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Channel information feedback method and system

A technology of channel information feedback and feedback matrix, which is applied in the field of channel information feedback methods and systems, can solve problems such as increasing system complexity, and achieve the effects of reducing system complexity, reducing the amount of feedback, and reducing the number

Inactive Publication Date: 2012-12-05
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the CoMP system, because the codebook of each cell needs to be jointly optimized and searched, the system complexity is greatly increased

Method used

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  • Channel information feedback method and system

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Experimental program
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Effect test

Embodiment 1

[0084] The specific format of the feedback matrix is ​​as follows:

[0085] V=【V 1 , V 2 ,...,V N 】 (18)

[0086] where V 1 is the channel information feedback matrix from the terminal to the first cooperative base station, V 2 is the channel information feedback matrix from the terminal to the second cooperative base station, V N is the channel information feedback matrix from the terminal to the Nth coordinated base station. Each channel information feedback matrix can use the same feedback format as that of a single cell, that is, use the same quantization method as in formula (17).

Embodiment 2

[0088] The specific format of the feedback matrix is ​​as follows:

[0089] V=【V 1 , V 2 ,...,V N 】 (18)

[0090] where V 1 is the channel information feedback matrix from the terminal to the first cooperative base station, V 2 is the channel information feedback matrix from the terminal to the second cooperative base station, V N is the channel information feedback matrix from the terminal to the Nth coordinated base station. The first feedback matrix of each channel information feedback matrix is ​​used as a reference, and the last N-1 feedback matrices are sequentially fed back in the form of difference. i.e. the first matrix V 1 That is, it is formed by the same quantization method as formula (17), where b is the number of quantization bits of ψ, and b+2 is the number of quantization bits of φ; the feedback value of the second matrix is ​​Φ2-Φ1, ψ2-ψ1, which is The difference value Φ2-Φ1 is fed back with b-2 bits, and ψ2-ψ1 is fed back with b bits. The feedback va...

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Abstract

The invention discloses a channel information feedback method and a system. The channel information feedback method comprises the following steps: a pre-coding matrix required to be fed back can be decomposed into the product of a plurality of Givens rotating matrixes, wherein each rotating matrix is only related to a rotating angle; and the corresponding rotating angle of the rotating matrix after being decomposed is fed back. The method and the system provided by the invention are a channel compression quantized feedback solution based on the Givens transformation, wherein the pre-coding matrix required to be fed back can be transformed into a limited angle value through continuous Givens rotation, and a base station can rebuild a channel matrix by using the fed-back quantitative angles so as to calculate a pre-coding vector, so that the feedback cost can be effectively reduced. Compared with the traditional scalar quantization, the channel information feedback method can effectively reduce the number of the quantitative elements, thereby decreasing the feedback quantity. With respect to the vector quantization, the only requirement is to carry out the operation of decomposition and quantization, so that the system complexity can be effectively lowered under the condition of ensuring the system performance.

Description

technical field [0001] The invention relates to the communication field, in particular to a channel information feedback method and system. Background technique [0002] Coordinated multipoint transmission (CoMP) technology can effectively improve the frequency utilization rate of the system, and can effectively suppress inter-user interference through cooperative processing between cells. However, with the increase of the number of antennas and the cooperation of multiple cells, the user needs to feed back the channel information of the local cell and its cooperative cell at the same time, and the amount of feedback is huge. Therefore, the user quantizes and compresses the estimated channel state information (CSI), and then feeds back the quantized bit information to the base station. The base station reconstructs the channel according to the quantized information obtained by feedback, and designs a precoding matrix. In this way, interference among multiple users can be e...

Claims

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0026H04L1/06H04L1/0029H04B7/0478H04B7/0663H04L2025/03808
Inventor 姜静郁光辉朱常青
Owner ZTE CORP
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