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CN-122001416-A - Information feedback method and device and related equipment

CN122001416ACN 122001416 ACN122001416 ACN 122001416ACN-122001416-A

Abstract

The application discloses an information feedback method, an information feedback device and related equipment, and belongs to the technical field of communication. The information feedback method comprises the steps of estimating channel state information of a dual-mode channel of a MIMO-PLC system to obtain a first dual-mode channel matrix, selecting N optimal codebook vectors from a pre-stored dual-mode codebook, wherein each optimal codebook vector is a dual-mode codebook vector closest to the space distance of each dual-mode channel vector, the dual-mode codebook is a codebook adapting to the space characteristics of multiple-input multiple-output MIMO and the characteristics of a power line communication PLC medium, generating a first index according to the N optimal codebook vectors, and sending first information to a transmitting end, wherein the first information comprises the first index. The application simplifies the feedback content from a complete channel matrix to a low-bit dual-mode codebook index, and the dual-mode codebook adapts to MIMO space characteristics and PLC medium characteristics, thereby meeting the requirements of a system on the reliability and the instantaneity of CSI feedback.

Inventors

  • MA SHENGGUO
  • WEI BENHAI
  • ZHOU ZHIMEI
  • PAN XIAODONG
  • LIU YUJIA

Assignees

  • 深圳市国电科技通信有限公司

Dates

Publication Date
20260508
Application Date
20251216

Claims (17)

