Joint trajectory and power optimization for mobile jammer-aided secure UAV relay network

This paper investigates the achievable average secrecy rate for a mobile jammer-aided secure unmanned aerial vehicle (UAV) relaying system. Specifically, one UAV is deployed as relay to support the communications between a source node and a destination node. An additional cooperative UAV is dispatched to enhance security by transmitting an the interference signal to interfere with any suspicious eavesdropping. With the objective of enhancing secrecy against eavesdropping, an optimization problem for jointly optimizing the time scheduling, transmit power, and UAV's trajectory is formulated while considering the energy-constrained condition of rotary-wing UAV. As the corresponding optimization problem is mixed-integer non-convex, we propose an iterative algorithm to efficiently solve this optimization problem by applying successive convex optimization and block coordinate descent techniques to derive a locally optimal solution. Simulation results demonstrate the effectiveness of the proposed algorithm compared with benchmark algorithms. (C) 2021 Elsevier Inc. All rights reserved.