Millimeter wave system channel feedback method based on tensor parallel compression

Abstract

The invention discloses a millimeter wave system channel feedback method based on tensor parallel compression, and the method comprises the steps: 1, enabling a receiving end to obtain the current downlink channel state information, and then modeling the channel state information into a high-order tensor form; 2, enabling the receiving end to compress the channel state information tensor into a plurality of tensors with the same size by using a tensor parallel compression technology; 3, enabling the receiving end to decompos the compressed tensors through CANDECOMP / PARAFAC (CP) decomposition,and feeding back an obtained factor matrix to the transmitting end through an uplink feedback link; and 4, enabling the transmitting end to recover the factor matrix of the tensor of the original channel state information according to the factor matrix currently fed back to the transmitting end, and reconstructing the original channel state information through the recovered factor matrix. According to the invention, the high-dimensional characteristic of a millimeter wave MIMO-OFDM channel is utilized, and a high-order tensor model is combined with a tensor parallel compression technology, sparse characteristics of a downlink channel are not needed, and the feedback overhead can be effectively reduced under the condition that the feedback precision is ensured.

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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