基于二维投影直方图导频辅助的相干光正交频分复用系统公共相位误差噪声补偿算法  

Common Phase Error Compensation in Coherent Optical OFDM System with Two-Dimensional Projection Histogram-Based and Pilot-Aided Method

作　　者：杨国伟[1] 叶玮胜 毕美华[1,2] 滕旭阳 曾然[1] 胡淼[1] Yang Guowei;Ye Weisheng;Bi Meihua;Teng Xuyang;Zeng Ran;Hu Miao(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou,Zhejiang 310018,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光学学报》2019年第11期59-68,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61501157,61571291,61705055,11574068);浙江省自然科学基金(LY17F050012);浙江省自然科学基金青年科学基金(LQ19F020009)

摘　　要：提出一种用于相干光正交频分复用系统的公共相位噪声补偿算法。该算法采用二维投影直方图的公共相位噪声盲估计方法,并充分结合了基于导频的相位噪声估计方法,实现了对公共相位噪声的有效补偿。利用少量的梳状导频对频域符号的公共相位噪声进行初始估计和补偿;再将初始补偿后的频域符号的星座图映射到二维数字图像,利用二维投影直方图进行更精细的公共相位噪声补偿。为了验证算法性能,搭建了基于MATLAB和OptiSystem的20 Gbit/s仿真系统,并在标准单模光纤中传输50 km。结果表明,该算法能有效解决投影直方图盲估计算法以π/2为周期的偏差问题,而且仅需少量的导频就能实现比传统导频辅助算法更高的误码性能。In this paper, we propose a novel algorithm for compensating the common phase noise in coherent optical orthogonal frequency division multiplexing system. The proposed algorithm adopts the common phase noise blind estimation method which is based on the two-dimensional projection histogram,and a pilot-aided phase noise estimation method is combined, thereby realizing the effect compensation for the common phase noise. First, the common phase noise of frequency domain symbols caused by few comb-type pilots can be estimated initially and compensated. Second, by using the two-dimensional projection histogram, the constellation of received signals can be mapped in two-dimensional digital images, and the fine compensation for the common phase noise can be achieved. To verify the performance of our scheme, we build a 20 Gbit/s simulation system based on the commercial OptiSystem and MATLAB over 50 km standard single mode fiber transmission. The corresponding results show that, the proposed algorithm can solve the problem that the bias with period of π/2 exists in the projection histogram blind estimation algorithm. Compared to the traditional pilot-aided scheme, our scheme uses only fewer numbers of pilots and achieves better bit error ratio performance.

关 键 词：光通信 相干光 正交频分复用 公共相位噪声 投影直方图 导频 

分 类 号：TN929.18[电子电信—通信与信息系统]