Robust Beamforming and Rate Optimization for RIS-Aided Symbiotic Radio Systems With RSMA

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-08-29 DOI:10.1109/LCOMM.2024.3451700

Yongjun Xu;Mingyang Wang;Yunjian Jia;Yi Jin;Ruiqian Ma;Yijie Mao;Chau Yuen

引用次数: 0

Abstract

In this letter, we propose a robust beamforming and rate optimization algorithm to improve spectral efficiency and transmission robustness by applying rate-splitting multiple access (RSMA) in reconfigurable intelligent surface (RIS)-aided symbiotic radio systems. Specifically, RSMA is used to serve all primary receivers on the same spectrum resource. Then, we formulate an optimization problem to minimize the total transmit power via the phase shift matrix of RIS, the beamforming vector of the base station, and the common rate parameter. To deal with this non-convex problem, we present an iteration-based optimization algorithm based on successive convex approximation and the alternating optimization method. Simulation results demonstrate that the proposed algorithm has 17.2% reduction in transmission power and 6.58% increase in the common rate compared to the other algorithms.

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带 RSMA 的 RIS 辅助共生无线电系统的稳健波束成形和速率优化

在这封信中，我们提出了一种稳健波束成形和速率优化算法，通过在可重构智能表面（RIS）辅助共生无线电系统中应用速率分割多路访问（RSMA）来提高频谱效率和传输稳健性。具体来说，RSMA 用于在同一频谱资源上为所有主接收器提供服务。然后，我们提出了一个优化问题，通过 RIS 的相移矩阵、基站的波束成形向量和通用速率参数来最小化总发射功率。为了解决这个非凸问题，我们提出了一种基于连续凸近似和交替优化法的迭代优化算法。仿真结果表明，与其他算法相比，所提算法的传输功率降低了 17.2%，共同速率提高了 6.58%。

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 Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. 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 communication systems.