Transmit Power Minimization for IRS-Assisted Hierarchical Rate-Splitting Multiple Access Systems

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2025-02-18 DOI:10.1109/LWC.2025.3543172

Ting Qi;Bin Lyu;Changsheng You

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引用次数: 0

Abstract

Rate-splitting multiple access (RSMA) and intelligent reflecting surface (IRS) are powerful techniques for satisfying diverse quality of service (QoS) requirements in future wireless networks. In this letter, we propose an efficient hierarchical rate-splitting (HRS) transmission scheme tailored for IRS-assisted multiple-input single-output systems. Specifically, we formulate an optimization problem to minimize the transmit power by jointly designing the user clustering, common rate distribution, transmit beamforming and IRS passive beamforming. In particular, we propose a low-complexity user clustering method by taking into account the QoS diversity and channel similarity of users. Then, we decompose the original non-convex problem into two subproblems and adopt the alternating optimization algorithm. The subproblems for optimizing the beamformer, common rate allocation, and IRS phase shift, efficiently solved by using successive convex approximation and semi-definite relaxation algorithms. Simulation results show that the proposed scheme can significantly reduce the transmit power compared with various benchmarks.

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irs辅助分层分频多址系统的发射功率最小化

分频多址（RSMA）和智能反射面（IRS）是未来无线网络中满足多样化服务质量（QoS）需求的有力技术。在这封信中，我们提出了一个有效的分层速率分割（HRS）传输方案，为irs辅助的多输入单输出系统量身定制。具体来说，我们通过联合设计用户聚类、共速率分布、发射波束形成和IRS无源波束形成，制定了一个最小化发射功率的优化问题。特别是，我们提出了一种考虑用户QoS多样性和信道相似性的低复杂度用户聚类方法。然后，将原非凸问题分解为两个子问题，并采用交替优化算法。采用连续凸近似和半定松弛算法有效地解决了波束形成器优化、共速率分配和IRS相移等子问题。仿真结果表明，与各种基准测试相比，该方案可以显著降低发射功率。

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 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.