Power Minimization for Double Cooperative-RIS-Assisted Uplink NOMA System

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

IEEE Wireless Communications Letters Pub Date : 2023-08-02 DOI:10.1109/LWC.2023.3301172

Haochun Ma;Hong Wang;Haitao Zhao;Shen Fu

引用次数: 0

Abstract

As a cutting-edge technique of the sixth generation mobile communication, reconfigurable intelligent surface (RIS) is compatible with many existing technologies very well. In the existing literature, the inter-RIS reflecting signals are usually ignored for simplification. In this letter, we consider a double cooperative-RIS-assisted uplink non-orthogonal multiple access (NOMA) system with inter-RIS reflections. Then, we formulate an optimization problem of minimizing the total transmission power for cooperative-RIS-assisted NOMA uplinks. In order to simplify the original problem, we derive the relationship between the optimal transmission power and the phase shifts. Besides, a block coordinate descent (BCD) method is proposed to optimize the phase shifts of the two RISs alternatively. The simulation results show that the proposed optimization algorithm achieves better performance than the existing ones.

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双协同ris辅助上行NOMA系统的功率最小化

可重构智能表面(RIS)作为第六代移动通信的一项前沿技术，与许多现有技术具有很好的兼容性。在现有文献中，为了简化，通常忽略ris间反射信号。在这封信中，我们考虑了一个具有ris间反射的双合作ris辅助上行链路非正交多址(NOMA)系统。在此基础上，提出了ris辅助下NOMA上行链路总传输功率最小的优化问题。为了简化原问题，导出了最优传输功率与相移之间的关系。此外，还提出了一种块坐标下降法(BCD)来交替优化两个RISs的相移。仿真结果表明，所提出的优化算法比现有的优化算法具有更好的性能。

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.