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arXiv 2602.23769eess.SP
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灵活天线阵列形状与波束成形的联合优化以实现安全通信

Joint Optimization of Flexible Antenna Array Shape and Beamforming for Secure Communication

Sun Yat-Sen University(中山大学);The University of Sydney(悉尼大学);University of Surrey(萨里大学)

Zhen Xu, Gaojie Chen, Jing Zhu, Weiwei Zhao, Yonghui Li, Rahim Tafazolli, Wei Huang

AI总结:

本文提出通过联合优化灵活天线阵列形状与波束成形,提升无线通信的安全性。

摘要:

灵活天线阵列(FAAs)可以物理上重塑其几何形状以增加新的空间自由度,而发射波束成形通过调整复数元素权重来电子地定向和塑造阵列的辐射图案,从而显著提高通信性能。本文首次探索了将FAA几何控制与波束成形结合以增强物理层安全性的方法,其中配备FAA的基站在存在被动窃听者的情况下与合法用户通信。为了保护机密传输,我们提出了一个新的保密率最大化问题,该问题联合优化发射波束成形向量和连续的FAA形状控制参数。由于问题的非凸性质,开发了一种交替优化算法,将联合设计分解为可处理的子问题,这些子问题通过迭代求解来优化FAA的几何形状和波束成形策略。仿真结果证实,所提出的联合优化框架显著优于传统固定形状或仅波束成形的方案,展示了FAA启用的可重构性在安全无线通信中的潜力。

英文摘要:

Flexible antenna arrays (FAAs) can physically reshape their geometry to add new spatial degrees of freedom, whereas transmit beamforming adjusts the complex element weights to electronically steer and shape the array's radiation pattern, thereby significantly improving communication performance. This paper is the first to explore the integration of FAA geometry control and beamforming for physical layer security enhancement, where a base station equipped with an FAA communicates with a legitimate user in the presence of passive eavesdroppers. To safeguard confidential transmissions, we formulate a new secrecy rate maximization problem that jointly optimizes the transmit beamforming vector and a continuous FAA shape control parameter. Due to the non convex nature of the problem, an alternating optimization algorithm is developed to decompose the joint design into tractable subproblems, which are solved iteratively to refine both the FAA geometry and beamforming strategy. Simulation results confirm that the proposed joint optimization framework significantly outperforms conventional fixed shape or beamforming only schemes, demonstrating the potential of FAA enabled reconfigurability for secure wireless communications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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