ARIS aided two-way NOMA communication networks

This paper presents a comprehensive performance analysis of an active reconfigurable intelligent surface (ARIS)-assisted two-way non-orthogonal multiple access (TW-NOMA) network, taking into account the effects of hardware-induced self-interference (HIS), imperfect successive interference cancellation (ipSIC) and additive noise. Specifically, a generalized system model is established under Nakagami-m fading channels, where both the ARIS hardware impairments and residual interference from ipSIC are jointly considered. We derive new closed-form and asymptotic expressions for the outage probability of near and far users under both perfect successive interference cancellation and ipSIC conditions, and further analyze the diversity order to quantify system reliability. Additionally, the delay-constrained system throughput is investigated to evaluate the practical data transmission capabilities of the proposed network. Extensive Monte Carlo simulations are performed to verify the accuracy of the analytical results and to assess the impact of key system parameters, such as the reflection amplification factor, fading severity, and number of ARIS elements. The simulation results demonstrate that the ARIS-TW-NOMA-HIS network achieves substantial performance gains over passive RIS and orthogonal multiple access counterparts, especially in high signal-to-noise ratio regimes and with a larger number of reflecting elements.