存在干扰下的多无人机中继波束形成策略

无人机（Unmanned aerial vehicle, UAV）作为空中中继平台能够快速、方便地建立起一条可靠高效的数据传输链路,在应急通信等领域受到了国内外学者的广泛关注。为提升存在干扰下的基于放大转发的多UAV中继传输系统的通信质量和性能,本文提出了两种波束形成（Beamforming, BF）策略。首先给出地面接收端信干噪比和可达速率的理论表达式;然后分别建立以UAV中继总功率最小化和可达速率最大化为准则的优化问题,推导出了相应的最优BF权向量的解析表达式;最后,计算机仿真验证了所提BF策略的正确性和有效性。

Beamforming Schemes for Multiple-UAV Relay System with Interferences

Unmanned aerial vehicles (UAVs) as relaying can establish a reliable and efficient data transmission link and is used in the field of emergency communications. By considering the interferences at the amplify-and-forward UAV relays, two beamforming (BF) strategies are proposed to improve the communication quality and performance. The expressions of signal-to-interference-and-noise ratio and achievable rate at the ground receiver are first presented. Then, two optimization problems are formulated, namely total relay transmit power minimization and achievable rate maximization, and the corresponding BF schemes is designed to obtain the optimal BF analytical expressions. Finally, the effectiveness and validity of the proposed BF schemes are verified by simulations.