Channel Feedback Method for Millimeter Wave Systems Based on Tensor Parallel Compression

Abstract

The present invention discloses a millimeter wave system channel feedback method based on tensor parallel compression. The terminal uses tensor parallel compression technology to compress the channel state information tensor into several tensors of the same size; 3. The receiver uses CANDECOMP / PARAFAC (CP) decomposition to decompose the above compressed tensors respectively, and obtains The factor matrix is ​​fed back to the transmitting end through the uplink feedback link; 4. The transmitting end restores the factor matrix of the original channel state information tensor according to the factor matrix currently fed back to the transmitting end, and reproduces the factor matrix obtained by restoring To construct the original channel state information, the present invention utilizes the high-dimensional characteristics of the millimeter-wave MIMO-OFDM channel, uses a high-order tensor model combined with tensor parallel compression technology, does not require the sparse characteristics of the downlink channel, and can effectively ensure feedback accuracy. Reduce feedback overhead.

Description

technical field [0001] The invention relates to the technical field of channel feedback in a communication system, in particular to a method for channel feedback of a millimeter wave system based on tensor parallel compression. Background technique [0002] As a new-generation mobile communication standard, 5G needs to substantially improve speed and other functions compared to 4G to meet users' needs for a higher quality experience. Compared with the 4G network, the system capacity of the 5G network needs to be increased by 1000 times, the energy efficiency and data rate need to be increased by 10 times, and the average cell throughput needs to be increased by 25 times. The rapid growth of data rates requires 5G to provide greater bandwidth and ultra-low latency, which cannot be achieved through the simple evolution of current wireless technologies. Frequency bands used by current mobile systems are concentrated below 6 GHz. These frequency bands have good transmission co...

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide a millimeter wave system channel feedback method with tensor parallel compression, which can reduce the feedback overhead on the premise of ensuring the accuracy of channel feedback, and effectively solve the problem of antenna delay in the millimeter wave MIMO-OFDM system. The increase in the number of channels and the number of subcarriers leads to the problem of excessive channel feedback overhead

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