LEI Jing, YAO Chunguang, CHEN Bin, WEN Lei, LIU Wei. A Novel Construction Approach of Irregular LDPC Codes Based on QC Structure and Zigzag Pattern[J]. Chinese Journal of Electronics, 2015, 24(4): 783-789. doi: 10.1049/cje.2015.10.020
Citation: LEI Jing, YAO Chunguang, CHEN Bin, WEN Lei, LIU Wei. A Novel Construction Approach of Irregular LDPC Codes Based on QC Structure and Zigzag Pattern[J]. Chinese Journal of Electronics, 2015, 24(4): 783-789. doi: 10.1049/cje.2015.10.020

A Novel Construction Approach of Irregular LDPC Codes Based on QC Structure and Zigzag Pattern

doi: 10.1049/cje.2015.10.020
Funds:  This work is supported by the National Natural Science Foundation of China (No.61372098).
  • Received Date: 2012-01-11
  • Rev Recd Date: 2015-01-22
  • Publish Date: 2015-10-10
  • 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-effort analyzing method for optimizing the cycle structure of IRA-like 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 flexible choice of code parameters.
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