Sum Rate Maximization for Active RIS-Aided Uplink Multi-Antenna NOMA Systems

Both reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) are treated as promising technologies for future wireless communications. However, the performance gain achieved by the traditional passive RIS-aided NOMA system is limited due to the double-fading effect for the...

Full description

Saved in:
Bibliographic Details
Published in:IEEE wireless communications letters 2023-07, Vol.12 (7), p.1-1
Main Authors: Yang, Xiaolong, Wang, Hong, Feng, Youhong
Format: Article
Language:English
Subjects:
Active reconfigurable intelligent surface
alternating optimization
Antennas
Array signal processing
Beamforming
Equalizers
Maximization
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
Optimization
Resource management
sum rate
Uplink
Uplinking
Wireless communication
Wireless communications
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Both reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) are treated as promising technologies for future wireless communications. However, the performance gain achieved by the traditional passive RIS-aided NOMA system is limited due to the double-fading effect for the base station (BS)-RIS-user channel. In this letter, a sum rate maximization problem for active RIS-aided uplink multi-antenna NOMA system is studied, in which the reflecting elements (REs) of active RIS can manipulate the phase shifts and amplify the amplitudes of incident signals. To tackle the formulated sum rate maximization problem, the original optimization problem is decomposed into three subproblems, i.e., the equalizer optimization, the power allocation, and the active RIS beamforming design. Simulation results show that the proposed active RIS-aided NOMA system can effectively improve sum rate compared with several benchmark schemes.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2023.3264516