On the performance of active RIS-enhanced NOMA systems with spectrum sharing mechanisms
Minh Tran, Minh Bui Vu, Sang Quang Nguyen
TL;DR
This paper analyzes how active reconfigurable intelligent surfaces improve performance in shared-spectrum NOMA networks, showing better reliability and efficiency than traditional methods.
Contribution
Proposes an ARIS-assisted NOMA architecture and derives performance metrics validated by simulations and optimization.
Findings
ARIS outperforms PRIS and OMA in outage probability, throughput, energy consumption, and efficiency.
Closed-form expressions for key performance metrics are derived and validated with simulations.
Optimized power allocation minimizes outage probability in ARIS-assisted NOMA systems.
Abstract
This paper presents a comprehensive performance analysis of a downlink non-orthogonal multiple access (NOMA) network assisted by an active reconfigurable intelligent surface (ARIS) in a cognitive spectrum-sharing scenario. Unlike conventional passive RIS (PRIS), the ARIS can both adjust phase shifts and amplify incident signals, thereby mitigating inter-user interference and overcoming multiplicative fading. We consider a two-user secondary network coexisting with a primary user, where the base station communicates with the secondary users via the ARIS. Closed-form expressions for the outage probability (OP), throughput, energy efficiency (EE), and an approximation for the ergodic data rate (EDR) are derived under Nakagami-m fading, along with asymptotic OP analysis to reveal the achievable diversity order. We also formulate and solve an optimization problem for the NOMA power…
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Taxonomy
TopicsAdvanced Wireless Communication Technologies · PAPR reduction in OFDM · IoT Networks and Protocols