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Proceedings Paper

Low complexity multi-level NB-QC-LDPC coded modulation scheme for optical communication systems
Author(s): Dongdong Wang; Chenhua Sun; Liqian Wang; Xue Chen; Yantao Guo; Guannan Jia; Yong Li; Yang Wang
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Paper Abstract

In this paper, we propose a multi-level non-binary quasi-cyclic low density parity check (NB-QC-LDPC) coded modulation (CM) scheme to reduce the decoding complexity while maintaining and/or exceeding the super BER performance of the traditional NB-QC-LDPC CM scheme. Firstly, local optimal searching combined with the classical superposition construction is proposed to construct the required NB-QC-LDPC codes with possibly enlarged girth and less number of the shortest cycles. Secondly, by analyzing the changing trend of the BER performance and decoding complexity of the NB-QC-LDPC code defined over 𝐺𝐹(𝑄) incident to 𝑄. We find that the decoding complexity increases proportionally with the increase of 𝑄, but the best BER performance usually corresponds to a smaller 𝑄. Finally, by replacing the high-order NB-QC-LDPC code based CM scheme to the multi-level low-order NB-QC-LDPC code based CM scheme, the decoding complexity can be effectively reduced. Simulation results show that the designed two-level 𝐺𝐹(4)/𝐺𝐹(8) QC-LDPC code based 16QAM/64QAM CM system can perform almost the same or even better BER performance with/than the corresponding traditional 𝐺𝐹(16) / 𝐺𝐹(64) QC-LDPC code based 16QAM/64QAM CM system.

Paper Details

Date Published: 14 February 2019
PDF: 5 pages
Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110481O (14 February 2019); doi: 10.1117/12.2522090
Show Author Affiliations
Dongdong Wang, The 54th Research Institute of China Electronics Technology Group Corp. (China)
Beijing Univ. of Posts and Telecommunications (China)
Chenhua Sun, The 54th Research Institute of China Electronics Technology Group Corp. (China)
Liqian Wang, Beijing Univ. of Posts and Telecommunications (China)
Xue Chen, Beijing Univ. of Posts and Telecommunications (China)
Yantao Guo, The 54th Research Institute of China Electronics Technology Group Corp. (China)
Guannan Jia, The 54th Research Institute of China Electronics Technology Group Corp. (China)
Yong Li, The 54th Research Institute of China Electronics Technology Group Corp. (China)
Yang Wang, The 54th Research Institute of China Electronics Technology Group Corp. (China)


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

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