Method and device for wireless communication

Abstract

The present application relates to methods and devices for wireless communications. This application provides a wireless communication method used on the user terminal side, including: based on the vertical codeword vector and horizontal codeword vector at the previous moment, obtaining the vertical differential codebook and horizontal differential codebook at the current moment; and based on the current For the channel state information at the moment, the vertical codeword vector and the horizontal codeword vector at the current moment are respectively selected from the vertical differential codebook and the horizontal differential codebook at the current moment. The present application also provides a wireless communication method used on the base station side, including: receiving index information from the user terminal; recovering the vertical codeword corresponding to the index information at the current moment from the vertical codebook and the horizontal codebook at the current moment vector and the horizontal codeword vector; and based on the vertical codeword vector and the horizontal codeword vector at the current moment, calculate the vertical differential codebook and the horizontal differential codebook at the next moment.

Description

technical field [0001] The present application relates generally to the field of communications, and more particularly to methods and devices for wireless communications. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology utilizes the spatial dimension to simultaneously transmit multiple data streams to improve system capacity, and this is mainly due to the indispensable role of Channel Direction Information (CDI). Spatial multiplexing is an important aspect of enhanced MIMO, which can provide high spectral efficiency. When reliable channel information can be obtained at the sending end, spatial multiplexing can be realized through linear precoding. Linear precoding requires complete channel state information, first-order statistics or second-order statistics. It is difficult to obtain these information in the frequency division duplex (FDD) system, but by providing a pre-designed precoding codebook set, at the receiving end according to the est...

AI Technical Summary

Problems solved by technology

When there is no time correlation in the channel, the fixed 3D-DFT codebook can show better adaptability to the 3D channel; and when the channel has time correlation, the fixed 3D-DFT codebook is Inaccurate quantization issues when quantizing 3D channels

At the same time, the Grassmann Linear Packing (GLP) codebook performs poorly in non-IID Rayleigh fading channels, while the discrete Fourier transform (DFT) codebook and adaptive codebook based on channel statistics information perform poorly in non-IID Rayleigh fading channels Poor performance in spatially correlated channels

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