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The impact of imperfect channel state (CSI) information in an energyharvesting (EH) cooperative non-orthogonal multiple access (NOMA) network,consisting of a source, two users, and an EH relay is investigated in thispaper. The relay is not equipped with a fixed power source and acts as awireless powered node to help signal transmission to the users. Closed-formexpressions for the outage probability of both users are derived underimperfect CSI for two different power allocation strategies namely fixed anddynamic power allocation. Monte Carlo simulations are used to numericallyevaluate the effect of imperfect CSI. These results confirm the theoreticaloutage analysis and show that NOMA can outperform orthogonal multiple accesseven with imperfect CSI.

Wireless Powered Cooperative Relaying using NOMA with Imperfect CSI