodiment of the present invention may include the following steps:

Step 201: Perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain a symbol vector to be encoded.

Step 202, adopt the following formula to determine the complex integer vector satisfying the following formula, as the target complex integer vector l:

Among them, the target complex integer vector l≠0, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vectors li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix , τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation points, Δ represents the distance between the modulation constellation points, δ _τ represents the additional The offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user.

In step 203, the following formula is adopted, and the target complex integer vector is multiplied by the sphere decoding parameter to obtain the target disturbance vector:

p=τ _s l

where p represents the target perturbation vector.

In the embodiment of the present invention, an improved sphere decoding algorithm can be obtained based on a standard sphere decoding algorithm, and further, a target disturbance vector can be determined based on the improved sphere decoding algorithm.

Step 204, using the target disturbance vector to precode the to-be-coded symbol vector to obtain the to-be-sent signal.

In the embodiment of the present invention, the precoding of the symbol vector to be encoded may be specifically:

Use a precoding matrix in the form of ZF (Zero-forcing precoding, zero-forcing precoding) to precode the symbol vector to be coded; or use a precoding matrix in the form of RZF (Regularized Zero-forcing precoding, regular zero-forcing precoding), treat A vector of encoded symbols for precoding.

In this step, if there are K legal user terminals in the communication system, taking ZF precoding as an example, when a precoding matrix in the form of ZF precoding is used, the precoding matrix is the pseudo-inverse matrix of the channel matrix of the legal user terminal, and this When the symbol vector to be encoded is superimposed with the target disturbance vector, the obtained signal to be sent can be expressed as:

W表示预编码矩阵，u表示待编码符号向量，

表示合法用户终端的信道矩阵的伪逆矩阵，β表示功率归一化常数，

where p=τ _s l represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation point, Δ represents the modulation constellation distance between points, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , l represents the K-dimensional target complex integer vector,

W represents the precoding matrix, u represents the symbol vector to be encoded,

represents the pseudo-inverse of the channel matrix of the legitimate user terminal, β represents the power normalization constant,

Step 205: Send the signal to be sent.

In this embodiment of the present invention, the signal to be sent may be sent by mapping the signal to the corresponding antenna.

Using the method provided by the embodiment of the present invention, the relationship between the pre-established symbol vector and the perturbation vector that needs to be satisfied, and the perturbation vector that satisfies the relationship between the symbol vector to be encoded, are used as the target perturbation vector, and then After using the target disturbance vector to precode the to-be-coded symbol vector to obtain the to-be-sent signal, the to-be-sent vector can be sent directly, that is, the energy of the transmitting end can be used to transmit the valid signal without the need to transmit artificial noise unrelated to the valid signal; further, The signal sent by the transmitting end received by the receiving end does not contain artificial noise, thereby improving the performance of the receiving end in receiving valid signals. In addition, by adding a target disturbance vector at the transmitting end, the equivalent noise intensity of the receiving end can be effectively reduced, thereby improving the performance of the receiving end receiving valid signals.

Based on the same inventive concept, an embodiment of the present invention also discloses a signal transmission method, which is applied to a receiving end device. As shown in FIG. 3 , it may include the following steps:

Step 301: Receive a signal sent by the transmitting end device. The signal is obtained by the transmitting end device using the target disturbance vector to precode the symbol vector to be encoded. : The relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix.

In step 302, a complex modulo operation corresponding to the relational expression is used to perform a complex modulo operation on the received signal to obtain a signal to be demodulated.

Step 303, demodulate the signal to be demodulated to obtain the received bit information stream.

By adopting the method provided by the embodiment of the present invention, after receiving the signal sent by the transmitting end device, by adopting the complex extraction method corresponding to the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix In the modulo mode, a complex modulo operation is performed on the received signal to obtain the to-be-demodulated signal, and further, the to-be-demodulated signal can be demodulated to obtain the received bit information stream. Since all the energy of the transmitter can be used to transmit valid signals, there is no need to transmit artificial noise unrelated to the valid signal; further, the signal sent by the transmitter does not contain artificial noise at the receiver, thereby improving the reception of the receiver. Effective signal performance. In addition, the target disturbance vector added by the transmitting end can effectively reduce the equivalent noise intensity of the receiving end, thereby further improving the performance of the receiving end receiving valid signals.

In an embodiment of the present invention, as shown in FIG. 4 , the signal transmission method applied to the receiving end device provided by the embodiment of the present invention may include the following steps:

Step 401: Receive a signal sent by the sending end device.

