关键词: 无人机通信, 物理层安全, 全双工中继, 轨迹优化, 功率控制

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.

Key words: UAV communication, physical layer security, full-duplex relay, trajectory optimization, power control