Reconfigurable Intelligent Surface Assisted Coordinated Multipoint in Downlink NOMA Networks

Mohamed Kadry Elhattab, Mohamed Amine Arfaoui, Chadi Assi*, Ali Ghrayeb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

In this letter, we investigate the amalgamation between the reconfigurable intelligent surface (RIS) technology and the joint transmission coordinated multipoint (JT-CoMP) in order to enhance the performance of a cell-edge user equipment (UE) in a two-user non-orthogonal multiple access (NOMA) group without deteriorating the performance of the NOMA cell-center UE. The RIS is adopted to construct a strong combined channel gain at the cell-edge UE, while JT-CoMP is used to mitigate the effects of inter-cell interference (ICI). In this proposed framework, we derive first a closed-form expression for the ergodic rate of the cell-edge UE, and then we evaluate the network spectral efficiency. We validate the derived expression through Monte-Carlo simulations, where we demonstrate the efficacy of the proposed framework compared to other multiple access techniques proposed in the literature.

Original languageEnglish
Article number9217565
Pages (from-to)632-636
Number of pages5
JournalIEEE Communications Letters
Volume25
Issue number2
DOIs
Publication statusPublished - Feb 2021
Externally publishedYes

Keywords

  • 6G
  • CoMP
  • NOMA
  • RIS
  • spectral efficiency

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