基于级联ISFA信道估计的光OFDM系统研究  

Investigation of optical OFDM systems based on cascade ISFA channel estimation

作　　者：成运[1] 陈明[2] 陈林[2] 肖敏雷[1] 

机构地区：[1]湖南人文科技学院信息科学与工程系,湖南娄底417000 [2]湖南大学信息科学与工程学院,长沙410082

出　　处：《光通信技术》2014年第11期27-30,共4页Optical Communication Technology

基　　金：国家自然科学基金(61377079)资助;湖南省自然科学基金项目(12JJ2040)资助;湖南省重点学科建设项目资助;湖南省高校科技创新团队支持计划项目资助

摘　　要：采用训练序列与级联符号内频域平均(intra-symbol frequency-domain averaging,ISFA)的信道估计方法提高了直接检测光正交频分复用(OFDM)接收机中信道估计的准确性。通过Matlab编程建立了强度调制直接检测系统仿真平台,对不同调制格式的OFDM信号进行了数值仿真分析。结果表明,级联ISFA方法可以提供更为准确的信道估计,有效改善高阶QAM调制的OFDM信号误码性能,提高接收机的灵敏度。A training sequence（TS） and cascade intra-symbol frequency-domain averaging （ISFA） method is proposed to improve the accuracy of channel estimation in intensity modulated and directly-detection optical orthogonal frequency-division multiplexing （IMDD-OOFDM） systems. The simulation platform of IMDD is established by employing mathworks Matlab software, and then the numerical simulation analysis of the sys- tem with different modulation formats and cascaded ISFA is also performed. The results show that the cascad- ed ISFA method can provide more accurate channel estimation, and effectively improve the bit error ratio per- formance of high-order QAM modulated OFDM signal and receiver sensitivity.

关 键 词：符号内频域平均 信道估计 直接检测 正交频分复用 

分 类 号：TN929.11[电子电信—通信与信息系统]