QPSK直接检测光通信系统中水印位辅助的LDPC方案
Watermark bits auxiliary LDPC scheme in DQPSK direct detection optical communication system
本文研究了在100Gb/s高速光通信系统中，使用DQPSK调制格式时，水印位辅助的低密度奇偶校验码（LDPC）纠错编码方案中水印位比例对水印方案性能的影响。通过对译码性能的对比，给出了该水印方案中水印位数量的最佳比例关系。仿真结果表明，在BER=1e-9时，与传统的对数似然比置信度传播（LLR-BP）译码算法相比较，水印位辅助的LDPC方案的最佳净编码增益（NCG）提高了0.5dB，同时，在获得相同的误码率时，译码过程所用到的平均迭代次数也得到了很大程度的降低。
In this paper, we study the influence of decoding performance of watermark bits auxiliary LDPC scheme under different percentages of watermark bits over 100Gb/s DQPSK high-speed direct detection optical communication system. We also find the optimum percentage of water-mark bits according to the performance comparison. Simulation result shows that an improvement of 0.5dB net code gain (NCG) has been gained by using the optimum Watermark scheme at a post-FEC BER of 1e-9, comparing with the traditional Log-likelihood Ratios Belief Propagation (LLR-BP) decoding algorithm. Also, for the same bit error rate (BER), the number of iterations used in LDPC decoding decreases.
张文博、何文雪、张晓光、席丽霞
通信光电子技术
光通信低密度奇偶校验码水印方案译码性能
optical communicationslow-density parity-check codeWatermark schemedecoding performance
张文博,何文雪,张晓光,席丽霞.QPSK直接检测光通信系统中水印位辅助的LDPC方案[EB/OL].(2015-01-04)[2025-08-12].http://www.paper.edu.cn/releasepaper/content/201501-5.点此复制
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