  1. 1. The information feedback method is characterized by being applied to a receiving end and comprising the following steps: Estimating channel state information of a dual-mode channel of a multi-input multi-output power line communication MIMO-PLC system to obtain a first dual-mode channel matrix, wherein the first dual-mode channel matrix comprises N dual-mode channel vectors, one dual-mode channel vector corresponds to a transmitting-receiving antenna pair formed by a single transmitting antenna and a plurality of receiving antennas in the MIMO-PLC system, and N is the number of the transmitting antennas or the transmitting-receiving antenna pairs; Selecting N optimal codebook vectors from a prestored dual-mode codebook, wherein each optimal codebook vector is a dual-mode codebook vector closest to the spatial distance of each dual-mode channel vector, the dual-mode codebook is a codebook adapting to the spatial characteristics of multiple-input multiple-output (MIMO) and the medium characteristics of Power Line Communication (PLC), and the dual-mode codebook comprises a plurality of dual-mode codebook vectors; generating a first index according to the N optimal codebook vectors, wherein the first index is used for indexing channel state information of all dual-mode channels in the MIMO-PLC system in a dual-mode codebook; And sending first information to a transmitting end, wherein the first information comprises the first index.
  2. 2. The method of claim 1, further comprising pre-storing the dual mode codebook; The dual mode codebook is generated by the following steps: Determining basic parameters of the dual-mode codebook, wherein the basic parameters of the dual-mode codebook comprise the size of the dual-mode codebook and the dimension of the dual-mode codebook vector, wherein the size of the dual-mode codebook represents the number of the dual-mode codebook vectors in the dual-mode codebook, and the dimension of the dual-mode codebook vector is the same as the dimension of the dual-mode channel vector; Determining a codebook vector pre-allocation strategy conforming to the characteristics of a PLC medium based on a PLC channel statistical model and an actual measurement sample of a MIMO-PLC dual-mode channel; Based on the measured samples of the MIMO-PLC dual-mode channel and the codebook vector pre-allocation strategy, generating the dual-mode codebook through a residual vector quantization RVQ algorithm, wherein the dual-mode codebook is an RVQ codebook adapting to MIMO space characteristics and PLC medium characteristics.
  3. 3. The method of claim 2, wherein determining a codebook vector pre-allocation policy that meets PLC medium characteristics based on the PLC channel statistical model and MIMO-PLC dual-mode channel measured samples comprises: collecting a plurality of MIMO-PLC dual-mode channel actual measurement samples; dividing the multiple MIMO-PLC dual-mode channel actual measurement samples into channel samples in different channel quality areas based on the PLC channel statistical model and the channel state information of the MIMO-PLC dual-mode channel actual measurement samples, wherein the different channel quality areas comprise a deep attenuation area, a high noise area and a normal area; Determining the codebook vector pre-allocation strategy conforming to the characteristics of the PLC medium for the different channel quality areas.
  4. 4. The method of claim 3, wherein generating the dual mode codebook by a residual vector quantization, RVQ, algorithm based on the MIMO-PLC dual mode channel measured samples and the codebook vector pre-allocation policy comprises: according to the codebook vector pre-allocation strategy, a plurality of initial codebook vectors are randomly generated in the different channel quality areas, wherein the dimension of each initial codebook vector is the same as the dimension of the dual-mode channel vector corresponding to the transmitting-receiving antenna pair; Performing iterative optimization based on the MIMO-PLC dual-mode channel actual measurement samples, wherein each MIMO-PLC dual-mode channel actual measurement sample is allocated to the codebook vector with the closest spatial distance in each round of iterative optimization, and the position of the codebook vector is updated to the centroid of the MIMO-PLC dual-mode channel actual measurement sample; and under the condition that the position change of the codebook vectors is smaller than a set threshold value or the iteration optimization frequency reaches the maximum iteration frequency, obtaining a plurality of the dual-mode codebook vectors in the dual-mode codebook, wherein each dual-mode codebook vector is a codebook vector reflecting the directional characteristic of the MIMO space channel and the frequency selective fading characteristic of the PLC power line channel.
  5. 5. The method according to any one of claims 1-4, wherein estimating channel state information for a dual mode channel of a MIMO-PLC system for multiple-input multiple-output power line communication, to obtain a first dual mode channel matrix, comprises: receiving a first signal, wherein the first signal is a signal of a second signal after passing through a MIMO-PLC dual-mode channel, and the second signal is a first orthogonal training sequence which is transmitted by the transmitting end through N transmitting antennas and is adaptive to the characteristics of a PLC medium; performing denoising and separation related operations on the first signals to obtain N third signals; and estimating the first dual-mode channel matrix based on the first orthogonal training sequence and the N third signals.
  6. 6. The method according to any of claims 1-4, wherein said selecting N optimal codebook vectors among pre-stored dual mode codebooks comprises: traversing each of the dual-mode codebook vectors in the dual-mode codebook, and calculating Euclidean distances between each of the dual-mode codebook vectors and the N dual-mode channel vectors; and selecting N optimal codebook vectors from all the dual-mode codebook vectors, wherein the optimal codebook vectors are the dual-mode codebook vectors with the minimum Euclidean distance with the dual-mode channel vectors.
  7. 7. The method according to any of claims 1-4, wherein the generating a first index from the N optimal codebook vectors comprises one of: Combining indexes of the N optimal codebook vectors in the dual-mode codebook to obtain the first index; And combining indexes of the N optimal codebook vectors in the dual-mode codebook, and encoding the indexes obtained after combination to obtain the first index.
  8. 8. The method according to any one of claims 1-4, further comprising: carrying out channel state information estimation again on the dual-mode channel of the MIMO-PLC system to obtain a second dual-mode channel matrix; calculating a channel matrix difference, the channel matrix difference being a norm of a matrix difference between the second dual-mode channel matrix and the first dual-mode channel matrix; Selecting N new optimal codebook vectors from the prestored dual-mode codebook based on the second dual-mode channel matrix under the condition that the channel matrix difference exceeds a set threshold value, and generating a second index based on the N new optimal codebook vectors; And sending second information to the transmitting end, wherein the second information comprises the second index.
