Outage probability analysis of cognitive decode-and-forward relay networks over k ? ? Shadowed Channels

A primary and cognitive relay spectrum sharing network is considered. The channels are assumed to be κ - μ shadowed fading with arbitrary fading parameters. We obtained expression for outage probability to analyze the performance under the power constraints on maximum transmit power at secondary user (SU) transmitter and relay, and peak interference power at primary user (PU) receiver. The performance of the cognitive relay network is analyzed for various fading parameters and power constraints, which are validated by Monte-Carlo simulations. It is shown that an outage floor is reached when peak interference power at PU receiver is independent of transmitting power at SU transmitter and relay, which gives insight to design a cognitive relay network in the presence of PU network.