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In this paper, we consider a relay-assisted uplink non-orthogonal multipleaccess (NOMA) system where two radio frequency (RF) users are grouped forsimultaneous transmission, over each resource block, to an intermediate relaywhich forwards the amplified version of the users' aggregated signals in thepresence of multiuser interference to a relatively far destination. In order tocope with the users' ever-increasing desire for higher data rates, ahigh-throughput free-space optics (FSO) link is employed as therelay-destination backhaul link. Dynamic-order decoding is employed at thedestination to determine the priority of the users based on their instantaneouschannel state information (CSI). Closed-form expressions for the individual-and sum-rate outage probability formulas are derived in the case of independentRayleigh fading for the users-relay access links when the FSO backhaul link issubject to Gamma-Gamma turbulence with pointing error. This work can beregarded as an initial attempt to incorporate power-domain NOMA overultra-high-speed FSO-backhauled systems, known as mixed RF-FSO systems.

Outage Probability Analysis of Uplink NOMA over Ultra-High-Speed FSO-Backhauled Systems