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The use of cognitive relays is an emerging and promising solution to overcomethe problem of spectrum underutilization while achieving the spatial diversity.In this paper, we perform an outage analysis of the secondary system withamplify-and-forward relays in a spectrum sharing scenario, where a secondarytransmitter communicates with a secondary destination over a direct link aswell as the best relay. Specifically, under the peak power constraint, wederive a closed-form expression of the secondary outage probability providedthat the primary outage probability remains below a predefined value. We alsotake into account the effect of primary interference on the secondary outageperformance. Finally, we validate the analysis by simulation results.

Secondary Outage Analysis of Amplify-and-Forward Cognitive Relays with Direct Link and Primary Interference