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Generalized grasman code book feedback method

A Grassmann codebook, generalized technology, applied in the field of feedback of generalized Grassmann codebook

Active Publication Date: 2010-12-29
SHANGHAI RES CENT FOR WIRELESS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alternating projection algorithm is often used to design isometric frame codebooks, and the complexity of this method will be very high for a large search space

Method used

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  • Generalized grasman code book feedback method

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Embodiment Construction

[0052] In the formula, n ∈ C M r is an additive noise vector, assumed to be independent and identically distributed complex Gaussian noise, where the variance of each item is σ 2 . The matrix G is used to equalize the received signal. After the equalized signal is demodulated, deinterleaved, and decoded, an output bit stream is finally obtained.

[0053] Because the precoding matrix F is determined in the receiver and fed back from the receiver to the transmitter via a limited-bandwidth feedback channel, a codebook-based precoding matrix feedback method is usually used.

[0054] The embodiment of the present invention provides a generalized Grassmann codebook construction method, namely:

[0055] First, the complex Grassmann codebook is used as the mother codebook, and the real Grassmann codebook is used as the parent codebook;

[0056] Then, using each codeword in the parent codebook to perf...

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Abstract

The invention provides a generalized Grassmann codebook construction method and a feedback method based on the construction method. First, the method takes a complex Grassmann codebook as a mother codebook, and takes a real Grassmann codebook as a father codebook; then, the method uses all code characters in the father codebook to extend and transform code characters in the mother codebook to create son codebooks; finally, the mother codebook and all the son codebooks form a generalized Grassmann codebook. The method simplifies the design of the codebook, can construct a codebook with needed size flexibly, and can lower the requirement on a memorizer greatly. In addition, the invention provides an effective feedback method based on the pre-coding matrix of the generalized Grassmann codebook. Firstly, the feedback method transforms the quantification of the pre-coding matrix into the individual quantification of all column vectors in the pre-coding matrix; then, the feedback method uses the generalized Grassmann codebook to quantify all the vectors and feed the quantified vectors back to a transmitter. The feedback method solves the effective feedback problem of the pre-coding matrix, and is applicable to the quantification and feedback for the pre-coding matrixes and beams in all closed-loop multi-antenna systems to form the vectors.

Description

technical field [0001] The present invention relates to a precoding matrix (or beamforming vector) feedback method and a codebook construction method in a precoding multi-antenna communication system, and is applied to a new generation of mobile communication systems using multi-antenna technology, such as B3G (Beyond 3rd Generation) / 4G . Background technique [0002] In recent years, communication systems that use multiple antennas (MIMO) at the transmitter and receiver at the same time have received great attention, because compared with traditional single-antenna communication systems, multi-antenna communication systems can greatly improve data transmission rates and It will become a key technology in the new generation of mobile communication system. Among them, space-division multiplexing and space-time coding are two commonly used multi-antenna technologies. Among the two multi-antenna technologies, the one that does not require channel state information (channel s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/04H04L1/00H04L25/49
Inventor 易辉跃周志刚张小东周霁婷郭海友
Owner SHANGHAI RES CENT FOR WIRELESS TECH