无人机辅助可疑中继系统下的主动窃听

Proactive eavesdropping in UAV-aided suspicious relay systems

针对可疑用户可能部署无人机从事侵犯他人隐私,危害公共安全等行为的问题,文中研究了无人机辅助可疑中继系统下的无线监听,其中合法监视器采用主动窃听方式监视可疑链路并窃听可疑信息。基于平均干扰功率的限制,构建以平均窃听速率最大化为目标的优化问题。首先证明了该优化问题满足时分特性(time-sharing property),从而能够保证对偶间隙为0。然后基于拉格朗日对偶问题,推导得出最优干扰功率分配方案。仿真结果表明,采用该主动窃听方案能够有效提高平均窃听速率。

Aimed at the problem that suspicious users may deploy unmanned aerial vehicles (UAVs) to invade the privacy of others and jeopardize the public safety,a wireless surveillance in UAV-aided suspicious relay system is studied,where the legitimate monitor aims to eavesdrop on suspicious links and messages with the proactive eavesdropping approach.Subject to the average power constraint,an optimization problem is formulated to maximize the average eavesdropping rate.Firstly,it is proved that the optimization problem satisfies the time-sharing property,thus guaranteeing a zero duality gap.Then,the optimal jamming power allocation is derived from the Lagrange dual problem.Numerical results show that the proactive eavesdropping approach can effectively improve the average eavesdropping rate.