Energy-Efficient Secure Communications via Joint Optimization of UAV Trajectory and Movable-Antenna Array Beamforming

TL;DR

This paper presents a joint optimization framework for UAV trajectory and movable-antenna array beamforming to enhance physical layer security and energy efficiency in wireless communications.

Contribution

It introduces a novel joint optimization method leveraging movable antennas on UAVs to improve security and energy efficiency in wireless systems.

Findings

Achieves higher secrecy energy efficiency compared to traditional methods.

Utilizes spatial degrees of freedom for directional beamforming and null formation.

Demonstrates significant security improvements through numerical simulations.

Abstract

This paper investigates the potential of unmanned aerial vehicles (UAVs) equipped with movable-antenna (MA) arrays to strengthen security in wireless communication systems. We propose a novel framework that jointly optimizes the UAV trajectory and the reconfigurable beamforming of the MA array to maximize secrecy energy efficiency, while ensuring reliable communication with legitimate users. By exploiting the spatial degrees of freedom enabled by the MA array, the system can form highly directional beams and deep nulls, thereby significantly improving physical layer security. Numerical results demonstrate that the proposed approach achieves superior secrecy energy efficiency, attributed to the enhanced spatial flexibility provided by the movable antenna architecture.