Secure Multiuser Beamforming With Movable Antenna Arrays

2026-01-09

arXiv.org

AI Summary

This work proposes a secure transmission framework based on movable antenna arrays to address the limitations of conventional fixed antenna arrays in physical-layer security for multiuser wireless communications. By jointly optimizing digital beamforming and antenna positions, the proposed approach maximizes the system’s total secrecy rate. The design innovatively incorporates antenna mobility into physical-layer security, deriving an achievable secrecy rate expression grounded in secure channel coding theorems. A low-complexity joint optimization algorithm is developed by integrating fractional programming with block coordinate descent. Simulation results demonstrate that the proposed method significantly outperforms fixed-antenna schemes across various scenarios, effectively enhancing the total secrecy rate.

Technology Category

• Search and Optimization: Mixed Discrete/Continuous Search
• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Machine Learning: Optimization

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: User privacy protection in personalized systems

Abstract

A movable antennas (MAs)-enabled secure multiuser transmission framework is developed to enhance physical-layer security. Novel expressions are derived to characterize the achievable sum secrecy rate based on the secure channel coding theorem. On this basis, a joint optimization algorithm for digital beamforming and MA placement is proposed to maximize the sum secrecy rate via fractional programming and block coordinate descent. In each iteration, every variable admits either a closed-form update or a low-complexity one-dimensional or bisection search, which yields an efficient implementation. Numerical results demonstrate the effectiveness of the proposed method and show that the MA-enabled design achieves higher secrecy rates than conventional fixed-position antenna arrays.

Problem

• Secure Multiuser Beamforming
• Movable Antenna Arrays
• Physical-Layer Security
• Sum Secrecy Rate

Innovation

• Movable Antennas
• Secure Beamforming
• Physical-Layer Security
• Joint Optimization
• Sum Secrecy Rate