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A design method of an original mode diagram LDPC code

An LDPC code and design method technology, applied in the field of channel coding, can solve the problems of inability to construct an H matrix to resist burst, low decoding success probability, etc., and achieve improved decoding success rate, excellent anti-burst error performance, and high performance. boosted effect

Inactive Publication Date: 2018-12-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Moreover, the actual burst error is usually generated when the AWGN channel is superimposed with burst noise. Therefore, when the code length of the LDPC code is not long enough, it is impossible to construct a sparse enough H matrix to resist the burst. After the code word passes through the burst error channel, Very low probability of successful decoding

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  • A design method of an original mode diagram LDPC code
  • A design method of an original mode diagram LDPC code
  • A design method of an original mode diagram LDPC code

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Embodiment Construction

[0032] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0033] The code rate of the protograph LDPC does not uniquely determine the number of check nodes and variable nodes, if the number of check nodes and variable nodes is n c and nv,n p is the number of variable nodes being punctured, then the code rate of the original model graph LDPC code is R=(n v -n c ) / (n v -n p ).

[0034] The embodiment takes the base matrix of the AR4JA series as an example, and applies the PEG( PPEG) algorithm and the PEG (IPPEG) algorithm of the improved protograph LDPC code are simulated to verify the effectiveness of the method of the present invention. The basic matrix and the original model diagram of the code rate R={1 / 2,2 / 3,3 / 4} are as follows image 3 As shown, the code lengths are N={300,500,700}, the channel erasure probability p={0.05,0.1,0.2}, and the performance of the original ...

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Abstract

The invention belongs to the technical field of channel coding, in particular to a design method of an original mode diagram LDPC code. The scheme of the invention utilizes the advantages of flexibleconstruction and convenient analysis of the original module LDPC code, optimizes the PEG algorithm of the original module LDPC code, and constructs a more sparse LDPC code. By adding the constraint conditions of PEG algorithm in removing duplicate edges, that is, adding the constraint to increase the average minimum distance of non-zero elements in the selection of inspection nodes, the burst resistance of PEG algorithm is achieved. The method not only inherits the advantage of traditional PEG algorithm without four rings, but also ensures that the ring length is as large as possible. Throughsuch a design method, the performance of LDPC codes under medium and short codes is improved, and the purpose of anti-burst can be achieved. Finally, in the burst deletion channel, the method of adding interleaving is used to further improve the decoding success rate.

Description

technical field [0001] The invention belongs to the technical field of channel coding, and in particular relates to a design method of a protograph LDPC code. Background technique [0002] The LDPC (Low Density Parity Check) code proposed by Gallgaer in 1963 is a good code that can approach the Shannon limit. Now it has attracted more and more attention from researchers, so it can be applied to various communication standards, including satellite digital TV transmission. Standard, deep space communication and data channel under 5G standard eMBB. LDPC codes can usually be constructed in a random way or in a structured way. The randomization construction method is flexible and changeable, but the complexity is very high. The implementation complexity of the structured construction method is relatively low, and it is relatively simple, but because it uses some algebraic methods, it is not flexible enough for us to construct any code rate. [0003] Based on the above two cons...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/1148
Inventor 李艳霞史治平邓莉唐锐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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