CO-OFDM系统中一种新颖相位噪声抑制算法  

A Novel Phase Noise Suppression Algorithm in CO-OFDM Systems

作　　者：袁建国[1,2] 张芳[1] 邱飘玉 吴英冬 胡潇月 郭乔[1] 

机构地区：[1]重庆邮电大学光电信息感测与传输技术重庆市重点实验室,重庆400065 [2]重庆邮电大学光通信与网络重点实验室,重庆400065

出　　处：《半导体光电》2017年第4期557-561,共5页Semiconductor Optoelectronics

摘　　要：针对相干光正交频分复用(CO-OFDM)系统中相位噪声造成的严重影响,提出了一种采用线性插值和卡尔曼滤波相结合的相位噪声抑制算法。该算法在第一阶中对接收端的时域信号进行线性组合,之后利用线性插值算法对相位噪声进行初步抑制,在第二阶中采用卡尔曼滤波技术来抑制残余的相位噪声。分析和仿真表明:提出的二阶算法能够有效地抑制相位噪声对OFDM符号的影响,在相位噪声线宽较大时明显地降低错误平层,利用所提出的二阶算法可使误码率达到10^(-7)以下,有效地提高了系统的性能。To deal with the severe influence caused by phase noise in the coherent optical orthogonal frequency division multiplexing （CO-OFDM） systems, a novel phase noise suppression algorithm based on the linear-interpolation and the Kalman filtering is proposed. The novel algorithm linearly combines the time domain signal at the receiver, and then preliminarily suppresses the phase noise using the linear interpolation method in the first stage. In the second stage, the residual phase noise is suppressed with the technique of the Kalman filtering. The analysis of the simulation results shows that the proposed two-stage algorithm can effectively suppress the influence of the phase noises on the OFDM symbols and apparently reduce the error floor at the condition of the large phase noise. The BER performance can reach below the level of 10^-7 and the performance of the system can effectively be improved by using the proposed two- stage algorithm.

关 键 词：相干光正交频分复用 相位噪声 卡尔曼滤波 线性插值 

分 类 号：TN929.1[电子电信—通信与信息系统]