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Method for carrying out channel information feedback by using double codebook and system thereof

A technology of channel information feedback and dual codebook, which is applied in the field of multiple input and multiple output in the field of wireless communication technology, and can solve problems such as inaccurate channel information feedback and inability to correspond

Inactive Publication Date: 2012-04-11
CHINA POTEVIO INFORMATION IND
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Problems solved by technology

In the prior art, since the base station can only select a single precoding codebook, and the single precoding codebook cannot correspond well to the actual channel conditions, resulting in inaccurate channel information feedback

Method used

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  • Method for carrying out channel information feedback by using double codebook and system thereof
  • Method for carrying out channel information feedback by using double codebook and system thereof
  • Method for carrying out channel information feedback by using double codebook and system thereof

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Embodiment Construction

[0048]Relevant research shows that, compared with the codebook scheme based on unitary matrix precoding in the prior art, the Grassmannian codebook scheme can achieve greater performance gain. However, Grassmannian precoding is a non-unitary matrix precoding and does not have a constant model characteristic.

[0049] Consider a M t root transmitting antenna, M r Point-to-point wireless communication system with root receiving antenna. The input signal is first multiplexed into M≤min(M t ,M r ) different sub-streams s, through the precoding matrix F p Perform preprocessing to obtain the actual transmitted signal, and the equivalent baseband signal expression at the receiving end is as follows:

[0050] y=HF p s+v (1)

[0051] Among them, H represents the channel matrix, v represents the noise vector, and the elements of the channel matrix obey the complex normal distribution CN(0, N 0 ), the covariance matrix of the noise vector is N 0 I M .

[0052] When the receivi...

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Abstract

The invention provides a method for carrying out channel information feedback by using double codebook. The method comprises the following steps that: a signal receiver selects a grade-one optimal code word from codebook of a precoding matrix in the prior art; the signal receiver combines channel state information and a function formed by the grade-one optimal code word and selects a grade-two optimal code word from preset grade-two codebook according to a capacity maximum standard; the signal receiver generates feedback information comprising a code word index of the selected grade-one optimal code word and the code word index of the grade-two optimal code word and sends to a signal sender; the signal sender generates the precoding matrix which is a product of the grade-one optimal code word and the grade-two optimal code word according to the received feedback information. The invention also provides a system of carrying out the channel information feedback by using the double codebook. Compared to the channel information feedback method in the prior art, by using the method, the channel information can be fed back accurately.

Description

technical field [0001] The invention relates to multiple-input multiple-output (MIMO) technology in the technical field of wireless communication, in particular to a method and system for channel information feedback by using a dual codebook. Background technique [0002] Precoding technology is to process the data to be sent with a precoding matrix according to the channel information fed back from the receiving side to the sender, so that each data stream is equivalent to a mutually independent channel for transmission during the spatial channel transmission process, so as to achieve multiple receiving The purpose of the antenna to equalize the received signal. [0003] In LTE R8, for two antenna port transmission, that is, antenna port p ∈ {0, 1}, the number of codebooks is 2×2=4, and the precoding matrix W(i) will be selected from Table 1 or a subset thereof . For the closed-loop spatial multiplexing mode defined in LTE R8, when the number of layers υ=2, the codebook i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/16
Inventor 王浩
Owner CHINA POTEVIO INFORMATION IND
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