STAR-IRS Assisted Rate Splitting Multiple Access with Perfect and Imperfect CSI for 6G Communication

IF 1.3 4区工程技术 Q3 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Latin America Transactions Pub Date : 2024-12-19 DOI:10.1109/TLA.2025.10810403

Aswini Krishnan;Sundaresan Sabapathy;Surendar Maruthu

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Abstract

Incorporating cutting-edge technology like rate splitting multiple access (RSMA) and intelligent reflecting surface (IRS) are essential in 6G communications to satisfy the constantly growing needs for more connection, better reliability, and faster data rates. This paper explores the concept of simultaneously transmitting and reflecting IRS (STAR-IRS) assisted RSMA in the presence of both perfect and imperfect channel state information (CSI). STAR-IRS leverages its dual capability to transmit and reflect signals simultaneously, enhancing spectral efficiency and expanding coverage. So far, in literature, STAR-IRS assisted RSMA system is analyzed in terms of outage probability with perfect CSI scenario. So, in this work, we carry out the performance analysis of STAR-IRS in terms of outage probability and sum rate. Firstly, we derive the analytical expression of the outage probability and sum rate. Secondly, we propose a automatic optimization (AO) algorithm for weighted sum rate (WSR) maximization. The performance analysis is carried out by varying power allocation factor to find its optimality. The derived outage probability and sum rate expressions are validated with Monte Carlo simulations. Also, it is found that on using WSR maximization, the sum rate is enhanced for STAR-IRS based RSMA system when compared with the conventional sum rate maximization.

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为满足对更多连接、更高可靠性和更快数据传输速率不断增长的需求，在 6G 通信中采用速率分裂多路存取（RSMA）和智能反射面（IRS）等尖端技术至关重要。本文探讨了在完美和不完美信道状态信息（CSI）同时存在的情况下，同时发射和反射 IRS（STAR-IRS）辅助 RSMA 的概念。STAR-IRS 利用其同时发射和反射信号的双重能力，提高了频谱效率并扩大了覆盖范围。迄今为止，文献中的 STAR-IRS 辅助 RSMA 系统都是在完美 CSI 情况下分析中断概率的。因此，在本研究中，我们从中断概率和总和率两个方面对 STAR-IRS 进行性能分析。首先，我们推导出中断概率和总和率的分析表达式。其次，我们提出了加权总和率（WSR）最大化的自动优化（AO）算法。通过改变功率分配系数进行性能分析，以找到其最优性。得出的中断概率和总和率表达式通过蒙特卡罗模拟进行了验证。同时发现，与传统的和率最大化相比，使用 WSR 最大化时，基于 STAR-IRS 的 RSMA 系统的和率得到了提高。

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 Latin America Transactions COMPUTER SCIENCE, INFORMATION SYSTEMS-ENGINEERING, ELECTRICAL & ELECTRONIC

CiteScore

3.50

自引率

7.70%

发文量

192

审稿时长

3-8 weeks

期刊介绍： IEEE Latin America Transactions (IEEE LATAM) is an interdisciplinary journal focused on the dissemination of original and quality research papers / review articles in Spanish and Portuguese of emerging topics in three main areas: Computing, Electric Energy and Electronics. Some of the sub-areas of the journal are, but not limited to: Automatic control, communications, instrumentation, artificial intelligence, power and industrial electronics, fault diagnosis and detection, transportation electrification, internet of things, electrical machines, circuits and systems, biomedicine and biomedical / haptic applications, secure communications, robotics, sensors and actuators, computer networks, smart grids, among others.