Performance analysis of uplink cognitive cellular networks in Nakagami-m fading channels

In this paper, we investigate the ergodic capacity and the average symbol error probability (SEP) of uplink cognitive cellular networks with opportunistic scheduling in Nakagami-m fading channels. Considering the same opportunistic scheduling scheme as [1], we derive closed-form expressions for the ergodic capacity and the average SEP of the system. Depending on closed-form expressions, we further investigate the impact of various key system parameters, i.e., channel fading severity, primary user´s target outage probability and primary user´s transmission rate, on cognitive user´s performance. Theoretical results, verified by simulations, about the ergodic capacity and the average SEP are expressed in terms of the Meijer´s G-function and the confluent hypergeometric function of the second kind, respectively. From the simulations, we get that the ergodic capacity and the average SEP are independent of the number of cognitive users and the transmit power of primary user.