Performance analysis of LDPC code based on Watermark scheme in high-speed optical communication system  

作　　者：何文雪 张文博 李超 席丽霞 张晓光 乔耀军 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China [2]College of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

出　　处：《Chinese Optics Letters》2015年第13期5-8,共4页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （No. 61205065）, the Open Fund of State Key Laboratory of Advanced Optical Communication Systems and Networks （No. 2013GZKF031310）, and the National 863 Program of China （No. 2013AA013401）.

摘　　要：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.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.

关 键 词：LDPC码 数字水印 高速光纤通信系统 性能分析 置信传播译码算法 低密度奇偶校验 高速光通信系统 正交相移键控 

分 类 号：TN911.22[电子电信—通信与信息系统] TP391.41[电子电信—信息与通信工程]