Method and device for wireless communication

Abstract

The application relates to a method and a device for wireless communication. The application provides a wireless communication method applied to a user terminal side. The method comprises the following steps: acquiring a vertical differential codebook and a horizontal differential codebook at a current moment based on a vertical codeword vector and a horizontal codeword vector at a previous moment; and selecting the vertical codeword vector and the horizontal codeword vector at the current moment from the vertical differential codebook and the horizontal differential codebook at the current moment respectively based on channel state information at the current moment. The application also provides a wireless communication method applied to a base station side. The wireless communication method comprises the following steps: receiving index information from a user terminal; restoring the vertical codeword vector and the horizontal codeword vector at the current moment corresponding to the index information from a vertical codebook and a horizontal codebook at the current moment; and calculating a vertical differential codebook and a horizontal differential codebook at a next moment based on the vertical codeword vector and the vertical codeword vector at the current moment.

Description

Technical field [0001] This application generally relates to the field of communication, and more specifically, to methods and devices for wireless communication. Background technique [0002] Multiple Input Multiple Output (MIMO) technology uses spatial dimensions to transmit multiple data streams at the same time to improve the capacity of the system, and this is mainly because the channel direction information (CDI) plays an indispensable role. Spatial multiplexing is an important aspect of enhanced MIMO, which can provide high spectral efficiency. When the transmitting end can obtain reliable channel information, linear precoding can be used to achieve spatial multiplexing. Linear precoding requires complete channel state information, first-order statistical information, or second-order statistical information. The acquisition of this information is difficult to achieve in a frequency division duplex (FDD) system, and by providing a pre-designed precoding codebook set, at t...

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

Images