Movable-Antenna-Enhanced Physical-Layer Service Integration: Performance Analysis and Optimization

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2025-06-27 DOI:10.1109/LWC.2025.3583938

Xuanlin Shen;Xin Wei;Weidong Mei;Zhi Chen;Jun Fang;Boyu Ning

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引用次数: 0

Abstract

Movable antennas (MAs) have drawn increasing attention in wireless communications due to their capability to create favorable channel conditions via local movement within a confined region. In this letter, we investigate its application in physical-layer service integration (PHY-SI), where a multi-MA base station (BS) simultaneously transmits both confidential and multicast messages to two users. The multicast message is intended for both users, while the confidential message is intended only for one user and must remain perfectly secure from the other. Our goal is to jointly optimize the secrecy and multicast beamforming, as well as the MAs’ positions at the BS to maximize the secrecy rate for one user while satisfying the multicast rate requirement for both users. To gain insights, we first conduct performance analysis of this MA-enhanced PHY-SI system in two special cases, revealing its unique characteristics compared to conventional PHY-SI with fixed-position antennas (FPAs). To address the secrecy rate maximization problem, we propose a two-layer optimization framework that integrates the semidefinite relaxation (SDR) technique and a discrete sampling algorithm. Numerical results demonstrate that MAs can greatly enhance the achievable secrecy rate region for PHY-SI compared to FPAs.

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移动天线增强物理层业务集成：性能分析与优化

可移动天线（MAs）由于能够在有限区域内通过局部移动创造有利的信道条件，在无线通信中引起了越来越多的关注。在这封信中，我们研究了它在物理层业务集成（PHY-SI）中的应用，其中一个多ma基站（BS）同时向两个用户传输机密和多播消息。多播消息用于两个用户，而机密消息仅用于一个用户，并且必须对另一个用户保持完全安全。我们的目标是共同优化保密和组播波束形成，以及MAs在BS的位置，以最大限度地提高一个用户的保密率，同时满足两个用户的组播速率要求。为了深入了解，我们首先在两种特殊情况下对这种ma增强的PHY-SI系统进行了性能分析，揭示了其与具有固定位置天线（fpa）的传统PHY-SI相比的独特特性。为了解决保密率最大化问题，我们提出了一种结合半定松弛（SDR）技术和离散采样算法的两层优化框架。数值结果表明，与FPAs相比，MAs可以大大提高PHY-SI的可实现保密率区域。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.