Channel state information feedback method and device and precoding matrix determination method and device

Abstract

The invention discloses a channel state information feedback method, a precoding matrix determination method and a precoding matrix determination device. In the application, a terminal determines a beam corresponding to each antenna port group of a base station, and the antenna ports of the base station are divided into a plurality of antenna port groups; the terminal determines at least one synthetic beam used by the equivalent antenna port in each polarization direction according to the channel measurement information and the beam corresponding to each antenna port group; the terminal determines a linear combination coefficient used for constructing precoding corresponding to each layer in a precoding matrix according to the beam corresponding to each antenna port group and at least onesynthetic beam used by the equivalent antenna port in each polarization direction; and the terminal feeds back channel state information to the base station, wherein the channel state information comprises indication information of a beam corresponding to the antenna port group, indication information of at least one synthetic beam used by the equivalent antenna port, and partial or all linear combination coefficients in the linear combination coefficients.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel state information feedback method, a method and a device for determining a precoding matrix. Background technique [0002] Two types of codebooks are defined in the new radio (new radio, NR) system: Type I codebook (Type I) and Type II codebook (Type II). Among them, the Type I codebook is based on beam selection and phase adjustment, its feedback overhead is small, and the quantization accuracy of the channel is low; the Type II codebook is based on the linear combination of orthogonal beams, its feedback overhead is large, and it has high channel quantization precision. [0003] The Type II codebook is based on the method of linearly combining the beams in the orthogonal beam group, and supports the rank1 codebook and the rank2 codebook. Wherein, rank1 indicates that the rank of the transmission channel is equal to 1, indicating that one data ...

AI Technical Summary

Problems solved by technology

When the number of orthogonal beams L is large, the channel state information feedback overhead is large and occupies more uplink resources

Images