Open AccessA Novel Construction Approach of Irregular LDPC Codes Based on QC Structure and Zigzag Pattern
Author(s) -
Lei Jing,
Yao Chunguang,
Chen Bin,
Wen Lei,
Liu Wei
Publication year - 2015
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2015.10.020
Subject(s) - zigzag , low density parity check code , computer science , algorithm , mathematics , geometry , decoding methods
This paper presents a novel construction method of irregular Low‐density parity‐check (LDPC) codes based on Quasi‐cyclic (QC) structure and zigzag pattern. By using the proposed method, a class of irregular and highly structured LDPC codes can be designed with the advantages of low storage requirement and linear time encoding complexity. The constructed codes are called Irregular repeat‐accumulate like (IRA‐like) codes since their parity‐check matrices are similar with those of IRA codes, which all contain a sparse zigzag pattern submatrix. The left part of the parity‐check matrix of IRA‐like codes is a kind of circulant permutation matrix. A best‐eort analyzing method for optimizing the cycle structure of IRAlike codes is presented. We further details the proper constraints for avoiding short cycles and low‐weight codewords. Simulation results show that the proposed IRA‐like codes have low encoding complexity, good iterative decoding performance and exible choice of code parameters.