Performance Analysis of the STAR-RIS-Assisted Downlink NOMA Communication System with MRC

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We discuss a simultaneously transmitting and reflecting-reconfigurable intelligent surface (STAR-RIS)-assisted downlink non-orthogonal multiple access (NOMA) communication system. STAR-RIS employs the energy splitting protocol for transmitting and reflecting the incident signals to users located on different sides of the surface. To study the impact of multiple antennas on the system performance, we perform maximum ratio combining (MRC) at NOMA users and beamforming towards STAR-RIS at the base station (BS). We model the distribution of cascaded Rician fading channels for the proposed system. Closed-form expressions of outage probability, asymptotic outage probability, and system throughput are derived. All theoretically derived results are verified via Monte Carlo simulation.

Original languageEnglish
Pages (from-to)1739-1743
Number of pages5
JournalIEEE Communications Letters
Issue number7
Early online date5 May 2023
Publication statusPublished - 1 Jul 2023
MoE publication typeA1 Journal article-refereed


  • beamforming
  • Interference
  • Maximum ratio combining
  • NOMA
  • non-orthogonal multiple acces
  • outage probability
  • Power system reliability
  • Probability
  • reconfigurable intelligent surface
  • Rician channels
  • Signal to noise ratio
  • Symbols
  • system throughput


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