In the embodiment of the present invention, as shown in FIG. 5 , if the point-to-point MIMO (Multiple-Input Multiple-Output) transmission model of the quadrature amplitude modulation technology is used, the transmitter Alice has N _A transmitting antennas, and the legitimate user The terminal Bob has N _B receiving antennas, and the eavesdropping user terminal Eve has N _E receiving antennas, where the signal vector received by Bob can be expressed as:

z=Hx ₊ nB

The signal vector received by Eve can be expressed as:

y=Gx+n _E

为复高斯噪声向量，其元素分布满足

及

表示Bob处的信道矩阵，

表示Eve处的信道矩阵，x表示发送端设备所发送的信号。in,

is a complex Gaussian noise vector whose element distribution satisfies

and

represents the channel matrix at Bob,

Represents the channel matrix at Eve, and x represents the signal sent by the transmitting end device.

Step 402, determining the signal to be demodulated.

In the embodiment of the present invention, the target disturbance vector is calculated by adopting the following formula:

p=τ _s l

Among them, l represents the target complex integer vector, and l≠0, p represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, and c _max represents the modulation constellation point The maximum amplitude value of , Δ represents the distance between modulation constellation points, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user;

Among them, the target complex integer vector is calculated by the following formula:

Wherein, l' represents a complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix.

In the embodiment of the present invention, the received signal may be modulo complexly obtained, and then the obtained signal may be determined as the signal to be demodulated. Specifically, it can be:

For a legitimate user terminal, the following formula can be used to perform complex modulo on the received signal:

表示待解调信号，β表示功率归一化常数，z表示接收端设备所接收到的信号，

为(βz)的实部，

为(βz)的虚部，

Λ表示与调制信号所对应的星座区域，τ_S表示球译码参数，τ表示标准参数，τ＝2(c_max+Δ/2)，且τ_S与τ满足：τ_s＝τ+δ_τ，δ_τ表示额外偏移量，j为虚数单位，u表示已接收比特信息流，

为复高斯噪声向量，其元素分布满足

in,

represents the signal to be demodulated, β represents the power normalization constant, z represents the signal received by the receiving end device,

is the real part of (βz),

is the imaginary part of (βz),

Λ represents the constellation region corresponding to the modulated signal, τ _S represents the spherical decoding parameter, τ represents the standard parameter, τ=2(c _max +Δ/2), and τ _S and τ satisfy: τ _s =τ+δ _τ , δ _τ represents the extra offset, j is the imaginary unit, u represents the received bit information stream,

is a complex Gaussian noise vector whose element distribution satisfies

Among them, the constellation area corresponding to the modulation can be specifically expressed as:

Among them, c represents the constellation region corresponding to the modulation, and C represents the constellation region. It can be known from the complex modulo result of the received signal by the legitimate user terminal that the interference of the target disturbance vector has been eliminated in the to-be-demodulated signal obtained by the legitimate user terminal after performing the complex modulo.

Step 403, demodulate the signal to be demodulated to obtain the received bit information stream.

In the embodiment of the present invention, the demodulation performed by the legitimate user terminal for the signal to be demodulated may specifically be:

Based on the relationship between the signal to be demodulated and the bit information stream, the following formula is used to demodulate the signal to be demodulated to obtain the received bit information stream:

where u represents the received bit stream.

By adopting the method provided by the embodiment of the present invention, after receiving the signal sent by the transmitting end device, by adopting the complex extraction method corresponding to the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix In the modulo mode, a complex modulo operation is performed on the received signal to obtain the to-be-demodulated signal, and further, the to-be-demodulated signal can be demodulated to obtain the received bit information stream. Since all the energy of the transmitter can be used to transmit valid signals, there is no need to transmit artificial noise unrelated to the valid signal; further, the signal sent by the transmitter does not contain artificial noise at the receiver, thereby improving the reception of the receiver. Effective signal performance. In addition, the target disturbance vector added by the transmitting end can effectively reduce the equivalent noise intensity of the receiving end, thereby improving the performance of the receiving end receiving valid signals.

其中

表示H的伪逆矩阵。在标准向量扰动预编码算法中标准参数τ＝2(c_max+Δ/2)，其中，c_max为星座点的最大幅度值，Δ为星座点之间的距离。在本发明实施例中，标准参数τ加上一个额外的偏移量δ_τ可以构成球译码参数τ_S：τ_s＝τ+δ_τ＝2(c_max+Δ/2)+δ_τ，本发明实施例中，扰动向量可以采用球译码算法得出。In a possible implementation manner, the transmitting end may use a precoding matrix to eliminate interference between legitimate user terminals after passing through the channel, and the commonly used precoding matrix may be

in

represents the pseudo-inverse of H. In the standard vector perturbation precoding algorithm, the standard parameter τ=2(c _max +Δ/2), where c _max is the maximum amplitude value of the constellation points, and Δ is the distance between the constellation points. In this embodiment of the present invention, the standard parameter τ plus an additional offset _δτ can constitute the sphere decoding parameter τ _S : τ _s =τ+δ _τ =2(c _max +Δ/2)+δ _τ , In this embodiment of the present invention, the disturbance vector may be obtained by using a sphere decoding algorithm.

