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Method for generating codebooks under relevant channels in wireless communication system

A wireless communication system and channel technology, applied in transmission systems, baseband system components, and error prevention/detection through diversity reception, can solve problems such as no longer optimality, weak channel spatial correlation, etc., to overcome The effect of using restrictions and improving quantization accuracy

Inactive Publication Date: 2010-12-22
BEIHANG UNIV +1
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Problems solved by technology

However, the actual channel, especially the channel in the macro cell scenario of the mobile cellular system, its angle spread varies from low to high, and the channel spatial correlation also changes from strong to weak accordingly.
Traditional codebooks, such as GLP codebooks or DFT codebooks, are difficult to adaptively match different channel correlation conditions, so they are no longer optimal

Method used

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  • Method for generating codebooks under relevant channels in wireless communication system
  • Method for generating codebooks under relevant channels in wireless communication system
  • Method for generating codebooks under relevant channels in wireless communication system

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Embodiment Construction

[0027] The codebook generation method under the relevant channel in the wireless communication system proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0028] (1) In the downlink of the mobile cellular system in the wireless communication system, the base station has S transmitting antennas, each user has a receiving antenna, and the base station and all users use the same initial codebook D 1and D 2 , where the initial codebook D 1 for a S×2 B The matrix, b in the matrix 1 listed as:

[0029] b 1 =1,...,2 B , where B is the number of bits fed back by each user to the base station, 2 B is the initial codebook D 1 The number of columns in (□) T Represents the transpose operation of a vector;

[0030] initial codebook D 2 for 2 B ×2 B A complex Gaussian random matrix, where b 2 column as randomly generated 2 B ×1 vector, the vector elements obey the complex Gaussian distribution with a mean of 0 and ...

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Abstract

The invention relates to a method for generating codebooks under relevant channels in a wireless communication system, and belongs to the technical field of wireless communication. In the method, a base station and users use two same initial codebooks, one initial codebook is composed of conventional DFT code words, and the other initial codebook is composed of random vectors. Each user calculates the relevant matrix rank information of an own channel and feeds the matrix rank information back to the base station; and the base station and the users independently generate new two-stage target codebooks based on weighing DFT code words by the same algorithm by utilizing the initial codebooks according to the rank information. The weighing DFT code word-based codebooks designed by the method have a flexible structure of the two-stage target codebooks, improve the quantified accuracy of the channels, and can be adaptively applied to the relevant condition of different channels; and the existing rank feedback information in the conventional standard is utilized fully without causing the expense of an additional system feedback link, so the weighing DFT code word-based codebooks are compatible with the conventional system, and can be applied to the future wireless communication system conveniently.

Description

technical field [0001] The present invention relates to a method for generating a codebook in a wireless communication system under a relevant channel, in particular to a method for designing a codebook based on a weighted discrete Fourier transform codeword in a wireless communication system based on a limited feedback technology in a relevant channel, which belongs to the wireless communication technology field. Background technique [0002] With the continuous progress of society and the rapid development of wireless communication technology, people's requirements for wireless communication services have expanded from pure voice services to multimedia services including the Internet. Therefore, future mobile communication systems require greater system data rates, Better communication quality, longer range, faster data rate and lower cost, etc. However, under the complex mobile communication environment and limited spectrum resources, traditional methods to improve the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/02H04B1/707
Inventor 袁方韩圣千杨晨阳张煜雷鸣
Owner BEIHANG UNIV
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