SLM结合限幅算法提高CO-OFDM系统性能的研究  

Study on CO-OFDM system performance improvement by SLM-Clipping

作　　者：张斯尧[1] 闫连山[1] 叶佳[1] 易安林[1] 

机构地区：[1]西南交通大学信息科学与技术学院信息光子与通信研究中心,四川成都610031

出　　处：《光通信研究》2013年第5期19-20,33,共3页Study on Optical Communications

摘　　要：分析了CO-OFDM(相干光正交频分复用)系统中各个子载波之间的序列相关性对系统性能的影响,并提出了使用SLM(选择映射)法结合限幅算法来降低CO-OFDM各个子载波之间的序列相关性,抑制系统中FWM(四波混频)效应导致的损伤,以提高CO-OFDM系统性能。理论分析和仿真结果表明,该方法在误码率为10-3的情况下,与SLM法和限幅算法相比,灵敏度分别提高约1.8和3.4dB。On the basis of analyzing the effects of the serial correlation among the subcarriers of the CO-OFDM system on its performances,this paper proposes a new approach,in which the SeLected Mapping （SLM）method and the clipping method are combined.This approach optimizes the subcarrier serial correlation and mitigates the Four-Wave Mixing （FWM）effects that are mainly dependent on the former,thus improving the system performance.Theoretical analysis and MATLAB simulation results show that compared with SLM and clipping methods,this approach improves the sensitivity by about 1 .8 and 3.4 dB respectively at the BER of × 10-3 .

关 键 词：相干光正交频分复用 序列相关性 四波混频 选择映射法 限幅法 

分 类 号：TN915.9[电子电信—通信与信息系统]