Hybrid Active-Passive STAR-RIS-Based NOMA Systems: Energy/Rate-Reliability Trade-Offs and Rate Adaptation

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Wireless Communications Letters Pub Date : 2024-11-14 DOI:10.1109/LWC.2024.3497978

Thai-Hoc Vu;Tan N. Nguyen;Tien-Tung Nguyen;Sunghwan Kim

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Abstract

This letter proposes efficient analytical frameworks to evaluate energy/rate-reliability trade-offs and rate adaptation of hybrid active-passive simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-based non-orthogonal multiple access systems. Under Nakagami-m fading channels and imperfect successive interference cancellation, closed-form approximations for the outage probability and energy efficiency are derived. Based on the asymptotic expressions at high signal-to-noise-ratio and low-rate regions, diversity orders and coding gain are provided, along with trade-offs between energy/rate and reliability. Besides, we also develop rate and energy-reliability expressions and closed-form solutions for allocating power resources to achieve user rate fairness and sum-rate maximization. Monte Carlo simulations corroborate the proposed frameworks, identify operating points for prioritizing passive, active, or hybrid STAR-RISs from energy perspectives, and clarify how to configure STAR-RIS elements to improve energy/rate-reliability and power allocation policy.

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基于 STAR-RIS 的主动-被动混合 NOMA 系统：能量/速率-可靠性权衡与速率自适应

这封信提出了有效的分析框架来评估混合主动式被动同时发射和反射可重构智能表面（STAR-RIS）的非正交多址系统的能量/速率可靠性权衡和速率适应性。在Nakagami-m衰落信道和不完全连续干扰对消条件下，导出了中断概率和能量效率的封闭近似。基于高信噪比和低速率区域的渐近表达式，给出了分集阶数和编码增益，以及能量/速率和可靠性之间的权衡。此外，我们还开发了费率和能源可靠性表达式以及电力资源分配的封闭式解决方案，以实现用户费率公平和和费率最大化。蒙特卡罗模拟验证了所提出的框架，从能源角度确定了被动、主动或混合STAR-RIS的优先操作点，并阐明了如何配置STAR-RIS元件以提高能源/速率可靠性和电力分配策略。

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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.