Aerial reconfigurable intelligent surfaces-assisted full-duplex UAV secure communication

Abstract

In response to the limitations of traditional reconfigurable intelligent surfaces (RIS) in UAV-assisted secure communications, such as insufficient flexibility and inadequate system security, as well as the challenges of low spectral efficiency and poor communication efficiency faced by current half-duplex UAV communication systems, a dual-machine cooperative solution involving aerial reconfigurable intelligent surfaces (ARIS) and full-duplex UAV was proposed, aiming at enhancing communication security and efficiency against ground eavesdroppers. An optimization problem was designed to maximize the minimum average achievable security rate by jointly optimizing user communication scheduling, transmission power, the interference power sent by UAV, their flight trajectories, and the phase shifts and trajectories of ARIS. An iterative algorithm based on alternating optimization (AO), semi-definite relaxation (SDR) techniques, and successive convex approximation (SCA) was proposed to obtain high-quality suboptimal solutions. Simulation results demonstrate the effectiveness of the ARIS and full-duplex UAV combination in enhancing communication quality and security performance, showcasing its superiority in complex security communication environments.

Keywords

• UAV secure communication;aerial reconfigurable intelligent surface;trajectory optimization;full-duplex