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Energy harvesting (EH) cognitive relays are an exciting solution to theproblem of inefficient use of spectrum while achieving green communications andspatial diversity. In a spectrum sharing scenario, we investigate theperformance of a cognitive relay network, where a secondary source communicateswith its destination over Nakagami-$m$ channels via decode-and-forward EHrelays while maintaining the outage probability of the primary user below apredefined threshold. Specifically, we derive a closed-form expression for thesecondary outage probability and show that it is a function of the probabilityof an EH relay having sufficient energy for relaying, which in turn, depends onthe energy harvesting and consumption rates of the EH relay and the primaryoutage probability threshold. We also show that relaxing the primary outageconstraint may not always benefit the cognitive EH relay network due to thelimitations imposed on the relay's transmit power by the energy constraint.

Outage Analysis of Spectrum Sharing Energy Harvesting Cognitive Relays in Nakagami-$m$ Channels