NOMA-based RIS-IoV networks: Perspective of power allocations and RIS deployments

IF 2.2 4区计算机科学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Physical Communication Pub Date : 2025-08-12 DOI:10.1016/j.phycom.2025.102805

Jinyuan Gu , Biting Zhuo , Jinliang Huang , Feifei Song , Wei Duan

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引用次数: 0

Abstract

The paper compares the system performance of reconfigurable intelligent surface (RIS)-assisted non-orthogonal multiple access (NOMA) internet of vehicles (IoV) systems with different RIS deployment locations. Firstly, we distinguish two RIS deployment locations and two decoding schemes based on their corresponding NOMA power allocation coefficients. Then, using Jensen’s inequality, the upper bounds on the channel capacity of the two decoding schemes are derived. By considering the RIS location (from the base station to the RIS) and the geometric included angle of the near user-base station-RIS, as well as using the Taylor expansion of the binary function, we obtain an approximate expression for the RIS location that equalizes the upper bound of the two decoding schemes in the situation of high signal-to-noise ratio (SNR). In particular, when the channel gain difference between the two users’ direct links is too large, the gain provided by the RIS will be insufficient to bridge the gap in channel quality between the near and far users. Moreover, simulation results show that when both the distance and the angle are not fixed, the achievable sum-rates of the two decoding schemes will be equal when the RIS is at certain positions, which form a three-dimensional curve.

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基于noma的RIS- iov网络：功率分配和RIS部署的视角

本文比较了不同RIS部署位置下可重构智能表面（RIS）辅助非正交多址（NOMA）车联网系统的系统性能。首先，我们根据相应的NOMA功率分配系数区分两个RIS部署位置和两种解码方案。然后，利用Jensen不等式，导出了两种译码方案的信道容量上界。通过考虑RIS位置（从基站到RIS）和附近用户基站-RIS的几何夹角，利用二值函数的泰勒展开，得到了在高信噪比情况下，RIS位置的近似表达式，使两种译码方案的上界均衡。特别是，当两个用户直接链路之间的信道增益差过大时，RIS提供的增益将不足以弥补远近用户之间的信道质量差距。此外，仿真结果表明，当距离和角度不固定时，RIS在一定位置时，两种译码方案的可实现和率相等，形成三维曲线。

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

Physical Communication ENGINEERING, ELECTRICAL & ELECTRONICTELECO-TELECOMMUNICATIONS

CiteScore

5.00

自引率

9.10%

发文量

212

审稿时长

55 days

期刊介绍： PHYCOM: Physical Communication is an international and archival journal providing complete coverage of all topics of interest to those involved in all aspects of physical layer communications. Theoretical research contributions presenting new techniques, concepts or analyses, applied contributions reporting on experiences and experiments, and tutorials are published. Topics of interest include but are not limited to: Physical layer issues of Wireless Local Area Networks, WiMAX, Wireless Mesh Networks, Sensor and Ad Hoc Networks, PCS Systems; Radio access protocols and algorithms for the physical layer; Spread Spectrum Communications; Channel Modeling; Detection and Estimation; Modulation and Coding; Multiplexing and Carrier Techniques; Broadband Wireless Communications; Wireless Personal Communications; Multi-user Detection; Signal Separation and Interference rejection: Multimedia Communications over Wireless; DSP Applications to Wireless Systems; Experimental and Prototype Results; Multiple Access Techniques; Space-time Processing; Synchronization Techniques; Error Control Techniques; Cryptography; Software Radios; Tracking; Resource Allocation and Inference Management; Multi-rate and Multi-carrier Communications; Cross layer Design and Optimization; Propagation and Channel Characterization; OFDM Systems; MIMO Systems; Ultra-Wideband Communications; Cognitive Radio System Architectures; Platforms and Hardware Implementations for the Support of Cognitive, Radio Systems; Cognitive Radio Resource Management and Dynamic Spectrum Sharing.