Method for constructing multi-code protograph QC-LDPC code by utilizing large development series

A technology of large derivative sequence and proto-mode map, applied in the field of channel coding in channel processing, can solve the problems of waste of resources and increased cost, and achieve the effect of low decoding threshold

Inactive Publication Date: 2017-11-17
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, while its performance is improved, the coding complexity is also increased, which leads to increased cost and waste of resources in practical applications.

Method used

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  • Method for constructing multi-code protograph QC-LDPC code by utilizing large development series
  • Method for constructing multi-code protograph QC-LDPC code by utilizing large development series
  • Method for constructing multi-code protograph QC-LDPC code by utilizing large development series

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Embodiment Construction

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] 1. Combine with attached figure 1 , 2 Explain, determine the code rate R to construct the code pattern, so as to determine the base matrix B of the original model pro the number of rows n row and number of columns n column , the number of rows designed in this paper is fixed at n row =4, so the formula (1) can be easily deduced from the code rate formula:

[0022] R=(n column -4) / n column =1-4 / n column (1)

[0023] That is, the flexible choice of code rate can be changed by changing n column to fulfill. In order to more clearly highlight the correspondence between the code rate and the number of columns, Table 1 gives the correspondence between them, as follows:

[0024] Table 1 Code rates under different column numbers

[0025]

[0026] Construct a 4×n column The matrix A. The matrix A obtained according to the mat...

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Abstract

The invention relates to a novel method for constructing a multi-code protograph QC-LDPC code by utilizing a large development series to extend a protograph basis matrix. The protograph basis matrix of the method can be obtained through a computer search algorithm; and different code rates can be obtained by adjusting the column number of the protograph basis matrix flexibly. The girth of a check matrix constructed by the method is at least 6; and coding can be realized only by needing a simple shift register. The simulation result shows that, when the bit error rate is 10 to the power of 6, the code gains of the constructed P-DY-QC-LDPC (4000, 2000) code with the code rate of 0.5 and the constructed P-DY-QC-LDPC (4000, 3000) code with the code rate of 0.75 are improved and increased to a certain degree when being respectively compared with other types of codes with the same code rate and approximate code length. Therefore, the method can meet the requirements of a communication system for high coding gain, code rate flexible selectivity and low coding and decoding complexity.

Description

technical field [0001] The invention belongs to the field of channel coding in channel processing, and relates to a method for constructing multi-code-rate protograph QC-LDPC codes by using Dayan sequence. Background technique [0002] In recent years, the superiority of LDPC codes has attracted the attention of researchers at home and abroad, and has become an indispensable part of modern communication systems. It is used to detect and correct information transmission errors caused by channel effects such as noise, attenuation and interference. However, while its performance is improved, the coding complexity is also increased, which leads to increased cost and waste of resources in practical applications. In order to solve this problem, scholars at home and abroad have proposed quasi-cyclic low-density parity-check (quasi-cyclic low-density parity-check, QC-LDPC) codes, whose parity check matrix has quasi-cyclic characteristics, so it is widely used in practical communicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/1162
Inventor 袁建国郑德猛曾晶孙乐乐刘力塽蹇红王晓蓉
Owner CHONGQING UNIV OF POSTS & TELECOMM
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