CN111682888A - Precoding method and system for MIMO integrated system shared transmitting array - Google Patents

Precoding method and system for MIMO integrated system shared transmitting array Download PDF

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CN111682888A
CN111682888A CN202010464029.0A CN202010464029A CN111682888A CN 111682888 A CN111682888 A CN 111682888A CN 202010464029 A CN202010464029 A CN 202010464029A CN 111682888 A CN111682888 A CN 111682888A
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sequence
radar
matrix
array
vector
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CN111682888B (en
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黄天耀
刘一民
王希勤
刘祥
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Tsinghua University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0465—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account

Abstract

The embodiment of the invention provides a precoding method and a system for a shared transmitting array of an MIMO integrated system, wherein the method comprises the following steps: mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector; generating a radar pseudorandom emission sequence through random phase coding, and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence; and performing linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array. The embodiment of the invention obtains the array transmitting signals by carrying out linear precoding on a group of independent radar pseudo-random transmitting sequences and multi-user communication symbols, thereby ensuring that the signals transmitted by each array element are orthogonal, completely eliminating the interference between user terminals and simultaneously optimizing the lowest signal-to-interference-and-noise ratio of each user terminal.

Description

Precoding method and system for MIMO integrated system shared transmitting array
Technical Field
The invention relates to the technical field of communication and radar integration, in particular to a precoding method and a precoding system for a shared transmitting array of an MIMO (multiple input multiple output) integrated system.
Background
In the communication radar integrated system, the communication and radar share the transmitting front end and the frequency spectrum, so that the frequency spectrum resource can be effectively saved, and the size and the cost of a hardware system are reduced. The existing communication radar integrated system can be divided into a single antenna system and an MIMO system. For a single antenna system, the existing integrated waveform including OFDM and LFM-CPM already has the capability of simultaneously performing communication and radar detection. However, it is difficult for the single antenna system to simultaneously satisfy the space coverage requirements of radar and communication. In order to improve the receiving signal-to-noise ratio, the radar generally requires that the main beam of the transmitting antenna is a directional beam with high gain, however, communication users may be distributed in various directions in space, and the receiving signal-to-noise ratio of communication will be seriously reduced when the communication users are located outside the main lobe of the beam.
Unlike a single antenna system, a MIMO system uses multiple transmit antennas with more spatial degrees of freedom. The multi-user MIMO communication can inhibit the interference among a plurality of users by transmitting precoding, and realize the multi-user communication based on space division multiplexing. The MIMO radar system can synthesize a virtual aperture by transmitting independent orthogonal waveforms at each antenna, improve the spatial freedom degree and the distinguishable target number of the array radar, and improve the resolution and the estimation precision of target azimuth estimation. Fig. 1 is a schematic view of a working scene of an MIMO integrated system according to an embodiment of the present invention, which can be referred to in fig. 1, where the MIMO integrated system can simultaneously implement functions of an MIMO radar and multi-user MIMO communication, and by designing transmission signals of each antenna, the MIMO integrated system can synthesize a plurality of beams pointing to a communication user while ensuring radar transmission performance, so as to optimize a received signal-to-interference-plus-noise ratio of the communication user.
However, in the conventional MIMO integrated system, when the number of the communication user terminals is less than the number of the transmitting antennas, each array element cannot transmit a completely orthogonal waveform, which results in performance loss of the MIMO radar. Therefore, there is a need for a precoding method and system for MIMO-integrated system shared transmit array to solve the above problems.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a precoding method and a precoding system for a shared transmitting array of an MIMO integrated system.
