Movable Antenna Aided Physical Layer Security with No Eavesdropper CSI

TL;DR

This paper introduces a movable antenna system that enhances physical layer security by optimizing antenna positions and joint beamforming without needing eavesdropper CSI, outperforming fixed antennas.

Contribution

It proposes a novel movable antenna framework with a joint beamforming and jamming scheme that improves secrecy rates without eavesdropper CSI.

Findings

MA-based framework outperforms fixed antennas in security

Gradient-based method effectively optimizes antenna positions

Enhanced secrecy transmission rate demonstrated through simulations

Abstract

A novel movable antenna (MA)-aided secure transmission framework is proposed to enhance the secrecy transmission rate without relying on the eavesdropper's channel state information. Within this framework, a joint beamforming and jamming scheme is proposed, where the power of the confidential signal is minimized by optimizing the positions of the MAs, and the residual power is used to jam the eavesdropper. An efficient gradient-based method is employed to solve this non-convex problem. Numerical results are provided to demonstrate the superiority of the MA-based framework over systems using traditional fixed-position antennas in secure transmission.