LDPC code constructing method based on coding cooperative communication

A technology of LDPC codes and construction methods, which is applied in the field of communication channel coding and decoding, can solve the problems of not considering the formation of short loops, matrix performance impact, etc., and achieve the effects of performance improvement, hardware complexity reduction, and complexity reduction

Inactive Publication Date: 2010-08-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

In this way, there is a major problem. Adding the unit matrix to the sparse area in the lower left corner does not consider the pos...

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  • LDPC code constructing method based on coding cooperative communication
  • LDPC code constructing method based on coding cooperative communication
  • LDPC code constructing method based on coding cooperative communication

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example 1

[0032] The first step is to choose the finite field GF(2 6 ) on the multiplicative inverse basis matrix W (1) ;

[0033] In the second step, since the multiplicative identity element has already appeared in the base matrix, the identity element is placed on the diagonal of the base matrix through the exchange of matrix rows;

[0034] The third step puts the matrix obtained in the second step in GF(2 6 ) field to expand the extended matrix H (1) , H (1) A "diagonal line" will appear in the

[0035] The fourth step takes H (1) The matrix of 1323 × 3024 in the upper left corner, and the sub-matrix above the diagonal is replaced by a zero matrix, that is, the QC-LDPC code of (3024, 1323) with a nested structure in the lower triangle is obtained, such as image 3 shown.

[0036] Apply the LDPC codeword constructed by the above steps to the CC scheme. In the first time slot, the source node converts part of the matrix The corresponding bits are broadcast to the relay node a...

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Abstract

The invention discloses an LDPC code constructing method based on coding cooperative communication; the method comprises the following steps: 1. choose a basis matrix W (1) based on finite field multiplicative inverse; the multiplicative inverse of a certain element in the basis matrix is multiplied with each row of the basis matrix, so as to generate a multiplicative identity in the basis matrix; 3.the basis matrix is expanded, so as to obtain an expansion matrix containing diagonal line; 4. the submatrix above the diagonal line is substituted by zero matrix, so as to obtain a quasi-cyclic matrix which is provided with a lower triangular type and has a nested structure; the invention can flexibly construct the quasi-cyclic matrix with the nested structure, which is suitable for CC proposal, while reducing the code construction complexity, the complexity of a coder of a trunk node and a destination node is reduced; in addition, the code in the invention does not have short link characteristic, and the performance of the code is promoted obviously compared with the traditional decode and forward, DF proposal.

Description

technical field [0001] A method for constructing an LDPC code based on coding cooperation belongs to the field of communication channel coding and decoding, and in particular relates to a method for constructing a parity check matrix of an LDPC code in coded cooperative communication. technical background [0002] In order to meet the requirements of multi-rate multimedia communication, the next-generation wireless system should not only increase the data rate, but also enable the system to ensure the quality of service required by different media. However, multipath fading in wireless communication is an important factor affecting communication transmission rate and reliability. How to solve the impact of multipath effect is the key to improving communication quality. The multiple-input multiple-output (MIMO) technology can use the spatial multiplexing gain to increase the channel capacity, and at the same time, the spatial diversity gain can be used to effectively eliminat...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04L1/18H03M13/11
Inventor 费泽松罗晨刘珂珂匡镜明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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