  9. 9. The information feedback method is characterized by being applied to a transmitting end and comprising the following steps: receiving first information from a receiving end, wherein the first information comprises a first index, and the first index is used for indexing channel state information representing all dual-mode channels in a multi-input multi-output power line communication MIMO-PLC system in a dual-mode codebook; And determining a precoding matrix based on a prestored dual-mode codebook and the first information, wherein the dual-mode codebook is a codebook adapting to the space characteristics of the multiple-input multiple-output (MIMO) and the characteristics of a Power Line Communication (PLC) medium, and comprises a plurality of dual-mode codebook vectors.
  10. 10. The method of claim 9, further comprising pre-storing the dual mode codebook; The dual mode codebook is generated by the following steps: Determining basic parameters of the dual-mode codebook, wherein the basic parameters of the dual-mode codebook comprise the size of the dual-mode codebook and the dimension of the dual-mode codebook vector, the size of the dual-mode codebook represents the number of the dual-mode codebook vectors in the dual-mode codebook, the dimension of the dual-mode codebook vector is the same as the dimension of a dual-mode channel vector, and one dual-mode channel vector corresponds to a transmitting-receiving antenna pair formed by a single transmitting antenna and a plurality of receiving antennas in the MIMO-PLC system; Determining a codebook vector pre-allocation strategy conforming to the characteristics of a PLC medium based on a PLC channel statistical model and an actual measurement sample of a MIMO-PLC dual-mode channel; Based on the measured samples of the MIMO-PLC dual-mode channel and the codebook vector pre-allocation strategy, generating the dual-mode codebook through a residual vector quantization RVQ algorithm, wherein the dual-mode codebook is an RVQ codebook adapting to MIMO space characteristics and PLC medium characteristics.
  11. 11. The method according to claim 9 or 10, wherein before receiving the first information from the receiving end, the method further comprises: And transmitting a second signal to a receiving end through N transmitting antennas, wherein the second signal is a first orthogonal training sequence adapting to the characteristics of a PLC medium, and the first orthogonal training sequence is used for the receiving end to estimate channel state information of a dual-mode channel of the MIMO-PLC system.
  12. 12. The method according to claim 9 or 10, wherein said determining a precoding matrix based on a pre-stored dual mode codebook and said first information comprises: determining, based on the first information, a combination of indexes of N optimal codebook vectors in the dual-mode codebook; determining the N optimal codebook vectors based on the combination of the indexes and the dual mode codebook; and generating a precoding matrix according to the N optimal codebook vectors.
  13. 13. The method of claim 12, wherein the determining, based on the first information, a combination of indexes of the N optimal codebook vectors in the dual mode codebook comprises one of: analyzing the first information to obtain the combination of the indexes; and analyzing the first information, and decoding a result obtained after analysis to obtain the combination of the indexes.
  14. 14. The method according to claim 9 or 10, characterized in that the method further comprises: transmitting a fourth signal to a receiving end through N transmitting antennas, wherein the fourth signal is a second orthogonal training sequence adapting to the characteristics of a PLC medium, and the second orthogonal training sequence is used for the receiving end to perform channel state information estimation on a dual-mode channel of the MIMO-PLC system again; receiving second information from a receiving end, wherein the second information comprises a second index, and the second index is used for representing updated channel state information of all dual-mode channels of the MIMO-PLC system; and determining the updated precoding matrix based on the second index and the dual-mode codebook.
  15. 15. An information feedback apparatus, comprising: The first processing module is used for estimating channel state information of a dual-mode channel of the MIMO-PLC system to obtain a first dual-mode channel matrix, wherein the first dual-mode channel matrix comprises N dual-mode channel vectors, one dual-mode channel vector corresponds to a transmitting-receiving antenna pair formed by a single transmitting antenna and a plurality of receiving antennas in the MIMO-PLC system, and N is the number of the transmitting antennas or the transmitting-receiving antenna pairs; The first processing module is further configured to select N optimal codebook vectors from a prestored dual-mode codebook, where each optimal codebook vector is a dual-mode codebook vector closest to a spatial distance of each dual-mode channel vector, and the dual-mode codebook is a codebook adapted to spatial characteristics of multiple-input multiple-output MIMO and characteristics of PLC media for power line communication, and the dual-mode codebook includes a plurality of dual-mode codebook vectors; the first processing module is further configured to generate a first index according to the N optimal codebook vectors, where the first index is used to index channel state information that indicates all dual-mode channels in the MIMO-PLC system in a dual-mode codebook; And the first transceiver module is used for sending first information to the transmitting end, wherein the first information comprises the first index.
  16. 16. An information feedback apparatus, comprising: The second transceiver module is used for receiving first information from a receiving end, wherein the first information comprises a first index, and the first index is used for indexing channel state information which represents all dual-mode channels in the MIMO-PLC system in a dual-mode codebook; And the second processing module is used for determining a precoding matrix based on a prestored dual-mode codebook and the first information, wherein the dual-mode codebook is a codebook adapting to the MIMO space characteristic and the PLC medium characteristic, and comprises a plurality of dual-mode codebook vectors.
  17. 17. A communication device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, performs the steps of the information feedback method of any of claims 1 to 8, or performs the steps of the information feedback method of any of claims 9 to 14.

