Abstract

This paper studies a new wireless surveillance scenario, where a legitimate monitor attempts to eavesdrop on the dubious messages forwarded by an unmanned aerial vehicle (UAV)-aided suspicious relay. Specifically, we consider two relaying protocols commonly used by the UAV-aided relay, namely, amplify-and-forward (AF) and decode-and-forward (DF). For each relaying protocol, we maximize the average effective eavesdropping rate by optimizing the legitimate monitor’s jamming power allocation, subject to the average power constraint. The optimal jamming power allocation solutions are derived in closed-form for each of the two protocols, respectively. Numerical results show that the proposed proactive eavesdropping approach can noticeably improve the eavesdropping rate compared to the reference schemes.

中文翻译：

---

无人机辅助移动中继系统中的主动监听

摘要

本文研究了一种新的无线监视方案，其中合法监视器试图窃听无人飞行器（UAV）辅助的可疑中继转发的可疑消息。具体而言，我们考虑了无人机辅助中继通常使用的两种中继协议，即放大转发（AF）和解码转发（DF）。对于每个中继协议，我们会根据平均功率约束，通过优化合法监控器的干扰功率分配来最大程度地提高平均有效窃听率。最优干扰功率分配解决方案分别针对两种协议中的每种以封闭形式导出。数值结果表明，与参考方案相比，所提出的主动窃听方法可以显着提高窃听率。