Abstract
Cognitive relay networks employ cooperative relaying scheme in the cognitive secondary user transmission. In this letter, we theoretically derive a closed form expression and a lower bound of the outage performance for underlay cognitive relay networks considering the interference from the primary transmitter to the secondary receiver, the interference from the secondary transmitter to the primary receiver and the dependence introduced due to the interference power constraint. It is shown from simulation results that the derived closed form expression matches the simulated results.
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