Description

Information feedback method and device and related equipment Technical Field The present application belongs to the field of communications technologies, and in particular, to an information feedback method, an information feedback device, and related devices. Background The core of the multiple-input multiple-output power line communication (Multiple input Multiple output Power Line Communication, MIMO-PLC) technology is a dual-mode fusion of the multiple-input multiple-output (Multiple input Multiple output, MIMO) multiple-antenna spatial characteristics with the power line transmission characteristics of the power line communication (Power Line Communication, PLC). Accurate acquisition and efficient feedback of channel state Information (CHANNEL STATE Information) are important for a transmitting end to pertinently adjust MIMO precoding strategies and optimize PLC signal modulation modes so as to achieve the maximization of dual-mode performance. The existing codebook is designed only aiming at a single scene of the wireless MIMO or single-input single-output (Single Input Single Output, SISO) PLC, cannot adapt to the dual-mode requirement of the MIMO-PLC, so that the accuracy of CSI feedback is low, and the bandwidth occupation amount in the MIMO-PLC system is large due to direct feedback of a channel matrix, contradicts the characteristic of quick update of a PLC channel, the feedback delay is high, and the real-time adjustment requirement of the dual-mode system cannot be matched. CSI feedback is performed based on the dual-mode characteristics of the MIMO-PLC, and the problems of dual-mode codebook compatibility deficiency and feedback overhead and real-time imbalance exist. Disclosure of Invention The embodiment of the application provides an information feedback method, an information feedback device and related equipment, which can solve the problems of dual-mode codebook compatibility deficiency, feedback overhead and real-time imbalance existing in the CSI feedback based on the dual-mode characteristics of MIMO-PLC in the related technology. In a first aspect, an information feedback method is provided, which is executed by a receiving end, and the method includes: Estimating channel state information of a dual-mode channel of a multi-input multi-output power line communication MIMO-PLC system to obtain a first dual-mode channel matrix, wherein the first dual-mode channel matrix comprises N dual-mode channel vectors, one dual-mode channel vector corresponds to a transmitting-receiving antenna pair formed by a single transmitting antenna and a plurality of receiving antennas in the MIMO-PLC system, and N is the number of the transmitting antennas or the transmitting-receiving antenna pairs; Selecting N optimal codebook vectors from a prestored dual-mode codebook, wherein each optimal codebook vector is a dual-mode codebook vector closest to the spatial distance of each dual-mode channel vector, the dual-mode codebook is a codebook adapting to the spatial characteristics of multiple-input multiple-output (MIMO) and the medium characteristics of Power Line Communication (PLC), and the dual-mode codebook comprises a plurality of dual-mode codebook vectors; generating a first index according to the N optimal codebook vectors, wherein the first index is used for indexing channel state information of all dual-mode channels in the MIMO-PLC system in a dual-mode codebook; And sending first information to a transmitting end, wherein the first information comprises the first index. In the above technical solution, a receiving end performs channel state information estimation on a dual-mode channel of a MIMO-PLC system, and obtains a first dual-mode channel matrix. Based on the dual-mode channel vectors in the first dual-mode channel matrix, selecting the dual-mode channel vector closest to the spatial distance of each dual-mode channel vector in a pre-stored dual-mode codebook as an optimal codebook vector. The prestored dual-mode codebook is a codebook adapting to the spatial characteristics of MIMO and the characteristics of PLC media, and correspondingly, the selected optimal codebook vector is also adapted to the spatial characteristics of MIMO and the characteristics of PLC media, so that the spatial adaptation requirement of MIMO can be met, the channel anti-interference requirement of PLC can be met, the more accurate CSI quantization effect than that of the traditional single-mode codebook can be obtained, the precoding accuracy can be improved, and the throughput and the transmission reliability of the system can be improved. Generating a first index according to indexes of the N optimal codebook vectors in the dual-mode codebook, and sending first information to a transmitting terminal, wherein the first information comprises the first index. The first index is used to index channel state information in a dual mode codebook that represents all dual mode channels in the MIMO-PLC system. The feedba