高速相干光通信系统中水印辅助的低密度奇偶校验方案  

Watermark auxiliary LDPC scheme in high-speed coherent optical communication system

作　　者：何文雪[1] 张文博[2] 李超[1] 席丽霞[1] 张晓光[1] 乔耀军[1] 

机构地区：[1]北京邮电大学信息光子学与光通信国家重点实验室,北京100876 [2]北京邮电大学理学院,北京100876

出　　处：《光电子．激光》2015年第6期1100-1105,共6页Journal of Optoelectronics·Laser

摘　　要：为了研究水印辅助的低密度奇偶校验(LDPC)方案在高速相干接收光通信系统中的译码性能,提出了一种适用于相干光通信系统的水印符号辅助的LDPC前向纠错方案,与传统LDPC相比,可以大大提高相干接收机的抗噪声能力。在100Gbit/s 16进制正交幅度高制(16QAM)相干接收光通信系统上的仿真实验结果表明,在误码率(BER)为10-9时,所提出的前向纠错方案与传统LDPC相比较,信噪比(SNR)增益提高了0.45dB;同时,在相同BER下,水印符号辅助的LDPC方案的译码迭代次数有很明显的降低。In order to research the decoding performance of watermark auxiliary low density parity check scheme in high-speed coherent optical communication system, this paper presents a forward error correc tion scheme of watermark symbols auxiliary low density parity check code used in the coherent communication system. Compared with the traditional low density parity check code, the new scheme can greatly improve the noise immunity of coherent receiver. After running on the 100 Gbit/s 16QAM coherent optical simulation system,the results show that an improvement of 0. 45 dB signal noise ratio （SNR） gain has been realized by the proposed forward error correction scheme compared with traditional low density parity check code,at post-forward error correction bit error rate （BER） of 10^-9. Also, to obtain the same BER,the number of iterations used in watermark system auxiliary LDPC decoding decreases.

关 键 词：光通信 低密度奇偶校验码(LDPC) 水印辅助方案 译码性能 

分 类 号：TN929.11[电子电信—通信与信息系统]