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Method, device and system for channel information feedback

A channel information feedback and information feedback technology, which is applied in the transmission system, radio transmission system, diversity/multi-antenna system, etc., can solve problems such as the inability to meet the feedback accuracy requirements of multi-user systems, and achieve reduced feedback volume and high feedback accuracy , the effect of strong time correlation

Inactive Publication Date: 2013-09-25
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a method, device and system for channel information feedback, which solves the problem that the codebook-based implicit feedback method cannot meet the feedback accuracy requirements of a multi-user system

Method used

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  • Method, device and system for channel information feedback
  • Method, device and system for channel information feedback

Examples

Experimental program
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Embodiment 1

[0037] Such as figure 1 As shown, on the one hand, the embodiment of the present invention provides a channel information feedback method, which can be applied to the sending end of the feedback link, including:

[0038] 101. Acquire a channel matrix.

[0039] 102. Select a first codeword from a preset codebook according to the channel matrix and the first reference matrix.

[0040] Wherein, the codebook includes a plurality of codewords arranged according to serial numbers, the plurality of codewords are matrices for quantizing the variation between the main eigenmatrix of the channel matrix and the first reference matrix, and the main The characteristic matrix is ​​the effective channel information required when the link receiving end calculates the precoding matrix.

[0041] As an implementation, the step 102 can be implemented in the following manner: according to the channel matrix and the first reference matrix, using the maximum power gain as a standard to select the ...

Embodiment 2

[0055] In order to enable those skilled in the art to better understand the channel information feedback method provided by the embodiment of the present invention, the method is now described in detail. In this embodiment, the channel information feedback method is applied to a multi-user MIMO system, and the system is provided with N t Send N r receiving antenna configuration, the MIMO channel of the system experiences frequency-flat Rayleigh fading, and in a time block T Blk (or during a channel information feedback process) remains unchanged. Such as image 3 As shown, specifically, the channel information feedback method provided by the embodiment of the present invention includes:

[0056] 301. The user equipment acquires a channel matrix.

[0057] In this embodiment, the channel matrix is ​​an N composed of channel fading coefficients between antenna pairs t *N r random matrix H(t). In the tth time block, the fading coefficient of the propagation path from the tr...

Embodiment 3

[0085] In order to enable those skilled in the art to better understand the method for feeding back channel information provided by the embodiment of the present invention, the method is now described in detail. In this embodiment, the method for feeding back channel information is applied to a multi-user MIMO system, and the system is provided with N t Send N r receiving antenna configuration, the MIMO channel of the system experiences frequency-flat Rayleigh fading, and in a time block T Blk remain unchanged. Such as Figure 5 As shown, specifically, the method for feeding back channel information provided by the embodiment of the present invention includes:

[0086] 501. The user equipment acquires a channel matrix.

[0087] The specific implementation manner of the step 501 is the same as that of the above step 301, and will not be repeated here.

[0088] 502. According to the channel matrix and the first reference matrix, the user equipment selects the first codeword...

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Abstract

The invention discloses a method, device and system for channel information feedback and relates to the technical field of communication. The method for the channel information feedback is provided by the embodiment and includes the steps that channel matrixes are obtained by a feedback link transmitting end; a first code word is selected from a codebook through the feedback link transmitting end according to the channel matrixes and a first reference matrix; the serial number of the first code word is sent to a feedback link receiving end through the feedback link transmitting end. The method, device and system for the channel information feedback can be applied to scenarios, such as a wireless channel and a channel on adjacent subcarriers in a MIMO-OFDM system, with slow channel changing, and the high-precision channel information feedback can be achieved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, device and system for channel information feedback. Background technique [0002] In the follow-up evolution (Long Term Evolution-Advanced , hereinafter referred to as LTE-A) system, the codebook-based implicit feedback scheme is gradually developed in the research of single-user MIMO system. Its basic feature is that after the user equipment selects the precoding matrix, the precoding The coding matrix is ​​fed back to the base station. In a single-user MIMO system, multiple data streams belong to the same user, and the purpose of channel information feedback is to help the base station to achieve precoding, so that the base station can avoid the characteristic direction of deep fading in the wireless channel through precoding, and obtain a good propagation gain, and the mutual interference of multiple data streams can be eliminated by receiving proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
CPCH04B7/0619
Inventor 朱鹏程李元杰
Owner HUAWEI TECH CO LTD
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