M湍流信道下副载波BPSK调制系统的误码率分析  

Analysis of BER Performance of Subcarrier Modulated BPSK System over M-distributed Atmospheric Turbulence Channel

作　　者：方宗奎[1] 

机构地区：[1]中国人民解放军91245部队,葫芦岛125000

出　　处：《遥测遥控》2017年第2期43-48,共6页Journal of Telemetry,Tracking and Command

摘　　要：将FSO激光通信应用于遥测系统已成为技术发展趋势。讨论FSO激光通信中BPSK调制的误码率问题,提出一个复合信道模型。该模型考虑了大气衰减、M大气湍流模型和非零瞄准指向误差的共同影响,并利用Weibull分布拟合得到一个近似模型。基于这个近似信道模型,利用广义Gauss-Lagueree展开式,推导出误码率闭合表达式,并分析FSO激光通信副载波BPSK调制系统的误码率性能。数值仿真结果表明,推导的误码率理论值与仿真值十分接近。该研究有助于未来将激光通信应用于遥测系统的设计。Adopting FSO laser communication system in telemetry system is a trend of technology development. A composite channel model for BER performance research of subcarrier modulated BPSK system in FSO laser communication is considered so as to accurately describe the atmospheric channel, which includes the effects of atmospheric attenuation, M-distributed atmospheric turbulence and nonzero-boresight pointing error, and an approximate model is achieved by fitting the Weibull distribution. Based on this approximate channel model, a closed-form expression of BER is derived by using the generalized Gauss-Lagueree quadrature rule. The BER performance of FSO laser communication system utilizing subcarrier modulated BPSK technology is analyzed. Numerical results show that the derived theoretical result of the BER is accurate enough, which is helpful for the design of future telemetry system using FSO laser communication.

关 键 词：FSO M湍流 指向误差 误码率 副载波BPSK 

分 类 号：TN96[电子电信—信号与信息处理]