A cyclic‐shift based method for counting cycles of quasi‐cyclic LDPC codes
Hengzhou Xu,
Xiao‐Dong Zhang,
Huaan Li
et al.
Abstract:M. Fossorier proposed how to determine the necessary and sufficient conditions for the existence of cycles in the Tanner graph of quasi‐cyclic LDPC (QC‐LDPC) codes, which has been widely investigated in the study of LDPC codes. This paper presents some new necessary and sufficient conditions for the existence of cycles with arbitrary lengths and proposes a simple and novel method for counting cycles of QC‐LDPC codes based on the improved conditions. Numerical results show that, compared with the existing metho… Show more
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