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.
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This work has been supported by the National Natural Science Foundation of China (No.61205065), the Fund of State Key Laboratory of Information Photonics and Optical Communications and the Fundamental Research Funds for the Central Universities in China (No.2014RC1201).
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Liu, Y., Zhang, Wb., Xi, Lx. et al. A new LDPC decoding scheme for PDM-8QAM BICM coherent optical communication system. Optoelectron. Lett. 11, 449–452 (2015). https://doi.org/10.1007/s11801-015-5182-z
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DOI: https://doi.org/10.1007/s11801-015-5182-z