Channel state information feedback method and device, and information transmission method and device

Abstract

The invention discloses a method and device for feeding back channel state information and an information transmission method and device. The feedback method comprises the following steps: receiving a first pilot signal and performing channel estimation to obtain a first channel estimation value, and receiving a second pilot signal and performing channel estimation to obtain a second channel estimation value; determining first channel state information and second channel state information; feeding back the first channel state information and the second channel state information; receiving a third pilot signal and performing channel estimation to obtain a third channel estimation value; determining third channel state information; feeding back the third channel state information. According to the method and the device, relatively accurate channel state information can be obtained by sending and calculating the pilot signals for multiple times, so that a proper transmission mode can be used for data transmission in a subsequent process and the transmission efficiency and quality are improved.

Description

technical field [0001] The present invention relates to the field of wireless communication engineering, and in particular, relates to a channel state information feedback method and device, and an information transmission method and device. Background technique [0002] The Long Term Evolution (LTE for short) Rel-8 system introduces a closed-loop precoding technology to improve spectrum efficiency. Closed-loop precoding first requires both the base station and the terminal to store the same set of precoding matrices, which is called a codebook. [0003] In order to obtain channel information, the terminal in the LTE Rel-8 system receives the common pilot of the cell and performs channel estimation. In the LTE-A Rel-10 system, the terminal receives the CSI-RS and performs channel estimation. After estimating the channel information, a precoding matrix is ​​selected from the codebook according to certain criteria. The selected criteria can be maximizing the amount of mutua...

AI Technical Summary

Problems solved by technology

[0016] Aiming at the problem that the overall RI calculated in the related art is not accurate enough, leading to the problem that the transmission efficiency is adversely affected, the present invention proposes a channel state information feedback method and device, and an information transmission method and device, which can avoid directly transferring the vertical channel state information The product of the RI in the RI and the RI in the horizontal channel state information is directly determined as the overall RI, but the appropriate channel state information is obtained through multiple pilot calculations and reported, which helps to improve the efficiency and quality of subsequent data transmission

Images