Wang Wei, Xu Bo. A complexity reduction method for decoding algorithm for LDPC codes in fiber-optic communications[J]. 2009,(1):21-23. DOI: 10.13756/j.gtxyj.2009.01.014.
Quasi-Cyclic Low-Density Parity-Check(QC-LDPC) code can bring about higher coding gain for fiber-optic communication systems
but the computation of Log-Likelihood Ratio(LLR) in the decoding process is very complicated.To reduce the complexity of the decoder hardware design
this paper introduces a simplified LLR algorithm in fiber channels.The simulation results show that this algorithm is subject to a decoding performance loss of only 0.05 dB compared with the original one.