三点协作架构下混合RF/FSO航空通信系统性能分析  

Analysis of Hybrid RF/FSO AirborneCommunication System Performance Under Three-Node Cooperative Architecture

作　　者：刘文亚 王翔[1] 赵尚弘[1] 牟迪 Wenya Liu;Xiang Wang;Shanghong Zhao;Di Mu(Information and Navigation College,Air Force Engineering University,Xi'an,Shanxi 710077,China)

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《激光与光电子学进展》2020年第21期121-128,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(91638101)。

摘　　要：研究一种基于选择合并分集的三点协作架构下的混合射频/自由空间光(RF/FSO)航空通信系统链路性能。在该架构下,FSO链路服从平均孔径效应下的Exponentiated Weibull大气湍流分布模型,RF链路采用Nakagami-m衰落信道模型,推导了系统端到端性能指标的闭合表达式,通过仿真分析湍流强度、调制方式及分集通信方案对系统中断概率(OP)、平均误码率(BER)的影响。仿真结果表明:相比单FSO链路通信,混合RF/FSO航空通信具有更好的BER及OP性能;低阶M-PSK调制能有效改善大气湍流对混合RF/FSO航空通信系统的影响;在信噪比高时,合并分集的通信方案对系统误码性能的改善要优于低阶调制。Link performance of a hybrid radio frequency/free-space optical(RF/FSO)airborne communication system using the three-node cooperative architecture based on selection combination diversity is analyzed in this study.Using this architecture,FSO and RF links are simulated using the Exponentiated Weibull atmospheric turbulence distribution model under the mean aperture effect and Nakagami-m fading channel model,respectively.Closed form expressions for end-to-end performance indicators of this hybrid system are derived.The effects of turbulence intensities,modulation modes,and diversity communication schemes on the outrage probability(OP)and average bit error rate(BER)are analyzed using a simulation.The simulation results show that the hybrid RF/FSO airborne communication exhibits better BER and OP performances than the single FSO link system.Moreover,it is observed that low-order M-PSK modulation can effectively improve the impact of atmospheric turbulence on hybrid RF/FSO airborne communication system.When signal-to-noise ratio is high,the cooperative diversity communication scheme improves the BER performance of the system better than the low-order modulation scheme.

关 键 词：光通信 RF/FSO通信系统 协作通信 Exponentiated Weibull分布模型 NAKAGAMI-M衰落信道 平均误码率 中断概率 

分 类 号：TN929.1[电子电信—通信与信息系统]