【摘要】 针对全双工无人机中继通信系统的物理层安全通信问题，提出一种基于发射功率及无人机飞行轨迹的联合优化方案。在发射功率及飞行轨迹受限条件下，构建最大化系统保密速率的联合优化问题。将无法直接求解的非凹联合优化原问题拆分为发射功率及飞行轨迹优化两个子问题，采用连续凸逼近法将子问题转化为可求解的凹问题，设计迭代算法给出联合优化问题的数值解。仿真结果表明：所提优化方案与其他匀速飞行方案相比，可以显著提高全双工无人机中继通信系统的保密速率。更多还原

【Abstract】 Aiming at the physical layer security of a full-duplex UAV relaying system, a novel scheme based on the joint optimization of the transmit power and UAV flight trajectory is proposed. Under the condition of limited transmit power and flight trajectory, a joint optimization that maximizing the average secrecy rate of the system is constructed. The non-concave problem that cannot be solved directly is resolved into two sub-problems of transmit power and flight trajectory optimization, which can be transformed into the concave problem by the successive convex approximation method. An iterative algorithm is proposed to obtain the numerical solution of the joint optimization problem. The simulation results show that compared with other uniform flight schemes, the proposed optimization scheme can significantly improve the secrecy rate of the full-duplex UAV relay communication system.更多还原