Method and system for realizing cooperative precoding

A precoding and synchronous code technology, applied in the field of collaborative precoding, can solve problems such as drop, difference between uplink and downlink channels, and internal channels of transceivers that cannot be completely consistent.

Inactive Publication Date: 2011-07-20
ZTE CORP
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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, obta

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  • Method and system for realizing cooperative precoding

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Embodiment Construction

[0039] In practical applications, in a multi-cell edge user environment, in order to reduce the code word matching error caused by the internal channel inconsistency of the transceiver in the actual TDD system, and at the same time strengthen the diversity gain brought about by the coordination between base stations, reduce the amount of feedback, and improve the edge To improve the call quality of users, a new local precoding method based on two sets of codebooks can be proposed by combining the TDD system precoding technology and the cooperative precoding technology between downlink base stations. Cell edge users can accept two or three base stations to serve them at the same time. The user end adopts the channel estimation technology based on linear interpolation, which can reduce the code word mismatch error between the receiving end and the base station end under the actual channel environment of the TDD system, and Improve the channel capacity of codebook-based precoding ...

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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...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L25/02
CPCH04B7/0639H04L25/0398H04L25/0258H04L5/1469H04L25/0248H04W24/10H04L25/03904H04L25/0232H04B7/024H04L25/03955
Inventor 张鸿涛张禹强隋成良王晓湘
Owner ZTE CORP
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