Performance of CO-OFDM system with RS-Turbo concatenated code  

作　　者：童峥嵘 胡桂彬 曹晔 张卫华 

机构地区：[1]Key Laboratory of Film Electronics and Communication Devices and Key Laboratory of Intelligent Computing and Novel Software Technology, Tianjin University of Technology

出　　处：《Optoelectronics Letters》2015年第6期457-460,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61107052);Tianjin Natural Science Foundation of China(No.11JCYBJC0010);Tianjin Youth Foundation of China(No.13JCQNJC01800)

摘　　要：In this paper,the RS-Turbo concatenated code is applied to coherent optical orthogonal frequency division multiplexing(CO-OFDM) system.RS(186,166,8) and Turbo code with code rate of 1/2 are employed for RS-Turbo concatenated code.Two decoding algorithms,which are Max-Log-MAP algorithm and Log-MAP algorithm,are adopted for Turbo decoding,and the iteration Berlekamp-Massey(BM) algorithm is adopted for RS decoding.The simulation results show that the bit error rate(BER) performance of CO-OFDM system with RS-Turbo concatenated code is significantly improved at high optical signal to noise ratio(OSNR),and the iteration number is reduced compared with that of the Turbo coded system.Furthermore,when the Max-Log-MAP algorithm is adopted for Turbo decoding,the transmission distance of CO-OFDM system with RS-Turbo concatenated code can reach about 400 km without error,while that of the Turbo coded system can only reach about 240 km when BER is lower than 10^(-4) order of magnitude.

关 键 词：OFDM系统 RS解码 MAX-LOG-MAP算法 性能 TURBO码 正交频分复用 解码算法 光信噪比 

分 类 号：TN929.1[电子电信—通信与信息系统]