Method and system for realizing cooperative precoding

Abstract

The invention provides a method and system for realizing cooperative precoding aiming at the problem in a cooperative precoding technology among downlink base stations of a current time division duplexing (TDD) system. On the one hand, a channel estimation method based on linear interpolation is adopted to greatly reduce unmatched codebook errors of a receiving end and a base station end under an actual channel environment in the TDD system; and on the other hand, a scheme of two sets of codebooks is adopted to reduce the feedback quantity of cooperative multipoint (CoMP) local precoding, intensify the synchronization among the base stations, and greatly improve the communication quality for users at the edges of a cell at the same time of reducing the feedback quantity.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and system for realizing cooperative precoding (precoding). Background technique [0002] In the 3G LTE-Advanced system, the coordinated multi-point (CoMP) transmission technology can be used to combine several cell nodes to cover the joint part of the cell at the same time, so as to improve the performance of the cell edge. CoMP technology is similar to traditional distributed antenna technology, but the design of distributed antenna is based on the specific actual engineering form, rather than the concept of technical level. CoMP is defined from a technical point of view. Antenna sites connected by optical fibers are coordinated to serve users, and several adjacent antenna stations or nodes serve a user at the same time, thereby increasing the data rate of users. The main problem of the traditional network topology is that there is interference and degradation of cov...

AI Technical Summary

Problems solved by technology

The main problem of the traditional network topology is: there is interference and degradation of coverage quality at the junction of the base station, resulting in poor performance of the terminal in the handover area

However, in the actual TDD system, because the internal channels of the transceiver cannot be completely consistent, the uplink and downlink channels often have certain differences.

Therefore, obtaining downlink precoding directly from the uplink channel will bring a large performance loss

Although the codebook-based precoding algorithm brings quantization loss, since the number of codewords in the codebook is limited and there is a certain distance between codewords, even if the channel information obtained by the base station and the terminal is different , still very likely to choose the same codeword

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