基于门限判断DF协议的多无人机中继传输中断性能分析  

Outage performance analysis for multi-UAV relay systems with threshold-based DF protocol

作　　者：淡振雷 吴雪雯 欧阳键 汪萧萧 顾晨伟 林敏[1] DAN Zhenlei;WU Xuewen;OUYANG Jian;WANG Xiaoxiao;GU Chenwei;LIN Min(College of Telecommunications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《电信科学》2020年第8期103-111,共9页Telecommunications Science

基　　金：重点国际合作项目(No.61720106003);上海航天科技创新基金资助项目(No.SAST2019-095);基础加强计划技术领域基金项目(No.2019-JCJQ-JJ-226);江苏省研究生科研与实践创新计划项目(No.SJCX19_0237)。

摘　　要：UAV(unmannedaerialvehicle,无人机)中继系统作为远距离数据传输的一种有效手段,成为当前无线通信领域的一个研究热点。首先在考虑路径损耗等实际参数的前提下,建立了基于多个UAV的中继协作传输系统模型,得到采用门限判断DF(decode-and-forward,译码转发)协议时系统的最大输出SNR(signal-to-noiseratio,信噪比)表达式。接着,假设上行链路和下行链路均服从Rician分布,推导出多UAV中继传输系统的中断概率闭合表达式,并且进一步得到了高信噪比条件下中断概率的渐近表达式、系统的分集度和阵列增益,为分析系统参数对中断性能的影响提供了更加便捷的方法。最后,计算机仿真验证了理论分析的正确性,并且定量分析了无人机中继个数、配置的天线数目以及中断阈值对系统中断性能的影响,为实际的系统设计和应用提供参考。The unmanned aerial vehicle(UAV)relay system has become a hot topic as an effective method for the remote transmission in wireless communications.By taking path loss into account,a relay cooperative transmission system model based on multiple UAVs was established firstly,and the maximum output signal-to-noise ratio(SNR)of the system with threshold-based decode-and-forward(DF)protocol was obtained.Then,by assuming that both the uplink and downlink experience Rician distribution,the closed-form expression for outage probability(OP)of the considered system with multiple UAVs was derived.Furthermore,the asymptotic OP formula at high SNR was also derived to show the diversity order and array gain of the considered system,which were convenient to reveal the effects of system parameters on the outage performance.Finally,the computer simulations verify the correctness of the theoretical analysis,and reveal the effect of the relay number,antenna number and the threshold on the system outage performance,thus the proposed scheme can provide guidance for the system design and application.

关 键 词：中继传输 无人机通信 译码转发 中断概率 性能分析 

分 类 号：TN925[电子电信—通信与信息系统]