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Non-orthogonal-multiple-access (NOMA) and reconfigurable intelligent surface (RIS) are two keys technologies. The use of amplify-and-forward (AF) and RIS in NOMA system can perform better the system in terms of sum-rates. In this paper, we study two-way NOMA-AF system with reconfigurable intelligent surface (TW-NOMA-AF system with RIS). We assume that uplink and downlink communication channels in NOMA system between two users and the base station (BS) via RIS and AF node can be reciprocal. We first obtain the optimal phase at RIS. We then derive the ergodic capacity in closed-form. We aim to analyse the impact of relay power, the integration of RIS, RIS re-flexion matrix and channel characteristics. Numerical results show the accuracy of our suggested mathematical analysis.

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Reconfigurable Intelligent Surfaces in Two-Way NOMA-AF Relaying Networks

  • 会议论文

  • 发表日期：

    2025年

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  • Rania Jadlaoui,
  • Wided Hadj Alouane,
  • Hatem Boujemaa

摘要

Non-orthogonal-multiple-access (NOMA) and reconfigurable intelligent surface (RIS) are two keys technologies. The use of amplify-and-forward (AF) and RIS in NOMA system can perform better the system in terms of sum-rates. In this paper, we study two-way NOMA-AF system with reconfigurable intelligent surface (TW-NOMA-AF system with RIS). We assume that uplink and downlink communication channels in NOMA system between two users and the base station (BS) via RIS and AF node can be reciprocal. We first obtain the optimal phase at RIS. We then derive the ergodic capacity in closed-form. We aim to analyse the impact of relay power, the integration of RIS, RIS re-flexion matrix and channel characteristics. Numerical results show the accuracy of our suggested mathematical analysis.