中文摘要：

基于无人飞行器（unmanned aerial vehicle,UAV）的中继传输系统为远距离数据传递提供可靠高效的无线链路,是当前通信领域的一个研究热点。本文首先建立基于UAV的双跳放大转发（amplify-and-forward,AF）中继链路传输模型,得到等效的输出信噪比（signal-to-noise ratio,SNR）表达式;接着提出最大化互信息量准则下的最优波束形成及功率分配方案,并进一步推导出双跳中继系统中断概率和遍历容量的解析表达式;最后计算机仿真不仅验证了所提出的优化方案和性能分析的有效性,而且证明了UAV中继平台配置多天线和优化设计所具有的优越性。

英文摘要：

The relay transmission system using unmanned aerial vehicle （UAV） has received much attention recently, since it can provide reliable and efficient wireless connectivity for the remote transmission between two separated nodes. A two-hop amplify and-forward （AF） relay transmission model based on the UAV is set up firstly, and the expression of equivalent signal-to-noise ratio （SNR） is obtained. Then, a novel scheme joint op- timal beamforming with power allocation is proposed to maximize the mutual information of the relay system. Next, the analytical expressions of the outage probability and the ergodic capacity are derived to investigate the system performance efficiently. Finally, computer simulation results prove that not only the validity of the pro posed scheme and the performance analysis is examined, but also the superiority of the employed multiple antennas as well as the optimal design is confirmed.