Secrecy Performance Analysis of Multi-Functional RIS-Assisted NOMA Networks
<|reference_start|>Secrecy Performance Analysis of Multi-Functional RIS-Assisted NOMA Networks: Although reconfigurable intelligent surface (RIS) can improve the secrecy communication performance of wireless users, it still faces challenges such as limited coverage and double-fading effect. To address these issues, in this paper, we utilize a novel multi-functional RIS (MF-RIS) to enhance the secrecy performance of wireless users, and investigate the physical layer secrecy problem in non-orthogonal multiple access (NOMA) networks. Specifically, we derive closed-form expressions for the secrecy outage probability (SOP) and secrecy throughput of users in the MF-RIS-assisted NOMA networks with external and internal eavesdroppers. The asymptotic expressions for SOP and secrecy diversity order are also analyzed under high signal-to-noise ratio (SNR) conditions. Additionally, we examine the impact of receiver hardware limitations and error transmission-induced imperfect successive interference cancellation (SIC) on the secrecy performance. Numerical results indicate that: i) under the same power budget, the secrecy performance achieved by MF-RIS significantly outperforms active RIS and simultaneously transmitting and reflecting RIS; ii) with increasing power budget, residual interference caused by imperfect SIC surpasses thermal noise as the primary factor affecting secrecy capacity; and iii) deploying additional elements at the MF-RIS brings significant secrecy enhancements for the external eavesdropping scenario, in contrast to the internal eavesdropping case.<|reference_end|>
@article{pei2024secrecy,
    title={Secrecy Performance Analysis of Multi-Functional RIS-Assisted NOMA
  Networks},
    author={Yingjie Pei, Wanli Ni, Jin Xu, Xinwei Yue, Xiaofeng Tao, Dusit Niyato},
    journal={arXiv preprint arXiv:2405.10514},
    year={2024},
    archivePrefix={arXiv},
    eprint={2405.10514},
    primaryClass={cs.IT eess.SP math.IT}
}