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<p>The present paper studies the performance of an intelligent reflecting surface (IRS) assisted secure non-orthogonal multiple-access (NOMA) system in which a base station serves two legitimate users under the presence of a malicious eavesdropper. Considering the general model by taking both direct and reflecting links of Nakagami-<i>m</i> fading into account, we aim at deriving the exact and asymptotic analytical expressions of secrecy outage probability (SOP) and average secrecy capacity (ASC). To obtain more insights into the system performance, the diversity orders of SOPs and slopes of ASCs in the high signal-to-noise ratio regime are found. Monte Carlo simulations are conducted to verify the derived analytical performance expressions. The simulation results also reveal useful insights into the secrecy performance of the IRS-aided NOMA systems in comparison with NOMA systems without the IRS or IRS-aided orthogonal multiple access systems. Finally, we investigate the impacts of the number of reflecting elements and the position of the IRS on the system secure performance.</p>

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Secrecy performance analysis of IRS-aided secure NOMA systems over Nakagami-m fading channels

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Tu-Trinh Thi Nguyen,
  • Ha Hoang Kha,
  • Xuan-Xinh Nguyen

摘要

The present paper studies the performance of an intelligent reflecting surface (IRS) assisted secure non-orthogonal multiple-access (NOMA) system in which a base station serves two legitimate users under the presence of a malicious eavesdropper. Considering the general model by taking both direct and reflecting links of Nakagami-m fading into account, we aim at deriving the exact and asymptotic analytical expressions of secrecy outage probability (SOP) and average secrecy capacity (ASC). To obtain more insights into the system performance, the diversity orders of SOPs and slopes of ASCs in the high signal-to-noise ratio regime are found. Monte Carlo simulations are conducted to verify the derived analytical performance expressions. The simulation results also reveal useful insights into the secrecy performance of the IRS-aided NOMA systems in comparison with NOMA systems without the IRS or IRS-aided orthogonal multiple access systems. Finally, we investigate the impacts of the number of reflecting elements and the position of the IRS on the system secure performance.