As shown in Figure 5, if the point-to-point MIMO transmission model of quadrature amplitude modulation technology is used, the transmitter Alice has NA transmit antennas, the legitimate user terminal Bob has _NB receive antennas, and the eavesdropping user terminal Eve has _{NE receive} antennas .

As shown in Figure 5, the signal received by Bob can be represented as:

z=Hx ₊ nB

进一步的，Bob接收的信号可以被表示为：in,

Further, the signal received by Bob can be represented as:

Further, Bob can perform complex modulo on the received signal:

It can be obtained that after the complex modulo operation, Bob can completely eliminate the interference introduced by the target disturbance vector p.

Λ表示与调制信号所对应的星座区域，具体可以表示为：in,

Λ represents the constellation region corresponding to the modulated signal, which can be specifically expressed as:

Further, Bob can demodulate the signal to be demodulated to obtain the received bit information stream:

As shown in Figure 5, the signal vector received by Eve can be expressed as:

y=Gx+n _E

进一步的，Eve接收的信号可以被表示为：Among them, due to

Further, the signal received by Eve can be expressed as:

Among them, since p=τ _s l, the signal received by Eve can be further expressed as:

此时窃听用户终端所接收到的信号可以分为两部分：待解调的有用信号

与干扰项

It can be seen from the signals received by the eavesdropping user terminal that, in this embodiment of the present invention, if considering the worst security situation for the legitimate user terminal: it can be assumed that the eavesdropping user terminal can obtain the channel matrix H and the channel matrix G, the power normalization Constant β and modulation order, from which the standard parameter τ=2 (c _max +Δ/2) can be calculated, but since δ _τ is agreed by the sender and the legitimate user terminal in advance, the eavesdropping user terminal cannot be actually used the parameter τ _s . Further, it is assumed that the noise of eavesdropping on the user terminal is infinitely small, that is,

At this time, the signal received by the eavesdropping user terminal can be divided into two parts: the useful signal to be demodulated

with distractors

Further, the signal recovered by the eavesdropping user terminal using the power normalization constant β can be expressed as:

Further, after performing the complex modulo operation on the recovered signal, it can be predicted that the signal obtained by eavesdropping on the user terminal is:

Wherein, M _τ (r _E ) represents that the eavesdropping user terminal performs complex modulo on the recovered signal r _E.

根据格点理论，判断

能否正确解调为保密信号u的关键在于判断其是否落在目标格点GWu的Voronoi region(V氏图区域)

内，可以定义安全泄漏概率为窃听用户终端能够正确判决的概率：

In this embodiment of the present invention, the complex number lattice constructed by the matrix GP is considered

According to lattice theory, judge

The key to correctly demodulating the secret signal u is to determine whether it falls in the Voronoi region of the target grid point GWu (V-plot region)

, the security leakage probability can be defined as the probability that the eavesdropping user terminal can make a correct decision:

In the embodiment of the present invention, to ensure that the signal is safely transmitted at the physical layer in the signal transmission system, the signal sent by the sender satisfies the following two constraints:

Constraint 1: The necessary condition to ensure the safe transmission of signals at the physical layer is: l≠0.

也即窃听用户终端能够完全正确解调，此时不能保证信号传输的安全。因此，可以得到约束条件一：保证信号在物理层进行安全传输的必要条件为：l≠0。If the vector l=0, then

That is, the eavesdropping user terminal can completely and correctly demodulate, and the security of signal transmission cannot be guaranteed at this time. Therefore, the first constraint condition can be obtained: the necessary condition to ensure the safe transmission of signals in the physical layer is: l≠0.

严格对齐，其在复数格在

上投影的幅度由δ_τ与l决定。如图6所示的投影在复数格上的N_B层中满足l_i≠0的第i层正交幅度调制的判决区域，根据判决空间是否闭合可以将星座点分为两类：具有闭合判决空间的星座点集合X以及剩下的具有半开判决空间的星座点集合Z。对于集合X内的星座点来说，由于干扰项的方向总是与复数格

严格对齐，在相邻星座点的距离为Δ时，为了保证窃听用户终端的信号

需要选取合适的偏移量δ_τ，满足下式中的幅度限制：Assuming that the target disturbance vector p=τ _s l, which both satisfy l≠0, at the eavesdropper, the signal obtained by the expected eavesdropping user terminal is only affected by the interference term M _τ (δ _τ GWl), and at the same time, as shown in Figure 6 shown, it can be seen that the interference term is in the same direction as the complex number

