Bit-mapping-based irregular QC-LDPC coded BICM scheme for optical communication systems

Midou Cui; Liqian Wang; Dongdong Wang; Xue Chen; Fu Yang

doi:10.1117/12.2519597

14 February 2019 Bit-mapping-based irregular QC-LDPC coded BICM scheme for optical communication systems

Midou Cui, Liqian Wang, Dongdong Wang, Xue Chen, Fu Yang

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 110480X (2019) https://doi.org/10.1117/12.2519597
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

In this paper, we propose a two-stage bit mapping based irregular QC-LDPC coded BICM scheme to further improve the BER performance of BICM system. Firstly, with the aid of EXIT chart, the irregular code ensemble with optimal convergence threshold can be found, then PEG algorithm is used to construct the required irregular QC-LDPC code with possibly enlarged girth from the ensemble. Secondly, a two-stage bit mapping design method is introduced to find the optimal bit mapping distribution and the near optimal bit mapping table, which can further improve the convergence threshold of the BICM system. Simulation results show that, when applying the proposed scheme to BTB coherent optical PM-64QAM system, additional 0.13dB net coding gain can be achieved compared with the traditional BICM scheme at the BER of 10^-5.

Citation Download Citation

Midou Cui, Liqian Wang, Dongdong Wang, Xue Chen, and Fu Yang "Bit-mapping-based irregular QC-LDPC coded BICM scheme for optical communication systems", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110480X (14 February 2019); https://doi.org/10.1117/12.2519597

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