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

Paper Details

Date Published: 14 February 2019
PDF: 4 pages
Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110480X (14 February 2019); doi: 10.1117/12.2519597
Show Author Affiliations
Midou Cui, Beijing Univ. of Posts and Telecommunications (China)
Liqian Wang, Beijing Univ. of Posts and Telecommunications (China)
Dongdong Wang, Beijing Univ. of Posts and Telecommunications (China)
Xue Chen, Beijing Univ. of Posts and Telecommunications (China)
Fu Yang, Beijing Univ. of Posts and Telecommunications (China)


Published in SPIE Proceedings Vol. 11048:
17th International Conference on Optical Communications and Networks (ICOCN2018)
Zhaohui Li, Editor(s)

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