Energy Efficiency Maximization for Full-Duplex UAV Secrecy Communication

Abstract

This paper proposes a new full-duplex (FD) secrecy communication scheme for the unmanned aerial vehicle (UAV) and investigates its optimal design to achieve the maximum energy efficiency (EE) of the UAV. Specifically, the UAV receives the confidential information from a ground source and meanwhile sends jamming signals to interfere with a potential ground eavesdropper. As the UAV has limited on-board energy in practice, we aim to maximize the EE for its secrecy communication, by jointly optimizing the UAV trajectory and the source/UAV transmit/jamming powers over a finite flight period. Although the formulated problem is difficult to be optimally solved due to its non-convexity, we propose an efficient iterative algorithm to obtain its high-quality suboptimal solution. Simulation results show that significant EE improvements can be achieved via joint optimization and the EE gains highly depend on the capability of the self-interference cancelation at the UAV.