Novel iteration-free blind phase noise estimation for coherent optical OFDM  

作　　者：任宏亮 蔡嘉兴 卢瑾 温浩 薛林林 覃亚丽 郭淑琴 周守利 胡卫生 

机构地区：[1]College of Information Engineering, Zhejiang University of Technology [2]State Key Laboratories of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University

出　　处：《Chinese Optics Letters》2014年第12期19-23,共5页中国光学快报（英文版）

基　　金：supported in part by the China Postdoctoral Science Foundation(No.2013M540361);the National Natural Science Foundation of China(Nos.60907032 and 61275124);the Natural Science Foundation of Zhejiang Province(No.LY13F010011);the Zhejiang Youth Science Fund(No.LQ13F050005)

摘　　要：We propose a novel iteration-free blind phase noise estimation scheme for coherent optical orthogonal frequency division multiplexing （CO-OFDM） systems. In the new algorithm, the cost function is selected as the similar expression with real and imaginary parts as that in the modified constant modulus algorithm, and the new cost function is derived under some assumptions, where it is infinitely approximated by the sine and cosine functions. By means of the analytical formula of the cost function, the initial coarse common phase error can be obtained with only some samples, where the algorithm avoids computational complexity of conventional blind phase noise compensation scheme. In CO-OFDM systems with high-order modulation format （32 quadrature amplitude modulation） and narrow linewidth lasers, it is proved by the simulation results that the nhase noise can be effectively compensated with the proposed blind estimation method.We propose a novel iteration-free blind phase noise estimation scheme for coherent optical orthogonal frequency division multiplexing （CO-OFDM） systems. In the new algorithm, the cost function is selected as the similar expression with real and imaginary parts as that in the modified constant modulus algorithm, and the new cost function is derived under some assumptions, where it is infinitely approximated by the sine and cosine functions. By means of the analytical formula of the cost function, the initial coarse common phase error can be obtained with only some samples, where the algorithm avoids computational complexity of conventional blind phase noise compensation scheme. In CO-OFDM systems with high-order modulation format （32 quadrature amplitude modulation） and narrow linewidth lasers, it is proved by the simulation results that the nhase noise can be effectively compensated with the proposed blind estimation method.

关 键 词：Amplitude modulation Computational complexity Cosine transforms Cost functions COSTS Error compensation Frequency division multiplexing Frequency estimation Iterative methods Modulation Optical fiber communication Orthogonal frequency division multiplexing Quadrature amplitude modulation 

分 类 号：TN929.1[电子电信—通信与信息系统]