Joint Receive and Passive Beamforming Optimization for RIS-Assisted Uplink RSMA Systems

IF 4.6 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS

IEEE Wireless Communications Letters Pub Date : 2023-04-13 DOI:10.1109/LWC.2023.3266883

Qiang Sun;Hongwu Liu;Shen Yan;Theodoros A. Tsiftsis;Jinhong Yuan

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引用次数: 1

Abstract

In this letter, we investigate the joint optimization of transmit power allocation and receive/passive beamforming in a reconfigurable intelligent surface (RIS)-assisted uplink two-user rate-splitting multiple access (RSMA) system. Aiming at maximizing the achievable rate of one user subject to another user’s quality of service (QoS) requirements, RIS is deployed to assist the uplink transmissions from both users to a multi-antenna base station (BS). We decouple the non-convex rate maximization problem into three sub-problems and propose an alternating optimization (AO) algorithm to optimize the receive/passive beamforming and transmit power allocation. A closed-form expression is derived for the sub-problem of transmit power allocation by using the optimal decoding order and the concave-convex fractional programming beamforming problems are converted to convex ones by using the Charnes-Cooper transform. Then, a penalty term approach is applied to effectively solve the rank-1 constrained beamforming subproblems. Simulation results verify that the proposed AO algorithm attains a higher achievable rate than the existing benchmark schemes.

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ris辅助上行RSMA系统联合接收和无源波束成形优化

在本文中，我们研究了可重构智能表面(RIS)辅助上行双用户分速多址(RSMA)系统中发射功率分配和接收/无源波束形成的联合优化。为了在满足另一个用户对服务质量(QoS)要求的前提下，最大限度地提高一个用户的可达速率，部署RIS来辅助两个用户向多天线基站(BS)的上行传输。我们将非凸速率最大化问题解耦为三个子问题，并提出了一种交替优化算法来优化接收/被动波束形成和发射功率分配。利用最优解码顺序导出了发射功率分配子问题的封闭表达式，并利用chares - cooper变换将凹凸分式规划波束形成问题转化为凸波束形成问题。然后，采用罚项方法有效地解决了秩1约束波束形成子问题。仿真结果表明，该算法比现有的基准算法具有更高的可达率。

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.