Strictly aligned, which in the plural case is

The magnitude of the up-projection is determined by _δτ and l. As shown in Fig. 6, the NB layer projected on the complex lattice is the decision area of the i _- th layer quadrature amplitude modulation satisfying l _i ≠ 0. According to whether the decision space is closed, the constellation points can be divided into two categories: those with closed decision The constellation point set X of the space and the remaining constellation point set Z with half-open decision space. For the constellation points in the set X, since the direction of the interference term is always the same as that of the complex lattice

Strict alignment, when the distance between adjacent constellation points is Δ, in order to ensure that the signal of the user terminal is eavesdropped

It is necessary to select a suitable offset δ _τ to satisfy the amplitude limit in the following formula:

依然有可能落在目标格点GWu的Voronoi

内，此时信号传输系统的安全性将无法保证。For the constellation points in the set Z, because they have a half-open decision interval, only the interference term M _τ (δ _τ GWl) that satisfies the amplitude restriction. Since the directions of li and _{u i may} be the same, the signal

It is still possible to land on the Voronoi of the target grid GWu

In this case, the security of the signal transmission system will not be guaranteed.

用数学符号表示如下式：Based on this, the second constraint condition can be obtained: for the constellation points in the set Z, it needs to satisfy that the directions of the vectors _li and _ui are not exactly the same. Only when the directions of the vectors _li and _ui are not exactly the same can be guaranteed

Express the following formula in mathematical notation:

In the embodiment of the present invention, the security of the signal transmission of the signal transmission system can be ensured to a large extent through the conditions satisfied by the vector l in the first and second constraints. Moreover, when the vector l fully satisfies the first and second constraints, the security of the signal transmission of the signal transmission system can be completely guaranteed.

In the embodiment of the present invention, an improved ball decoding algorithm can be used to ensure that the target disturbance vector satisfying the first and second constraints can be obtained, and the security leakage probability P _L =0 can be obtained. As shown in FIG. 7, FIG. 7 compares other schemes with the scheme provided by the embodiment of the present invention. When N _A = _NB = _NE =8, 16-QAM modulation is used, the SNR (signal-to-noise ratio) at Bob is 25dB, The performance comparison of the security leakage probability _PL at the eavesdropping user terminal Eve and the bit error rate BER at the legitimate user terminal Bob under the variation of the offset _δτ . Among them, the bit error rate represents: in a digital communication system, within the bit interval T, the transmitter sends out the binary symbol s, and after transmission, the binary symbol output by the receiver is not s. The probability.

时，VP算法和本发明实施例提供的方案的安全泄露P_L＝1，在偏移量δ_τ满足

时，VP始终具有较大的安全泄露概率，并且随着偏移量δ_τ的增加而增加；而本发明实施例提供的方案的安全泄露概率始终存在P_L＝0。从图7中可以看到，在偏移量δ_τ＝0附近VP算法和本发明实施例提供的方案中Bob的误码率最低，信号传输系统的性能最好；而在δ_τ＜0时，由于接收端复取模后将会引入大量星座点重叠，导致BER随着δ_τ的减少呈指数上升，因此在设计安全传输方案时通常选取

As shown in FIG. 7 , _PL standard (standard) represents the security leakage probability of VP (Vector Perturbation precoding, vector perturbation precoding), and _PL proposed (proposed) represents the security leakage probability of the solution provided by the embodiment of the present invention, FIG. 7 The middle abscissa represents the offset δ _τ , the left ordinate represents the security leakage probability, and the right ordinate represents the bit error rate BER at the legal user terminal Bob. As shown in FIG. 7 , when the abscissa axis is [-0.5×10 ^-6 , 0.5×10 ^-6 ], the probability of security leakage is 1, and the equivalent transmit power of the transmitter is the smallest at this time. It can be seen from Figure 7 that the offset δτ satisfies

When , the security leakage of the VP algorithm and the solution provided by the embodiment of the present invention is P _L =1, and the offset δ _τ satisfies

When , VP always has a larger security leakage probability, and it increases with the increase of the offset _δτ ; and the security leakage probability of the solution provided by the embodiment of the present invention always exists _PL =0. It can be seen from Fig. 7 that Bob's bit error rate is the lowest in the VP algorithm and the solution provided by the embodiment of the present invention near the offset δ _τ =0, and the performance of the signal transmission system is the best; and when δ _τ <0 , because a large number of constellation points overlap will be introduced after the receiving end takes the complex modulo, resulting in an exponential increase in BER with the decrease of δ _τ , so it is usually selected when designing a secure transmission scheme.

As shown in FIG. 8 , FIG. 8 shows that when the number of antennas is NA ₌ 6, NB =NE _{= 4} , and the offset δτ = _0.51Δ , the solution provided by the embodiment of the present invention and the classical VP algorithm and Comparison of signal transmission system performance of two artificial noise schemes.

