RIS-NOMA communications over Nakagami-m fading with imperfect successive interference cancellation

IF 4.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

Computer Communications Pub Date : 2024-08-22 DOI:10.1016/j.comcom.2024.107926

Jinyuan Gu , Mingxing Wang , Wei Duan , Lei Zhang , Huaiping Zhang

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引用次数: 0

Abstract

Considering imperfect successive interference cancellation (SIC) for non-orthogonal multiple access (NOMA) communications, this work studies the cooperative reconfigurable intelligent surface (RIS)- and relay-assisted system under Nakagami-m fading. We focus on the performance comparison for such cooperative schemes, under different channel conditions and system parameters. In addition, we analyze the minimum required RIS elements number of the RIS-assisted scheme to achieve the same performance of the relay-assisted scheme with given signal-to-noise ratio (SNR). The cases of the optimal continuous phase shift and discrete phase shift designs of RIS are also discussed. We make a comparison between them, aiming to study the impact of the residual phase errors on performance. Specially, we compare the active RIS and passive RIS with the same system power constraint. Simulation results demonstrating the reliability of the analysis, validate that the relay-assisted scheme is superior to that of RIS-assisted one when the RIS elements number is small and transmitted power is lower. The results also confirm that the deployment of RIS should consider the actual situation of the application scenario.

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具有不完美连续干扰消除功能的中上衰减 RIS-NOMA 通信

考虑到非正交多址（NOMA）通信中不完善的连续干扰消除（SIC），本研究对中上衰落条件下的可重构智能表面（RIS）和中继辅助合作系统进行了研究。我们重点研究了这种合作方案在不同信道条件和系统参数下的性能比较。此外，我们还分析了在给定信噪比（SNR）条件下，RIS 辅助方案要达到中继辅助方案的相同性能，所需的最小 RIS 元数。我们还讨论了 RIS 的最佳连续相移和离散相移设计的情况。我们对它们进行了比较，旨在研究残余相位误差对性能的影响。特别是，我们对具有相同系统功率约束的有源 RIS 和无源 RIS 进行了比较。仿真结果证明了分析的可靠性，并验证了当 RIS 元数较少且传输功率较低时，中继辅助方案优于 RIS 辅助方案。结果还证实，部署 RIS 时应考虑应用场景的实际情况。

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.