In a first aspect, an embodiment of the present invention provides a precoding method for a shared transmit array of a MIMO integrated system, including:
mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector;
generating a radar pseudorandom emission sequence through random phase coding, and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence;
and performing linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
Further, mapping the information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and performing power normalization processing on the communication symbol sequence to obtain a communication symbol vector, including:
mapping the information bit sequence to be transmitted to the kth user terminal into a communication symbol sequence ck[n]；
According to a power normalization formula, obtaining a communication symbol sequence after power normalization processing
Figure BDA0002511968850000021
The power normalization formula is as follows:
Figure BDA0002511968850000022
wherein p iskRepresenting the average power corresponding to the symbol transmitted to the kth user terminal; k is 0, …, K-1, K represents the number of user terminals; n is 0, …, N-1, N represents discrete time, N represents the number of communication symbols to be transmitted to each user terminal;
according to the communication symbol sequence after normalization processing, a communication symbol vector is constructed:
Figure BDA0002511968850000023
further, the generating a radar pseudorandom emission sequence by random phase encoding, and obtaining a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence, includes:
acquiring a radar pseudorandom emission sequence through random phase encoding:
Figure BDA0002511968850000031
wherein phi ism[n]Uniform distribution over individual (0, 1); m is 0, …, M-1, M represents the number of array elements;
according to the radar pseudo-random transmitting sequence, constructing a radar transmitting sequence vector:
r[n]＝(r0[n],r1[n],…,rM-1[n])T。
further, before the performing linear precoding processing on the communication symbol vector and the radar transmission sequence vector to obtain a baseband transmission signal sequence of a shared transmission array, the method further includes:
and constructing a precoding matrix according to the total transmission power, the noise power of the communication receiver and a channel matrix from a transmission array to each user terminal, so as to perform linear precoding processing on the communication symbol vector and the radar transmission sequence vector according to the precoding matrix.
Further, the constructing a precoding matrix according to the total transmission power, the noise power of the communication receiver and the channel matrix of the transmission array to each user terminal includes:
acquiring a covariance matrix R of a received signal of each user terminal according to the total transmission power and a channel matrix from a transmission array to each user terminal:
R＝(Pt/M)HHH；
wherein, PtRepresenting the total transmit power, H represents the channel matrix of the transmit array to each user terminal;
based on the covariance matrix R, the channel matrix H of the transmit array to each user terminal, and the communication receiver noise power σ2Converting the optimization problem into a convex optimization problem:
max t
s.t.pi≥t(Ri,i+σ2),i＝0,1,…,K-1，
Figure BDA0002511968850000032
where t denotes the optimization vector, piRepresenting the ith element in the vector p, optimizing the variables
Figure BDA0002511968850000033
Figure BDA0002511968850000034
Representing the set of all K-dimensional semi-positive definite matrices, diag (p) representing the diagonal matrix constructed from the vector p, Ri,iAn element representing the ith row and ith column of the matrix R;
conjugate transpose H of channel matrix H for transmitting array to each user terminalHQR decomposition to yield:
HH＝Qh[Lh0K×(M-K)]H；
wherein Q ishRepresenting an M-dimensional unitary matrix, LhRepresenting a K-dimensional upper triangular matrix;
for the optimization vector RfFeature decomposition is performed to obtain a first matrix ΛfAnd a second matrix Pf：
Figure BDA0002511968850000041
Performing Schmidt orthogonalization processing on each column in the random matrix K × M to obtain a third matrix U,
Figure BDA0002511968850000042
and through the first matrix ΛfThe second matrix PfAnd the third matrix U, acquiring a fourth matrix F:
Figure BDA0002511968850000043
Figure BDA0002511968850000044
conjugate transpose F of the fourth matrix FHQR decomposition to yield:
FH＝Qf[Lf0K×M]H；
wherein Q isfRepresenting a (M + K) -dimensional unitary matrix, LfRepresenting a K-dimensional upper triangular matrix;
according to conjugate transpose HHAnd conjugate transpose FHAnd constructing a precoding matrix W:
Figure BDA0002511968850000045
wherein [ Q ]f]1:MRepresents by QfThe first M columns of (a) form a matrix.
Further, the performing linear precoding processing on the communication symbol vector and the radar transmission sequence vector to obtain a baseband transmission signal sequence sharing a transmission array includes:
according to the precoding matrix W, the communication symbol vector c [ n ] and the radar transmission sequence vector r [ n ], an array transmission signal sequence formula is constructed:
Figure BDA0002511968850000046
wherein, s [ n ] represents the m item corresponding to the m array emission signal;
and acquiring a baseband transmitting signal sequence of the shared transmitting array according to the array transmitting signal sequence formula.
