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Multi-aerial radio communication system high efficiency feedback method based on tree code book

A wireless communication system and tree code technology, applied in the field of self-adaptation, can solve problems such as redundant feedback

Active Publication Date: 2011-07-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above codebook design methods only consider the spatial correlation of the channel. For channels that actually have time correlation, the feedback amount is still redundant.

Method used

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  • Multi-aerial radio communication system high efficiency feedback method based on tree code book
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  • Multi-aerial radio communication system high efficiency feedback method based on tree code book

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Embodiment Construction

[0041] The present invention provides a method for limited feedback based on a tree codebook in a multi-antenna system, and its specific implementation is as follows:

[0042] Step 1. Construct a tree-structured codebook at the sending end and the receiving end;

[0043] Split the vector center of the entire vector space, and use the GLA (Generalized Lloyd Algorithm) method to divide the vector space into two, and the vector centers of the two newly generated sub-vector spaces are used as the first-level codebook, and the vectors in the codebook are called These codewords can be split again in the same way, so that they are gradually split until the required number of codebook vectors. figure 2 Shown is a 3-level tree codebook.

[0044] Step 2, obtaining the expression of the optimal beamforming vector at the receiving end;

[0045] figure 1 Shown is the structural block diagram of the multi-antenna finite feedback system. At the receiving end, according to the criterion o...

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Abstract

Disclosed is a multi-antenna wireless communication system high-efficiency feedback method based on a tree codebook and the time relevancy of the real channel; firstly, a codebook with the tree structure is constructed between a sender and a receiver; and then the expression of the optimal beam forming vector is obtained on the receiver according to the criterion of maximization output SNR; the optimal beam forming vector is processed with quantization according to the expression and the tree structure of the tree codebook; the increment obtained after the quantization is sent to the sender as feedback; the sender selects the corresponding codeword as beam forming vector according to the feedback information. The feedback of the traditional limited feedback system has the same bit number in each feedback operation and the feedback quantity is determined by the size of the codebook; the multi-antenna wireless communication system high-efficiency feedback method uses the time relevancy of the channel and obtains the same system performance as that in the traditional proposal through lower feedback quantity.

Description

technical field [0001] The invention relates to an adaptive technology of a wireless mobile communication system, in particular to a feedback method in a multi-antenna limited feedback system. Background technique [0002] With the continuous progress of the times, people's demand for information is increasing. Due to its superiority in improving system capacity and increasing system diversity, multi-antenna technology has attracted more and more attention, and has been widely used in third-generation (3G) and fourth-generation (4G) mobile communication systems. [0003] Space-time coding and beamforming are two main methods to improve system diversity. In comparison, beamforming is better at improving bit error rate performance due to the utilization of channel information. The channel information is used for beamforming at the transmitting end, and the maximum ratio combining at the receiving end can obtain the maximum diversity degree. In a Time Division Duplex (TDD, T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04L1/06
Inventor 高西奇丁律江彬
Owner HUAWEI TECH CO LTD