基于共道干扰的多无人机中继通信系统研究

Research on Multi-unmanned Aerial Vehicle Relay Communication System Based on Co-channel Interference

无人机中继具备高速机动性,能够实时完成通信任务。随着无人机造价越来越低廉、各项性能不断优化以及中继体积的逐渐微型化,无人机搭载微型中继的协作通信系统在通信系统中表现出巨大优势。为了满足众多新型通信场景对通信覆盖范围的需求,考虑无人机中继和目的节点处存在多路共道干扰的情况下,分析无人机协作通信的系统性能。在多无人机中继通信场景中,为提高频谱资源利用率和保障信号传输的稳定性,选择通信链路最优的无人机中继采用解码转发协议向目的节点传送信息。在此基础上,推导了系统中断概率和信道容量的精确表达式,同时为了深入研究各项参数对通信性能的影响,推导了高信噪比下的渐近中断概率。结果显示,增加无人机中继数量可以弥补共道干扰引起的系统性能下降,进一步提升系统性能。

Unmanned aerial vehicle relay has high-speed mobility and can fulfill real-time communication requirements.With the decrease of the unmanned aerial vehicle cost,continuous optimization of various performances and gradual miniaturization of relay volume,the cooperative communication of unmanned aerial vehicle equipped with micro relay shows great advantages in communication systems.In order to satisfy the requirement of communication coverage in many new communication scenarios,the system performance of unmanned aerial vehicle cooperative communication is analyzed,which considers the situation that multi-channel interference exists at the relay and destination node of unmanned aerial vehicle.In the multi-unmanned aerial vehicle relay communication scenario,in order to improve the utilization rate of spectrum resources and ensure the stability of signal transmission,the unmanned aerial vehicle relay with the optimal communication link is selected to transmit information to the destination node using the decode-and-forward protocol.On this basis,accurate analytical expressions for the outage probability and channel capacity of the system are derived,and the asymptotic interrupt probability under high signal to interference plus noise ratio is also derived in order to further study the influence of various parameters on the communication performance.The results show that increasing the number of unmanned aerial vehicle relays can compensate for the system performance degradation caused by co-channel interference and further improve the system performance.