Further, the mapping the information bit sequence to be transmitted to each user terminal into a communication symbol sequence includes:
and mapping the information bit sequence to be transmitted to each user terminal into a communication symbol sequence by a quadrature phase shift keying modulation mode or a quadrature amplitude modulation mode.
In a second aspect, an embodiment of the present invention provides a precoding system for sharing a transmit array in a MIMO integrated system, including:
the multi-user communication symbol generation module is used for mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector;
the system comprises a radar pseudorandom emission sequence generation module, a radar pseudorandom emission sequence generation module and a radar pseudorandom emission sequence generation module, wherein the radar pseudorandom emission sequence generation module is used for generating a radar pseudorandom emission sequence through random phase coding and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence;
and the MIMO joint precoding module is used for carrying out linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method provided in the first aspect when executing the program.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method as provided in the first aspect.
According to the precoding method and the system for the MIMO integrated shared transmitting array, provided by the embodiment of the invention, the array transmitting signals are obtained by performing linear precoding on a group of independent radar pseudo-random transmitting sequences and multi-user communication symbols, so that the orthogonality of the signals transmitted by each array element is ensured, the interference among user terminals is completely eliminated, and meanwhile, the lowest signal-to-interference-and-noise ratio of each user terminal is optimal.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic view of a working scene of an MIMO integrated system according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a precoding method for a shared transmit array of a MIMO integrated system according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a relationship between a lowest received signal-to-interference-and-noise ratio and a transmitted signal-to-noise ratio of each user equipment according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a precoding system for a MIMO integrated system shared transmit array according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing MIMO integrated system takes multi-user MIMO communication signals as radar transmitting signals to carry out target detection, and the design target is to optimize a transmitting beam directional diagram of the MIMO radar under the condition that the lowest receiving signal-to-noise ratio of each communication user is higher than a given threshold value. In a specific implementation scheme, linear precoding is performed on a multi-user communication symbol to obtain an array transmission signal, wherein a variable to be designed is a precoding matrix for the communication symbol. Under the constraint that the transmitting power of each antenna is equal, a conjugate manifold gradient descent method is used for carrying out iterative optimization on a precoding matrix, and the communication performance can be ensured by constraining the received signal-to-interference-and-noise ratio. However, when the number of the communication user terminals is less than the number of the transmitting antennas, each array element cannot transmit a completely orthogonal waveform, which may cause performance loss of the MIMO radar. Meanwhile, the existing method needs to set the lowest received signal-to-interference-and-noise ratio of each user terminal, so that the lowest received signal-to-interference-and-noise ratio cannot be optimized. The precoding method for the shared transmitting array of the MIMO integrated system provided by the embodiment of the invention ensures that the transmitting waveforms of the array elements are orthogonal, the average power of the transmitting signals of the array elements is equal, and the interference among the user terminals is completely eliminated, thereby maximizing the lowest receiving signal-to-interference-and-noise ratio of the user terminals.
Fig. 2 is a schematic flowchart of a precoding method for a shared transmit array of a MIMO integrated system according to an embodiment of the present invention, and as shown in fig. 2, a precoding method for a shared transmit array of a MIMO integrated system according to an embodiment of the present invention includes:
step 201, mapping the information bit sequence to be transmitted to each user terminal to a communication symbol sequence, and performing power normalization processing on the communication symbol sequence to obtain a communication symbol vector.
In the embodiment of the invention, information bits to be transmitted to each user terminal are mapped into symbols, the symbols are subjected to power normalization processing, and then the symbols are arranged into corresponding communication symbol vectors for subsequent linear precoding processing.
Step 202, a radar pseudorandom emission sequence is generated through random phase coding, and a corresponding radar emission sequence vector is obtained according to the radar pseudorandom emission sequence.
In the embodiment of the invention, a group of independent radar pseudo-random transmitting sequences are generated through random phase coding and are arranged into corresponding radar transmitting sequence vectors, and then linear pre-coding processing is carried out.
