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

作者：Lei Jing^*; Yao Chunguang; Chen Bin; Wen Lei; Liu Wei

来源：Chinese Journal of Electronics, 2015, 24(4): 783-789.

DOI：10.1049/cje.2015.10.020

• LDPC codes
• QC structure
• Zigzag pattern
• IRA-like codes

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 code-words. Simulation results show that the proposed IRA-like codes have low encoding complexity, good iterative decoding performance and flexible choice of code parameters. Key words LDPC codes, QC structure, Zigzag

• 出版日期2015-10
• 单位中国人民解放军国防科学技术大学