Channel state information feedback method and related device

Abstract

The present invention discloses a channel state information feedback method and a related device. The objective of the invention is to solve problems that a wave beam selection range of a second-levelcodebook is limited and system performances are influenced caused by adding antenna ports and reducing a coverage range of a first-level codebook. The method comprises the steps that: a terminal determines a first precoding matrix, determines indication information of wave beam subgroups of the first precoding matrix, and determines a second precoding matrix corresponding to the indication information of the wave beam subgroups, wherein each direction of polarization expressed by the first precoding matrix comprises L wave beam subgroups, each wave beam subgroup comprises M wave beam vectors,and wave beam subgroups indicated by the indication information of the wave beam subgroup belong to the first precoding matrix; and the terminal feeds back channel state information to a base station, wherein the channel state information at least comprises the indication information of the first precoding matrix and the indication information of the second precoding matrix.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a channel state information feedback method and related equipment. Background technique [0002] In a multi-antenna system based on linear precoding, the receiver selects an appropriate precoding matrix from a pre-defined set of precoding matrices according to channel information, and feeds back the index of the selected precoding matrix in the set to the transmitter , this set is called a codebook. The transmitter determines the corresponding precoding matrix according to the received index, and uses the determined precoding matrix to properly preprocess the transmitted signal, so as to improve the effectiveness and reliability of information transmission. A codebook is a necessary element to enable this process. The codebook design needs to match the channel distribution characteristics as much as possible and minimize the performance loss caused by codebook quantizatio...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a channel state information feedback method and related equipment, which are used to solve the problem that the beam selection range of the second-level codebook is limited due to the increase of antenna ports and the smaller coverage area of ​​the first-level codebook, which affects the system. performance problem

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