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Decoding of quasi-cyclic LDPC codes with section-wise cyclic structure

Juane Li, Keke Liu, Shu Lin, Khaled Abdel-Ghaffar
2014 2014 Information Theory and Applications Workshop (ITA)  
Presented in this paper is a reduced-complexity iterative decoding scheme for quasi-cyclic (QC) LDPC codes. This decoding scheme is devised based on the section-wise cyclic structure of the parity-check matrix of a QC-LDPC code. Using this decoding scheme, the hardware implementation complexity of a QC-LDPC decoder can be significantly reduced without performance degradation. A high-rate QC-LDPC code that can achieve a very low error-rate without a visible error-floor is used to demonstrate the
more » ... to demonstrate the effectiveness of the proposed decoding scheme. Also presented in this paper are two other high-rate QC-LDPC codes and a method for constructing rate-1 2 QC-LDPC codes whose Tanner graphs have girth 8. All the codes constructed perform well with low error-floor using the proposed decoding scheme.
doi:10.1109/ita.2014.6804221 dblp:conf/ita/LiLLA14 fatcat:pgydhtdiyja7jiymxw7weoligy