In FIG. 8 proposedVP represents a solution provided by an embodiment of the present invention, standardVP represents a solution based on a standard VP algorithm, and AN-ZF and ANVP represent two other artificial noise solutions different from the embodiment of the present invention. In FIG. 8 , the abscissa represents the signal-to-noise ratio at the legitimate user terminal Bob, the ordinate on the left represents the security leakage probability _PL , and the ordinate on the right represents the bit error rate BER at the legitimate user terminal Bob.

The solid line in Figure 8 is the comparison of the security performance of different schemes. It can be seen that the standard VP algorithm has the largest security leakage probability, which is about 3× ^10-1 on average, and the average security leakage probability of the AN-ZF scheme is about 10- ⁴ , the security leakage probability based on the ANVP scheme is about ^10-5 on average, while the security leakage probability of the scheme provided by the embodiment of the present invention is 0. From Figure 8, we can also see that the standard VP algorithm can obtain the lowest bit error rate, that is, the optimal diversity gain. The solution provided by the embodiment of the invention considers the system security, compared with AN-ZF and ANVP artificial The noise scheme has a lower bit error rate, that is, the performance of the signal transmission system is better.

In the embodiment of the present invention, the target disturbance vector can be determined based on the improved sphere decoding algorithm in the following manner:

Step A1, convert the symbol vector to be encoded into an equivalent real number vector

其中，u_t表示球译码算法的目标向量；Step A2, determine the real number form of the target vector of the ball decoding algorithm

Among them, _ut represents the target vector of the ball decoding algorithm;

Step A3, calculate the linear real matrix corresponding to τ _s and W;

In this step, the corresponding linear real matrix can be specifically expressed as:

Among them, H _t represents the corresponding linear real matrix;

Step A4: Calculate the QR decomposition and the diagonal matrix corresponding to the matrix H _t .

Among them, the QR decomposition can be specifically expressed as:

[Q _t , R _t ]=QR(H _t )

The diagonal matrix can be specifically expressed as:

D=diag(sign(diag(R _t )));

Step A5, based on the target vector, QR decomposition and diagonal matrix of the sphere decoding algorithm, calculate the disturbance vector that satisfies the first constraint and the second preset constraint and has the smallest distance as the target disturbance vector.

In the artificial noise scheme, in order to achieve the effect that the artificial noise vector only interferes with the eavesdropping user terminal, the selection of the noise vector must be carried out in the null space of the channel of the legal user terminal, so it is required that the channel of the legal user terminal must have non-zero zeros. Space, that is, the number of antennas of the legitimate user terminal must be less than the number of antennas of the transmitting end. However, in the embodiment of the present invention, it is not necessary to satisfy the limit on the number of antennas, that is, the number of antennas of a legitimate user terminal may not be less than the number of antennas at the transmitting end, which increases the spatial freedom of transmitting signals compared with the prior art, and the solution provided by the embodiments of the present invention The security of signal transmission can be ensured only when the unknown offset δ _τ of the eavesdropping user terminal is satisfied, and the security leakage of the transmission signal caused by the artificial noise scheme in the scenario with a small number of antennas and a low modulation order is avoided.

Based on the same inventive concept, according to the signal transmission method provided by the above-mentioned embodiments of the present invention, correspondingly, another embodiment of the present invention also provides a signal transmission apparatus, which is applied to a transmitting end device. The schematic structural diagram is shown in FIG. 9 , Specifically include:

A modulation module 901, configured to perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain a symbol vector to be encoded;

The determining module 902 is used to determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, as the target disturbance vector, and the relational expression is: The relationship between the symbol vector and the disturbance vector established by the code parameters and the precoding matrix;

The precoding module 903 is used for precoding the symbol vector to be encoded by using the target disturbance vector and the precoding matrix to obtain the signal to be sent;

The signal sending module 904 is used for sending the signal to be sent.

It can be seen that, using the device provided by the embodiment of the present invention, the pre-established relational expression between the symbol vector and the disturbance vector that needs to be satisfied, and the disturbance vector that satisfies the relational expression between the symbol vector to be encoded, is used as the target disturbance vector , and then after using the target disturbance vector to precode the symbol vector to be encoded to obtain the signal to be sent, the vector to be sent can be directly sent, that is, the energy of the transmitting end can be used to transmit the valid signal without the need to transmit artificial noise unrelated to the valid signal; further Therefore, the receiving end receives the signal sent by the transmitting end, and no artificial noise is contained, thereby improving the performance of the receiving end in receiving valid signals. In addition, by adding a target disturbance vector at the transmitting end, the equivalent noise intensity of the receiving end can be effectively reduced, thereby further improving the performance of the receiving end receiving valid signals.

