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<p>In this paper, we have investigated the outage probabilities (OPs) and the ergodic rates (ERs) of uplink reconfigurable intelligent surface (RIS)-assisted non-orthogonal and orthogonal multiple-access (NOMA and OMA) networks. Particularly, we have tackled a challenging scenario in which both user equipments (UEs) need assistance from the same RIS unit to communicate with the base station (BS). We have modeled all the UEs<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\rightarrow\)</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation>RIS and RIS<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\rightarrow\)</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation>BS links as Nakagami-<i>m</i> variates. To assess the performance of these networks, we have derived the necessary statistics for the effective channel gain of the reflected (UE<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\rightarrow\)</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation>RIS<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\rightarrow\)</EquationSource> <EquationSource Format="MATHML"><math> <mo stretchy="false">→</mo> </math></EquationSource> </InlineEquation>BS) link for the randomly phase-shifted UE, while adopting its already-existing counterpart statistics for the coherently phase-shifted one. On the basis of that, we have derived closed-form expressions for the OPs and the ERs for both RIS-assisted NOMA and OMA schemes. Finally, to get further insights on these results, we have elaborated on the high signal-to-noise ratio (SNR) regime.</p>

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Uplink RIS-assisted NOMA/OMA networks: a theoretical study

  • 期刊论文

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  • 发表日期：

    2026年1月13日

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  • Slimane Benmahmoud,
  • Abdelhalim Rabehi,
  • El-Hadi Meftah,
  • Abdelaziz Rabehi,
  • Xiaofan He,
  • Takele Ferede Agajie

摘要

In this paper, we have investigated the outage probabilities (OPs) and the ergodic rates (ERs) of uplink reconfigurable intelligent surface (RIS)-assisted non-orthogonal and orthogonal multiple-access (NOMA and OMA) networks. Particularly, we have tackled a challenging scenario in which both user equipments (UEs) need assistance from the same RIS unit to communicate with the base station (BS). We have modeled all the UEs \(\rightarrow\) → RIS and RIS \(\rightarrow\) → BS links as Nakagami-m variates. To assess the performance of these networks, we have derived the necessary statistics for the effective channel gain of the reflected (UE \(\rightarrow\) → RIS \(\rightarrow\) → BS) link for the randomly phase-shifted UE, while adopting its already-existing counterpart statistics for the coherently phase-shifted one. On the basis of that, we have derived closed-form expressions for the OPs and the ERs for both RIS-assisted NOMA and OMA schemes. Finally, to get further insights on these results, we have elaborated on the high signal-to-noise ratio (SNR) regime.