On Outage Probability of Cooperative Cognitive Radio Networks Over k-μ Shadowed Fading

In this paper, we study the outage probability of a multiple relay cooperative cognitive radio network over kappa-mu shadowed fading channels where the relays use the decode and-forward (DF) protocol. The probability density function and cumulative distribution function of the total signal-to-noise ratio at the secondary receiver is derived for the case of selection combining. In particular, approximating the channels by Nakagami-m fading results in an analytical expression for the outage probability that can be expressed in terms of well- known functions. This approximation provides a good match when the parameters of the kappa-mu shadowed fading channels translate to integer values of fading severity parameter m. Numerical results are provided to illustrate the impact of system parameters on the outage probability for kappa-mu shadowed fading channels.