Further, the determining module 902 is specifically configured to adopt the following formula to determine a complex integer vector satisfying the following formula as the target complex integer vector l:

The determination module 902 is further configured to adopt the following formula to multiply the target complex integer vector by the sphere decoding parameter to obtain the target disturbance vector:

p=τ _s l

Among them, the target complex integer vector l≠0, p represents the target disturbance vector, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, and _i represents the ith dimension of the vector , W represents the precoding matrix, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation point, Δ represents the difference between the modulation constellation points distance, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user.

Further, the precoding module 1003 is specifically configured to use the following formula to perform precoding on the symbol vector to be encoded by using the target disturbance vector and the precoding matrix to obtain the signal to be sent:

x表示待发送信号。where β is the power normalization constant,

x represents the signal to be sent.

Another embodiment of the present invention also provides a signal transmission device, which is applied to a receiving end device. The schematic diagram of the structure is shown in FIG. 10 , and specifically includes:

The signal receiving module 1001 is used for receiving the signal sent by the transmitting end device, the signal is obtained by the transmitting end device using the target disturbance vector and the precoding matrix to precode the symbol vector to be encoded, and the relationship between the symbol vector to be encoded and the target disturbance vector satisfies a pre-encoding condition. The relational expression established, the relational expression is: the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix;

The complex modulo module 1002 is configured to use a complex modulo method corresponding to the relational expression to perform a complex modulo operation on the received signal to obtain a signal to be demodulated;

The demodulation module 1003 is used for demodulating the signal to be demodulated to obtain the received bit information stream.

It can be seen that, by using the device provided by the embodiment of the present invention, after receiving the signal sent by the transmitting end device, by adopting the formula corresponding to the relationship between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix In the complex modulo mode, a complex modulo operation is performed on the received signal to obtain the to-be-demodulated signal, and further, the to-be-demodulated signal can be demodulated to obtain the received bit information stream. Since all the energy of the transmitter can be used to transmit valid signals, there is no need to transmit artificial noise unrelated to the valid signal; further, the signal sent by the transmitter does not contain artificial noise at the receiver, thereby improving the reception of the receiver. Effective signal performance. In addition, by adding a target disturbance vector at the transmitting end, the equivalent noise intensity of the receiving end can be effectively reduced, thereby further improving the performance of the receiving end receiving valid signals.

Further, the target disturbance vector is calculated by the following formula:

p=τ _s l

Among them, l represents the target complex integer vector, and l≠0, p represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, and c _max represents the modulation constellation point The maximum amplitude value of , Δ represents the distance between modulation constellation points, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user;

The target complex integer vector is calculated using the following formula:

Wherein, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix;

The complex modulo module 1002 is specifically configured to use the following formula to determine the signal to be demodulated:

表示待解调信号，β表示功率归一化常数，z表示接收端设备所接收到的信号，

为(βz)的实部，

为(βz)的虚部，

Λ表示与调制信号所对应的星座区域，τ_S表示球译码参数，τ表示标准参数，且τ_S与τ满足：τ_s＝τ+δ_τ，δ_τ表示额外偏移量，j为虚数单位。in,

represents the signal to be demodulated, β represents the power normalization constant, z represents the signal received by the receiving end device,

is the real part of (βz),

is the imaginary part of (βz),

Λ represents the constellation region corresponding to the modulated signal, τ _S represents the spherical decoding parameter, τ represents the standard parameter, and τ _S and τ satisfy: τ _s =τ+δ _τ , δ _τ represents the extra offset, and j is an imaginary number unit.

Further, the demodulation module 1003 is specifically used for demodulating the signal to be demodulated based on the relational expression satisfied by the signal to be demodulated and the bit information stream, and using the following formula to demodulate the signal to be demodulated to obtain the received bit information stream:

为复高斯噪声向量，其元素分布满足

where u represents the received bit stream,

is a complex Gaussian noise vector whose element distribution satisfies

Based on the same inventive concept, according to the risk identification method provided by the above-mentioned embodiment of the present invention, correspondingly, another embodiment of the present invention further provides an electronic device. Referring to FIG. 11 , the electronic device in the embodiment of the present invention includes a processor 1101, The communication interface 1102 , the memory 1103 and the communication bus 1104 , wherein the processor 1101 , the communication interface 1102 , and the memory 1103 complete the communication with each other through the communication bus 1104 .

a memory 1103 for storing computer programs;

When the processor 1101 is used to execute the program stored in the memory 1103, the following steps are implemented:

Perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain the symbol vector to be encoded;

Based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, and the relational expression is: The relationship between the symbol vector and the disturbance vector established by the code parameters and the precoding matrix;

using the target disturbance vector to precode the to-be-coded symbol vector to obtain a to-be-sent signal;

The to-be-sent signal is sent.

