Joint Beamforming and Power Splitting Optimization for RIS-Assited Cooperative SWIPT NOMA Systems

被引：12

作者：

Liu, Qiuyan ^{[1
]}

Lu, Manchun ^{[2
]}

Li, Na ^{[2
]}

Li, Meng ^{[2
]}

Li, Fuchang ^{[1
]}

Zhang, Zhonghao ^{[1
]}

机构：

[1] China United Network Commun Corp Ltd, Res Inst, Beijing 100048, Peoples R China

[2] Beijing Univ Posts & Telecommun, Beijing 100876, Peoples R China

来源：

2022 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC) | 2022年

基金：

国家重点研发计划;

关键词：

Reconfigurable intelligent surface (RIS); simultaneous wireless information and power transfer (SWIPT); cooperative non-orthogonal multiple access (C-NOMA); NONORTHOGONAL MULTIPLE-ACCESS;

D O I：

10.1109/WCNC51071.2022.9771850

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

In this paper, reconfigurable intelligent surface (RIS) is utilized to enhance the performance of the cooperative non-orthogonal multiple access (C-NOMA). The simultaneous wireless information and power transfer (SWIPT) technology is adopted at the cell-center user to relay information to the cell-edge user. We aim to maximize the data rate of the cell-edge user by jointly optimizing the beamforming vectors, the reflecting phase shifts, the power splitting (PS) ratio and the relaying power under the energy constraint and minimum data rate constraint of the cell-center user. To solve the established non-convex problem, an iterative algorithm based on alternate optimization is proposed to decompose the original problem into three sub-problems. In addition, successive convex approximation (SCA) and semidefinite relaxation (SDR) techniques are also employed to solve the sub-problems. Simulation results illustrate that the proposed RIS-assisted cooperative SWIPT NOMA scheme can effectively improve the performance of the cell-edge user compared with the traditional scheme without RIS.

引用

页码：351 / 356

页数：6

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