Home > Archive>Volume 11, Issue 6, 2015 >449-452. DOI:10.1007/s11801-015-5182-z
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A new LDPC decoding scheme for PDM-8QAM BICM coherent optical communication system
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1. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China;;2. School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

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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 Infor-

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    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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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]. Optoelectronics Letters,2015,11(6):449-452

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History
  • Received:September 25,2015
  • Revised:October 15,2015
  • Online: January 21,2016
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