Based on the same inventive concept, according to the risk identification method provided by the above-mentioned embodiment of the present invention, correspondingly, another embodiment of the present invention further provides an electronic device. Referring to FIG. 12 , the electronic device in the embodiment of the present invention includes a processor 1201, The communication interface 1202 , the memory 1203 and the communication bus 1204 , wherein the processor 1201 , the communication interface 1202 , and the memory 1203 complete the communication with each other through the communication bus 1204 .

The memory 1203 is used to store computer programs;

When the processor 1201 is used to execute the program stored in the memory 1203, the following steps are implemented:

Receive the signal sent by the sending end device, the signal is obtained by the sending end device using the target disturbance vector to precode the symbol vector to be encoded, and the relationship between the symbol vector to be encoded and the target disturbance vector satisfies a pre-established relationship formula, the relational formula is: the relational formula between the symbol vector and the disturbance vector established based on the sphere decoding parameter and the precoding matrix;

Using a complex modulo mode corresponding to the relational expression, performing a complex modulo operation on the received signal to obtain a signal to be demodulated;

The signal to be demodulated is demodulated to obtain the received bit information stream.

The communication bus mentioned in the above electronic device may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA) bus or the like. The communication bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

The communication interface is used for communication between the above electronic device and other devices.

The memory may include random access memory (Random Access Memory, RAM), and may also include non-volatile memory (Non-Volatile Memory, NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

The above-mentioned processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; may also be a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

In another embodiment provided by the present invention, a computer-readable storage medium is also provided, and a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the above-mentioned application to the sending end device is realized. The steps of any signal transmission method.

In yet another embodiment provided by the present invention, there is also provided a computer program product including instructions, which, when running on a computer, enables the computer to execute any of the above signal transmission methods applied to the sending end device.

In another embodiment provided by the present invention, a computer-readable storage medium is also provided, and a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the above-mentioned application to the receiving end device is realized. The steps of any signal transmission method.

In yet another embodiment provided by the present invention, there is also provided a computer program product including instructions, which, when running on a computer, enables the computer to execute any of the above signal transmission methods applied to the receiving end device.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), among others.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

Each embodiment in this specification is described in a related manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. Especially, for the embodiments of the apparatus, electronic equipment and storage medium, since they are basically similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for related parts.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (8)

1. a signal transmission method, is characterized in that, is applied to sending end equipment, and described method comprises: Perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain the symbol vector to be encoded; Based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, and the relational expression is: The relationship between the symbol vector and the disturbance vector established by the code parameters and the precoding matrix; using the target disturbance vector and the precoding matrix to precode the to-be-coded symbol vector to obtain a to-be-sent signal; sending the to-be-sent signal; Based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, including: Using the following formula, determine the complex integer vector satisfying the following formula as the target complex integer vector l:

The target perturbation vector is obtained by multiplying the target complex integer vector by the sphere decoding parameter using the following formula: p=τ _s l Among them, the target complex integer vector l≠0, p represents the target disturbance vector, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, and _i represents the ith dimension of the vector , W represents the precoding matrix, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation point, Δ represents the difference between the modulation constellation points distance, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , where M _τ represents the complex modulo operation, and G represents the eavesdropping user The channel impulse response matrix. 2. The method according to claim 1, characterized in that, using the target disturbance vector and the precoding matrix to perform precoding on the to-be-coded symbol vector to obtain the to-be-sent signal, comprising: Using the following formula, the target disturbance vector is used to precode the to-be-coded symbol vector to obtain the to-be-sent signal:

where β is the power normalization constant,

x represents the signal to be sent. 3. A signal transmission method, characterized in that, applied to a receiving end device, the method comprising: Receive a signal sent by the transmitting end device, the signal is obtained by the transmitting end device using the target disturbance vector and the precoding matrix to precode the symbol vector to be encoded, and the relationship between the symbol vector to be encoded and the target disturbance vector satisfies The relational expression established in advance, the relational expression is: the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameter and the precoding matrix; Using a complex modulo mode corresponding to the relational expression, performing a complex modulo operation on the received signal to obtain a signal to be demodulated; demodulating the to-be-demodulated signal to obtain a received bit information stream; The target disturbance vector is calculated by the following formula: p=τ _s l Among them, l represents the target complex integer vector, and l≠0, p represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, and c _max represents the modulation constellation point The maximum amplitude value of , Δ represents the distance between modulation constellation points, δ _τ represents the additional offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user; The target complex integer vector is calculated by the following formula:

