Feedback method and device of downlink channel information based on multicode book

Abstract

The invention discloses a feedback method of downlink channel information based on a multi-codebook, wherein a four-antenna basic codebook, an extended codebook and at least an optimized codebook capable of improving the accuracy degree for a code to reflect the downlink channel information are arranged. In the method, UE (User Equipment) selects corresponding code words from the four-antenna codebook which is a basic codebook, the extended codebook and the optimized codebook according to current downlink channel information and feeds back the serial numbers of the selected code words in the codebook per se to a base station; and the base station searches for corresponding code words from the more than two code work serial numbers sent by the UE and works out corresponding code words according to the code words, wherein the code words represent the current downlink channel information. The invention simultaneously discloses a device for realizing the method. The invention can ensure that the base station acquires the downlink channel information with high precision at low cost, thereby effectively optimizing the transmission quality of downlink signals and improving the transmission efficiency of the downlink channel.

Description

technical field [0001] The present invention relates to technical channel information feedback and precoding technology, in particular to a downlink channel information feedback method and device based on multiple codebooks. Background technique [0002] In wireless communication, if both the transmitting end and the receiving end use multiple antennas, spatial multiplexing can be used to obtain a higher rate. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back the channel information to the sending end, and the sending end uses some transmit precoding techniques according to the obtained channel information, which can greatly improve the transmission performance. The simple use method is to directly use the channel feature vector information for precoding, which is mainly used in single-user multiple input multiple output (MIMO, Multiple Input Multiple Output), and there are other better but more complicated met...

AI Technical Summary

Problems solved by technology

[0024] The advantage of the first solution is that it can effectively improve the accuracy of codewords reflecting downlink channel information by using existing adaptive and differential technologies, but it cannot reflect the effective inheritance of the existing 4-antenna codebook of Rel.8

The advantage of the second scheme is that it can effectively inherit the 4-antenna codebook of Rel. Accurate downlink channel information

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