Movable Antenna-Enhanced Secure Communication: Opportunities, Challenges, and Solutions

2025-08-31

AI Summary

The broadcast nature of wireless communications renders them inherently vulnerable to eavesdropping and interference; while fixed-position antenna (FPA) arrays can enhance physical-layer security, they suffer from high hardware cost and rigid channel correlation constraints. To address these limitations, this work proposes a novel mobile antenna (MA)-assisted secure communication paradigm: by dynamically repositioning antennas in space, the system actively engineers channel disparities between legitimate users and eavesdroppers/interferers, thereby overcoming FPA’s fundamental limits in channel correlation and degrees of freedom. We develop an integrated framework jointly optimizing MA array modeling, position-driven channel correlation control, low-overhead channel acquisition, and secure beamforming—significantly improving secrecy rate and interference resilience. The paper systematically identifies key challenges for MA-enabled security, proposes implementable technical solutions, and outlines future research directions, including co-design of motion control, channel estimation, and security optimization.

Technology Category

• Multiagent Systems: Agent Communication
• Application Domains: Mobility, Driving & Flight
• Intelligent Robots: Motion and Path Planning

Application Category

• Security and Privacy: Large-scale security measurements
• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• User Modeling, Personalization and Recommendation: Attacks and countermeasures in recommendation systems

Abstract

The broadcast nature of wireless communication renders it inherently vulnerable to security threats such as jamming and eavesdropping. While traditional array beamforming techniques help to mitigate these threats, they usually incur high hardware and processing costs, particularly in large-scale arrays with fixed-position antennas (FPAs). In contrast, movable antenna (MA) arrays can fully exploit the channel variation in spatial regions by enabling flexible antenna movement, which has emerged as a promising technology for secure communications. This article provides a magazine-type overview of MA-aided secure communications. Specifically, we first illuminate the promising application scenarios for MA-enhanced secure communication systems. Then, we examine the security advantages of MAs over conventional FPA systems, fundamentally stemming from their ability to adjust channel correlations between legitimate users, eavesdroppers, and jammers. Furthermore, we discuss important technical challenges and their potential solutions related to MA hardware architecture, channel acquisition, and antenna position optimization to realize secure transmissions. Finally, several promising directions for MA-aided secure communications are presented to inspire future research.

Problem

• Enhancing wireless security against jamming and eavesdropping threats
• Overcoming hardware limitations of fixed-position antenna arrays
• Optimizing movable antenna positioning for secure transmission performance

Innovation

• Movable antenna arrays enable flexible spatial channel variation
• Adjusting channel correlations enhances security over fixed antennas
• Optimizing antenna positions mitigates jamming and eavesdropping threats