光电子快报(英文版), 2015, 11 (6): 449, Published Online: Oct. 12, 2017
A new LDPC decoding scheme for PDM-8QAM BICM coherent optical communication system
Abstract
A new log-likelihood ratio (LLR) message estimation method is proposed for polarization-division multiplexing eight quadrature amplitude modulation (PDM-8QAM) bit-interleaved coded modulation (BICM) optical communication system. The formulation of the posterior probability is theoretically analyzed, and the way to reduce the pre-decoding bit error rate (BER) of the low density parity check (LDPC) decoder for PDM-8QAM constellations is presented. Simulation results show that it outperforms the traditional scheme, i.e., the new post-decoding BER is decreased down to 50% of that of the traditional post-decoding algorithm.
LIU Yi, ZHANG Wen-bo, XI Li-xia, TANG Xian-feng, ZHANG Xiao-guang. A new LDPC decoding scheme for PDM-8QAM BICM coherent optical communication system[J]. 光电子快报(英文版), 2015, 11(6): 449.