Downlink and Uplink Intelligent Reflecting Surface Aided Networks: NOMA and OMA

Abstract

Intelligent reflecting surfaces (IRSs) are envisioned to provide reconfigurable wireless environments for future communication networks. In this paper, both downlink and uplink IRS-aided non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA) networks are studied, in which an IRS is deployed to enhance the coverage by assisting a cell-edge user device (UD) to communicate with the base station (BS). To characterize system performance, new channel statistics of the BS-IRS-UD link with Nakagami-$m$ fading are investigated. For each scenario, the closed-form expressions for the outage probability and ergodic rate are derived. To gain further insight, the diversity order and high signal-to-noise ratio (SNR) slope for each scenario are obtained according to asymptotic approximations in the high-SNR regime. It is demonstrated that the diversity order is affected by the number of IRS reflecting elements and Nakagami fading parameters, but the high-SNR slope is not related to these parameters. Simulation results validate our analysis and reveal the superiority of the IRS over the full-duplex decode-and-forward relay.

arXiv commentAccepted for publication in the IEEE Transactions on Wireless Communications

References in corpus (6)

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Cited by in corpus (6)

• Non-Orthogonal Multiple Access (NOMA) With Multiple Intelligent Reflecting Surfaces
• Secrecy Outage Probability Analysis for Downlink RIS-NOMA Networks with On-Off Control
• Secure Communication of Active RIS Assisted NOMA Networks
• Outage and Finite-SNR DMT Analysis for IRS-aided MIMO Systems: How Large IRSs Need to Be?
• Secrecy Performance Analysis of RIS Assisted Ambient Backscatter Communication Networks
• Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface Assisted NOMA Networks