副载波调制无线光通信分集接收技术研究  

Research on diversity receive technology on wireless optical communication using subcarrier modulation

作　　者：陈丹[1] 柯熙政[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《通信学报》2012年第8期128-133,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(60977054);陕西省自然科学基金资助项目(2012JQ8004);陕西省教育厅科技专项基金资助项目(11JK1010);西安市科技计划基金资助项目(CXY1120);西安理工大学科技创新研究计划基金资助项目(105-211014;105-211202)~~

摘　　要：基于湍流信道条件下光强闪烁的对数正态分布模型,建立了副载波BPSK调制的无线光通信空间接收分集系统。在不同光强闪烁效应和接收天线数下,分别对比分析了3种线性合并技术的差错性能及分集增益。仿真结果表明,分集技术可以有效地改善无线光通信系统性能,具有较强的抗大气信道衰落能力。3种合并技术中,系统误码率性能改善最优的是MRC,其次是EGC,而SelC较差,对短距离且弱光强闪烁下的FSO系统,不建议空间分集采用选择合并方式。Based on the log-normal model under the turbulence channel, the BPSK subcarrier modulated FSO system with spatial diversity was established. Under different scintillation distribution and different detectors, the error performance and diversity gain among three linear combining technologies were compared. The simulation results show that the performance improved of system by MRC is the best, followed by EGC, and SelC is poor. Spatial diversity is efficient to improve the performance and have strong ability on resistance to atmospheric channel decline. But on short link FSO system experiencing weak irradiance fluctuation, SelC spatial diversity would not be recommended

关 键 词：无线光通信 副载波调制 分集接收 差错性能 

分 类 号：TN929.1[电子电信—通信与信息系统]