And 203, performing linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
According to the precoding method for the MIMO integrated shared transmitting array, provided by the embodiment of the invention, the array transmitting signals are obtained by performing linear precoding on a group of independent radar pseudo-random transmitting sequences and multi-user communication symbols, so that the orthogonality of the signals transmitted by each array element is ensured, the interference among user terminals is completely eliminated, and meanwhile, the lowest signal-to-interference-and-noise ratio of each user terminal is optimal.
On the basis of the above embodiment, mapping the information bit sequence to be transmitted to each ue to a communication symbol sequence, and performing power normalization processing on the communication symbol sequence to obtain a communication symbol vector, includes:
mapping the information bit sequence to be transmitted to the kth user terminal into a communication symbol sequence ck[n]。
In an embodiment of the invention, the total power P of transmission is giventThe number of user terminals K, the number of array elements M, the number of symbols to be transmitted to each user terminal N, the noise power sigma of the communication receiver2Transmitting the array to the channel matrix of each user terminal
Figure BDA0002511968850000071
Wherein, the k row and m column elements of H represent the channels from the m array element to the k user terminal. Specifically, in the embodiment of the present invention, an information bit sequence to be transmitted to each ue is mapped to a communication symbol sequence by a Quadrature Phase Shift Keying (QPSK) or a Quadrature Amplitude Modulation (QAM).
According to a power normalization formula, obtaining a communication symbol sequence after power normalization processing
Figure BDA0002511968850000072
The power normalization formula is as follows:
Figure BDA0002511968850000081
wherein p iskRepresenting the average power, p, corresponding to the symbol transmitted to the kth user terminalkIs determined based on a coincidence mapping; k is 0, …, K-1, K represents the number of user terminals; n is 0, …, N-1, N represents discrete time, N represents the number of communication symbols to be transmitted to each user terminal;
constructing a K-dimensional communication symbol vector according to the communication symbol sequence after normalization processing:
Figure BDA0002511968850000082
on the basis of the above embodiment, the generating a radar pseudorandom emission sequence by random phase encoding, and obtaining a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence, includes:
acquiring a radar pseudorandom emission sequence through random phase encoding:
Figure BDA0002511968850000083
wherein phi ism[n]Uniform distribution over individual (0, 1); m is 0, …, M-1, M represents the number of array elements;
constructing an M-dimensional radar transmitting sequence vector according to the radar pseudorandom transmitting sequence:
r[n]＝(r0[n],r1[n],…,rM-1[n])T。
on the basis of the foregoing embodiment, before the performing linear precoding processing on the communication symbol vector and the radar transmission sequence vector to obtain a baseband transmission signal sequence sharing a transmission array, the method further includes:
and constructing a precoding matrix according to the total transmission power, the noise power of the communication receiver and a channel matrix from a transmission array to each user terminal, so as to perform linear precoding processing on the communication symbol vector and the radar transmission sequence vector according to the precoding matrix.
