Archive > Volume 11 Issue 6 > 2015,11(6):449-452. DOI:10.1007/s11801-015-5182-z CSTR:[cstr] Prev Next
A new LDPC decoding scheme for PDM-8QAM BICM coherent optical communication system
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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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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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