Security optimization and beamforming design for active RIS-assisted UAV relaying NOMA networks

IF 4.3 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

Computer Communications Pub Date : 2025-06-02 DOI:10.1016/j.comcom.2025.108220

Ruoyu Zhang , Songlin Cheng , Niansheng Chen , Guangyu Fan , Lei Rao , Xiaoyong Song , Dingyu Yang

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引用次数: 0

Abstract

Physical layer security (PLS) in non-orthogonal multiple access (NOMA) networks faces critical challenges, especially for eavesdropping risk of cell-edge users in conventional passive reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicles (UAV) relaying systems, which may be increased because of channel sharing and multiplicative fading. Unlike ground-based RIS deployments limited by installation constraints and multi-path signal degradation, this work proposes an active RIS-assisted UAV (U-ARIS) for multi-user multiple-input single-output (MU-MISO) NOMA systems with two legitimate users and one eavesdropper. Moreover, we formulate a joint optimization problem to maximize sum secrecy rate by coordinating base station beamforming and U-ARIS reflection beamforming. Due to the multivariate nature of optimization variables and complex non-convexity, an alternating optimization (AO) algorithm is designed to decompose the problem into two sub-problems, which can be solved by semidefinite relaxation (SDR) and successive convex approximation (SCA). Simulations demonstrate that the proposed U-ARIS-assisted NOMA scheme achieves secrecy rate improvements of 12.5% and 50% compared to UAV-passive RIS (U-PRIS) and conventional OMA systems, respectively.

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主动ris辅助无人机中继NOMA网络的安全优化与波束形成设计

非正交多址（NOMA）网络的物理层安全（PLS）面临着严峻的挑战，特别是在传统无源可重构智能表面（RIS）辅助无人机（UAV）中继系统中，由于信道共享和乘衰落，可能会增加蜂窝边缘用户的窃听风险。与受安装约束和多路径信号退化限制的地面RIS部署不同，该工作提出了一种用于多用户多输入单输出（MU-MISO） NOMA系统的主动RIS辅助无人机（U-ARIS），该系统具有两个合法用户和一个窃听者。此外，通过协调基站波束形成和U-ARIS反射波束形成，提出了一个最大化总保密率的联合优化问题。针对优化变量的多变量性和复杂非凸性，设计了交替优化算法，将问题分解为两个子问题，分别采用半定松弛（SDR）和逐次凸逼近（SCA）求解。仿真结果表明，与无人机被动RIS （U-PRIS）和传统OMA系统相比，该方案的保密率分别提高了12.5%和50%。

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

Computer Communications 工程技术-电信学

CiteScore

14.10

自引率

5.00%

发文量

397

审稿时长

66 days

期刊介绍： Computer and Communications networks are key infrastructures of the information society with high socio-economic value as they contribute to the correct operations of many critical services (from healthcare to finance and transportation). Internet is the core of today''s computer-communication infrastructures. This has transformed the Internet, from a robust network for data transfer between computers, to a global, content-rich, communication and information system where contents are increasingly generated by the users, and distributed according to human social relations. Next-generation network technologies, architectures and protocols are therefore required to overcome the limitations of the legacy Internet and add new capabilities and services. The future Internet should be ubiquitous, secure, resilient, and closer to human communication paradigms. Computer Communications is a peer-reviewed international journal that publishes high-quality scientific articles (both theory and practice) and survey papers covering all aspects of future computer communication networks (on all layers, except the physical layer), with a special attention to the evolution of the Internet architecture, protocols, services, and applications.