On the basis of the above embodiment, the constructing a precoding matrix according to the total transmission power, the noise power of the communication receiver, and the channel matrix from the transmission array to each user terminal includes:
acquiring a covariance matrix R of a received signal of each user terminal according to the total transmission power and a channel matrix from a transmission array to each user terminal:
R＝(Pt/M)HHH；
wherein, PtRepresenting the total transmit power, H represents the channel matrix of the transmit array to each user terminal;
based on the covariance matrix R, the channel matrix H of the transmit array to each user terminal, and the communication receiver noise power σ2Converting the optimization problem into a convex optimization problem:
max t
s.t.pi≥t(Ri,i+σ2),i＝0,1,…,K-1，
Figure BDA0002511968850000091
where t denotes the optimization vector, piRepresenting the ith element in the vector p, optimizing the variables
Figure BDA0002511968850000092
Figure BDA0002511968850000093
Representing the set of all K-dimensional semi-positive definite matrices, diag (p) representing the diagonal matrix constructed from the vector p, Ri,iAn element representing the ith row and ith column of the matrix R;
conjugate transpose H of channel matrix H for transmitting array to each user terminalHQR decomposition to yield:
HH＝Qh[Lh0K×(M-K)]H；
wherein Q ishRepresenting an M-dimensional unitary matrix, LhRepresenting a K-dimensional upper triangular matrix, L in the present embodimenthAll the nonzero diagonal elements of the data are real numbers;
for the optimization vector RfFeature decomposition is performed to obtain a first matrix ΛfAnd a second matrix Pf：
Figure BDA0002511968850000094
Performing Schmidt orthogonalization on each column in the random matrix K × M to obtain a matrix with each row unit being orthogonal, namely obtaining a third matrix U,
Figure BDA0002511968850000095
the third matrix U satisfies UUH＝IKIn which IKRepresenting a K-dimensional identity matrix and passing said first matrix ΛfThe second matrix PfAnd the third matrix U, acquiring a fourth matrix F:
Figure BDA0002511968850000096
Figure BDA0002511968850000097
conjugate transpose F of the fourth matrix FHQR decomposition to yield:
FH＝Qf[Lf0K×M]H；
wherein Q isfRepresenting a (M + K) -dimensional unitary matrix, LfRepresenting a K-dimensional upper triangular matrix, L in the present embodimentfAll the nonzero diagonal elements of the data are real numbers;
according to conjugate transpose HHAnd conjugate transpose FHAnd constructing a precoding matrix W:
Figure BDA0002511968850000098
wherein [ Q ]f]1:MRepresents by QfThe first M columns of (a) form a matrix,
Figure BDA0002511968850000099
on the basis of the foregoing embodiment, the performing linear precoding processing on the communication symbol vector and the radar transmission sequence vector to obtain a baseband transmission signal sequence sharing a transmission array includes:
according to the precoding matrix W, the communication symbol vector c [ n ] and the radar transmission sequence vector r [ n ], an array transmission signal sequence formula is constructed:
Figure BDA0002511968850000101
wherein, s [ n ] represents the m-th term corresponding to the m-th array transmission signal, and in the embodiment of the present invention, the lowest signal to interference plus noise ratio formula of each user terminal is t/(1-t).
And acquiring a baseband transmitting signal sequence of the shared transmitting array according to the array transmitting signal sequence formula.
Fig. 3 is a schematic diagram of a relationship between a minimum received signal-to-interference-and-noise ratio and a transmission signal-to-noise ratio of each user terminal according to an embodiment of the present invention, which can be referred to in fig. 3, and optimizes the minimum received signal-to-interference-and-noise ratio and the transmission signal-to-noise ratio of each user terminal
Figure BDA0002511968850000102
When the number K of the user terminals is 4, the transmission array is a uniform linear equal interval array, and the array element interval is equal to a half wavelength. The channel from the user terminal to the transmitting array element is a direct-view channel, and the directions relative to the transmitting array are-60 degrees, -20 degrees, 0 degree and 30 degrees respectively. As can be seen from fig. 3, under the condition that the number of the user terminals is fixed, increasing the number of the transmission array elements and the transmission signal-to-noise ratio can improve the minimum signal-to-interference-and-noise ratio of each user terminal.
Fig. 4 is a schematic structural diagram of a precoding system for a MIMO integrated system shared transmit array according to an embodiment of the present invention, and as shown in fig. 4, an embodiment of the present invention provides a precoding system for a MIMO integrated system shared transmit array, including a multi-user communication symbol generation module 401, a radar pseudorandom transmit sequence generation module 402, and a MIMO joint precoding module 403, where the multi-user communication symbol generation module 401 is configured to map an information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and perform power normalization processing on the communication symbol sequence to obtain a communication symbol vector; the radar pseudorandom emission sequence generation module 402 is configured to generate a radar pseudorandom emission sequence through random phase coding, and obtain a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence; the MIMO joint precoding module 403 is configured to perform linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence sharing a transmitting array.
