Enabling Secure Wireless Communications via Movable Antennas

TL;DR

This paper introduces a secure wireless communication scheme using movable antennas to optimize positions for enhanced physical layer security, employing joint beamforming and antenna placement optimization.

Contribution

It proposes a novel secure transmission framework leveraging movable antennas with joint optimization algorithms, improving security over fixed-position antenna systems.

Findings

Significant security improvements over fixed antennas.

Effective joint optimization algorithms for antenna placement and beamforming.

Enhanced physical layer security demonstrated through numerical results.

Abstract

A pioneering secure transmission scheme is proposed, which harnesses movable antennas (MAs) to optimize antenna positions for augmenting the physical layer security. Particularly, an MA-enabled secure wireless system is considered, where a multi-antenna transmitter communicates with a single-antenna receiver in the presence of an eavesdropper. The beamformer and antenna positions at the transmitter are jointly optimized under two criteria: power consumption minimization and secrecy rate maximization. For each scenario, a novel suboptimal algorithm was proposed to tackle the resulting nonconvex optimization problem, capitalizing on the approaches of alternating optimization and gradient descent. Numerical results demonstrate that the proposed MA systems significantly improve physical layer security compared to various benchmark schemes relying on conventional fixed-position antennas (FPAs).