Partition-Based RIS-Assisted Multiple Access: NOMA Decoding Order Perspective

In this correspondence, we propose a closed-form resource allocation called partition-based multiple access (MA), which simultaneously utilizes both a reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) to reduce processing overhead and transmit power. The RIS can tune...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology Vol. 71; no. 8; pp. 9083 - 9088
Main Authors: Kim, Yonghwi, Kim, Jae-Hyun, Chae, Chan-Byoung
Format: Journal Article
Language:English
Published: New York IEEE 01.08.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Array signal processing
Closed form solutions
Complexity theory
Decoding
Exact solutions
Millimeter waves
Modal choice
multiple access
NOMA
non-orthogonal multiple access (NOMA)
Nonorthogonal multiple access
Power
Power management
Reconfigurable intelligent surface (RIS)
Relays
Resource allocation
Symbols
Tuning
ISSN:0018-9545, 1939-9359
Online Access:Get full text
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Summary:In this correspondence, we propose a closed-form resource allocation called partition-based multiple access (MA), which simultaneously utilizes both a reconfigurable intelligent surface (RIS) and non-orthogonal multiple access (NOMA) to reduce processing overhead and transmit power. The RIS can tune the mmWave signal and reduce the downlink transmit power, and NOMA achieves a relatively higher spectral efficiency than other MA methods. The integration of the RIS and NOMA, thus, can be a powerful solution. Previous studies have yet to obtain a closed-form solution for both the beam tuning settings and the decoding order in low complexity in the conventional RIS-NOMA. The proposed partition-based MA method, however, divides and arranges the array elements of the RIS to generate a fine beam for NOMA communications. We compare the transmit power reduction of the proposed method with the transmit power reduction of time-sharing and decode-and-forward relay. To confirm the feasibility of the integration, we also derive the criteria for MA mode selection.
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2022.3176017