Method, device and system for channel information feedback

A channel information feedback and information feedback technology, applied in transmission systems, radio transmission systems, diversity/multi-antenna systems, etc., can solve the problem of inability to meet the requirements of feedback accuracy of multi-user systems, and achieve reduced feedback and strong time correlation. The effect of stability and high feedback accuracy

Inactive Publication Date: 2016-06-22
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
  • Method, device and system for channel information feedback

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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

Disclosed are a channel information feedback method, apparatus, and system, relating to the technical field of communications. An embodiment of the present invention provides a channel information feedback method, comprising: a feedback link sending end obtaining a channel matrix; the feedback link sending end selecting a first codeword from a codebook according to the channel matrix and a first reference matrix; and the feedback link sending end sending the sequence number of the first codeword to a feedback link receiving end. The channel information feedback method, apparatus, and system provided by the embodiments of the present invention can be applied in a scenario of a slow channel change, for example, a radio channel, a channel on an adjacent sub-carrier in a MIMO-OFDM system, and the like, and can implement high-precision channel information feedback.

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 long-term evolution (LongTermEvolution-Advanced, hereinafter referred to as LTE- A) In the system, the codebook-based implicit feedback scheme is gradually developed in the research of single-user MIMO systems. Its basic feature is that the user equipment selects the precoding matrix and then feeds back the precoding matrix 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 processing (s...

Claims

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Application Information

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