Chinese Optics Letters, 2015, 13 (s1): S10601, Published Online: Jan. 27, 2015
Performance analysis of LDPC code based on Watermark scheme in high-speed optical communication system
Abstract
We study the decoding performance of low-density parity-check (LDPC) code based on Watermark scheme under different percentages of water-mark bits over 100 Gb/s differential quadrature phase shift keying (DQPSK) high-speed optical communication system. We also find the optimum percentage of water-mark bits according to the performance comparison. Simulation result shows an improvement of 0.5 dB net code gain by using the optimum Watermark scheme at a post-forward error correction bit error rate (BER) of 10-9, comparing with the traditional log-likelihood ratios belief propagation decoding algorithm. Also, for the same BER, there is a decrease in the number of iterations used in LDPC decoding.
Wenxue He, Wenbo Zhang, Chao Li, Lixia Xi, Xiaoguang Zhang, Yaojun Qiao. Performance analysis of LDPC code based on Watermark scheme in high-speed optical communication system[J]. Chinese Optics Letters, 2015, 13(s1): S10601.