According to the precoding system for the MIMO integrated shared transmitting array, provided by the embodiment of the invention, the array transmitting signals are obtained by performing linear precoding on a group of independent radar pseudo-random transmitting sequences and multi-user communication symbols, so that the orthogonality of the signals transmitted by each array element is ensured, the interference among user terminals is completely eliminated, and meanwhile, the lowest signal-to-interference-and-noise ratio of each user terminal is optimal.
On the basis of the above embodiment, the system further includes: and the precoding matrix acquisition module is used for constructing a precoding matrix according to the total transmission power, the noise power of the communication receiver and a channel matrix of a transmission array to each user terminal so as to perform linear precoding processing on the communication symbol vector and the radar transmission sequence vector according to the precoding matrix.
The system provided by the embodiment of the present invention is used for executing the above method embodiments, and for details of the process and the details, reference is made to the above embodiments, which are not described herein again.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and referring to fig. 5, the electronic device may include: a processor (processor)501, a communication Interface (Communications Interface)502, a memory (memory)503, and a communication bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the communication bus 504. The processor 501 may call logic instructions in the memory 503 to perform the following method: mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector; generating a radar pseudorandom emission sequence through random phase coding, and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence; and performing linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
In addition, the logic instructions in the memory 503 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the precoding method for a MIMO-integrated system shared transmit array provided in the foregoing embodiments, for example, the method includes: mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector; generating a radar pseudorandom emission sequence through random phase coding, and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence; and performing linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A precoding method for a shared transmitting array of a MIMO integrated system is characterized by comprising the following steps:
mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence, and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector;
generating a radar pseudorandom emission sequence through random phase coding, and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence;
and performing linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
2. The precoding method for the MIMO integrated system shared transmit array according to claim 1, wherein the mapping of the information bit sequence to be transmitted to each ue to a communication symbol sequence and the power normalization of the communication symbol sequence to obtain a communication symbol vector comprises:
mapping the information bit sequence to be transmitted to the kth user terminal into a communication symbol sequence ck[n]；
According to a power normalization formula, obtaining a communication symbol sequence after power normalization processing
Figure FDA0002511968840000011
The power normalization formula is as follows:
Figure FDA0002511968840000012
wherein p iskRepresenting the average power corresponding to the symbol transmitted to the kth user terminal; k is 0, …, K-1, K represents the number of user terminals; n is 0, …, N-1, N represents discrete time, N represents the number of communication symbols to be transmitted to each user terminal;
according to the communication symbol sequence after normalization processing, a communication symbol vector is constructed:
Figure FDA0002511968840000013
3. the precoding method for the MIMO unified system shared transmit array according to claim 2, wherein the generating a radar pseudorandom transmit sequence by random phase coding and obtaining a corresponding radar transmit sequence vector according to the radar pseudorandom transmit sequence comprises:
acquiring a radar pseudorandom emission sequence through random phase encoding:
Figure FDA0002511968840000014
wherein phi ism[n]Uniform distribution over individual (0, 1); m is 0, …, M-1, M represents the number of array elements;
according to the radar pseudo-random transmitting sequence, constructing a radar transmitting sequence vector:
r[n]＝(r0[n],r1[n],…,rM-1[n])T。
4. the precoding method for sharing the transmit array in the MIMO-integrated system as claimed in claim 3, wherein before the performing the linear precoding on the communication symbol vector and the radar transmit sequence vector to obtain the baseband transmit signal sequence of the shared transmit array, the method further comprises:
and constructing a precoding matrix according to the total transmission power, the noise power of the communication receiver and a channel matrix from a transmission array to each user terminal, so as to perform linear precoding processing on the communication symbol vector and the radar transmission sequence vector according to the precoding matrix.
