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

Yonghwi Kim, Jae Hyun Kim, Chan Byoung Chae

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)9083-9088
Number of pages6
JournalIEEE Transactions on Vehicular Technology
Volume71
Issue number8
DOIs
Publication statusPublished - 2022 Aug 1

Bibliographical note

Publisher Copyright:
© 1967-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Automotive Engineering

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