Wherein, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix; The complex modulo operation corresponding to the relational expression is used to perform a complex modulo operation on the received signal to obtain the signal to be demodulated, including: Use the following formula to determine the signal to be demodulated:

in,

represents the signal to be demodulated, β represents the power normalization constant, z represents the signal received by the receiving end device,

is the real part of (βz),

is the imaginary part of (βz),

Λ represents the constellation region corresponding to the modulated signal, τ _S represents the spherical decoding parameter, τ represents the standard parameter, and τ _S and τ satisfy: τ _s =τ+δ _τ , δ _τ represents the extra offset, and j is an imaginary number unit. 4. The method according to claim 3, wherein the demodulating the to-be-demodulated signal to obtain the received bit information stream comprises: Based on the relationship between the signal to be demodulated and the bit information stream, the following formula is used to demodulate the signal to be demodulated to obtain the received bit information stream:

where u represents the received bit stream,

is a complex Gaussian noise vector whose element distribution satisfies

5. A signal transmission device, characterized in that, applied to a sending end device, the device comprising: The modulation module is used to perform quadrature amplitude modulation on the bit information stream to be transmitted to obtain the symbol vector to be encoded; The determining module is used to determine, based on the relational expression that needs to be satisfied between the pre-established symbol vector and the disturbance vector, to determine the disturbance vector that satisfies the relational expression with the symbol vector to be encoded, as the target disturbance vector, the relational expression is: the relational expression between the symbol vector and the disturbance vector established based on the sphere decoding parameters and the precoding matrix; a precoding module, configured to perform precoding on the to-be-coded symbol vector by using the target disturbance vector and the pre-coding matrix to obtain a to-be-sent signal; a signal sending module for sending the to-be-sent signal; The determination module is specifically used to adopt the following formula to determine a complex integer vector satisfying the following formula, as the target complex integer vector l:

The determining module is also specifically used for adopting the following formula to multiply the target complex integer vector by the sphere decoding parameter to obtain the target disturbance vector: p=τ _s l Among them, the target complex integer vector l≠0, p represents the target disturbance vector, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, and _i represents the ith dimension of the vector , W represents the precoding matrix, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, c _max represents the maximum amplitude value of the modulation constellation point, Δ represents the difference between the modulation constellation points distance, δ _τ represents the extra offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , where M _τ represents the complex modulo operation, and G represents the eavesdropping user The channel impulse response matrix. 6. A signal transmission device, characterized in that, applied to a receiving end device, the device comprising: The signal receiving module is used to receive the signal sent by the transmitting end device, the signal is obtained by the transmitting end device using the target disturbance vector and the precoding matrix to precode the symbol vector to be encoded, and the symbol vector to be encoded is the same as the symbol vector to be encoded. A pre-established relational expression is satisfied between the target disturbance vectors, and the relational expression is: the relational expression between the symbol vector and disturbance vector established based on the sphere decoding parameter and the precoding matrix; a complex modulo module, configured to perform a complex modulo operation on the received signal by using a complex modulo manner corresponding to the relational expression to obtain a signal to be demodulated; a demodulation module, configured to demodulate the to-be-demodulated signal to obtain a received bit information stream; The target disturbance vector is calculated using the following formula: p=τ _s l Among them, l represents the target complex integer vector, and l≠0, p represents the target disturbance vector, τ _s =2(c _max +Δ/2)+δ _τ , τ _S represents the spherical decoding parameter, and c _max represents the modulation constellation point The maximum amplitude value of , Δ represents the distance between modulation constellation points, δ _τ represents the additional offset, δ _τ satisfies the amplitude limit: ||M _τ (δ _τ GWl)|| ² >(Δ/2) ² , G represents the channel impulse response matrix of the eavesdropping user; The target complex integer vector is calculated using the following formula:

Wherein, l' represents the complex integer vector, u represents the symbol vector to be encoded, the directions of the disturbance vector li and _ui are not exactly the same, _i represents the ith dimension of the vector, and W represents the precoding matrix; The complex modulo module is specifically used to determine the signal to be demodulated by using the following formula:

in,

represents the signal to be demodulated, β represents the power normalization constant, z represents the signal received by the receiving end device,

is the real part of (βz),

is the imaginary part of (βz),

Λ represents the constellation region corresponding to the modulated signal, τ _S represents the spherical decoding parameter, τ represents the standard parameter, and τ _S and τ satisfy: τ _s =τ+δ _τ , δ _τ represents the extra offset, and j is an imaginary number unit. 7. An electronic device, characterized in that it comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface, and the memory complete mutual communication through the communication bus; memory for storing computer programs; The processor is configured to implement the method steps of any one of claims 1-2 when executing the program stored in the memory. 8. An electronic device, characterized in that it comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface, and the memory complete mutual communication through the communication bus; memory for storing computer programs; The processor is configured to implement the method steps described in any one of claims 3-4 when executing the program stored in the memory.

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