5. The precoding method for sharing the transmit array of the MIMO integrated system as claimed in claim 4, wherein the constructing the precoding matrix according to the total transmit power, the noise power of the communication receiver and the channel matrix of the transmit array to each ue comprises:
acquiring a covariance matrix R of a received signal of each user terminal according to the total transmission power and a channel matrix from a transmission array to each user terminal:
R＝(Pt/M)HHH；
wherein, PtRepresenting the total transmit power, H represents the channel matrix of the transmit array to each user terminal;
based on the covariance matrix R, the channel matrix H of the transmit array to each user terminal, and the communication receiver noise power σ2Converting the optimization problem into a convex optimization problem:
max t
s.t.pi≥t(Ri,i+σ2),i＝0,1,…,K-1，
R＝diag(p)+Rf,
Figure FDA0002511968840000021
where t denotes the optimization vector, piRepresenting the ith element in the vector p, optimizing the variables
Figure FDA0002511968840000022
Figure FDA0002511968840000023
Representing the set of all K-dimensional semi-positive definite matrices, diag (p) representing the diagonal matrix constructed from the vector p, Ri,iAn element representing the ith row and ith column of the matrix R;
conjugate transpose H of channel matrix H for transmitting array to each user terminalHQR decomposition to yield:
HH＝Qh[Lh0K×(M-K)]H；
wherein Q ishRepresenting an M-dimensional unitary matrix, LhRepresenting a K-dimensional upper triangular matrix;
for the optimization vector RfFeature decomposition is performed to obtain a first matrix ΛfAnd a second matrix Pf：
Figure FDA0002511968840000031
Performing Schmidt orthogonalization processing on each column in the random matrix K × M to obtain a third matrix U,
Figure FDA0002511968840000032
and through the first matrix ΛfThe second matrix PfAnd the third matrix U, acquiring a fourth matrix F:
Figure FDA0002511968840000033
Figure FDA0002511968840000034
conjugate transpose F of the fourth matrix FHQR decomposition to yield:
FH＝Qf[Lf0K×M]H；
wherein Q isfRepresenting a (M + K) -dimensional unitary matrix, LfRepresenting a K-dimensional upper triangular matrix;
according to conjugate transpose HHAnd conjugate transpose FHAnd constructing a precoding matrix W:
Figure FDA0002511968840000035
wherein [ Q ]f]1:MRepresents by QfThe first M columns of (a) form a matrix.
6. The precoding method for sharing the transmit array in the MIMO-integrated system according to claim 5, wherein the performing linear precoding on the communication symbol vector and the radar transmit sequence vector to obtain a baseband transmit signal sequence of the shared transmit array includes:
according to the precoding matrix W, the communication symbol vector c [ n ] and the radar transmission sequence vector r [ n ], an array transmission signal sequence formula is constructed:
Figure FDA0002511968840000036
wherein, s [ n ] represents the m item corresponding to the m array emission signal;
and acquiring a baseband transmitting signal sequence of the shared transmitting array according to the array transmitting signal sequence formula.
7. The precoding method for the MIMO integrated system shared transmit array according to claim 5, wherein the mapping the information bit sequence to be transmitted to each user terminal to a communication symbol sequence comprises:
and mapping the information bit sequence to be transmitted to each user terminal into a communication symbol sequence by a quadrature phase shift keying modulation mode or a quadrature amplitude modulation mode.
8. A precoding system for a MIMO-integrated system shared transmit array, comprising:
the multi-user communication symbol generation module is used for mapping an information bit sequence to be transmitted to each user terminal into a communication symbol sequence and carrying out power normalization processing on the communication symbol sequence to obtain a communication symbol vector;
the system comprises a radar pseudorandom emission sequence generation module, a radar pseudorandom emission sequence generation module and a radar pseudorandom emission sequence generation module, wherein the radar pseudorandom emission sequence generation module is used for generating a radar pseudorandom emission sequence through random phase coding and acquiring a corresponding radar emission sequence vector according to the radar pseudorandom emission sequence;
and the MIMO joint precoding module is used for carrying out linear precoding processing on the communication symbol vector and the radar transmitting sequence vector to obtain a baseband transmitting signal sequence of the shared transmitting array.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the precoding method for a shared transmit array of a MIMO-integrated system as claimed in any one of claims 1 to 7.
10. A non-transitory computer readable storage medium, having stored thereon a computer program, when being executed by a processor, for implementing the steps of the precoding method for a MIMO-integrated system shared transmit array according to any one of claims 1 to 7.
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