摘要：
Securing data transmission in future high-capacity high-coverage multi-tier hierarchical networks for which cognitive radio has emerged as an essential recipe, is of utmost importance. This paper investigates the secrecy outage performance of selection combining (SC) in cognitive radio networks (CRNs) over Rayleigh fading channels. We consider the cognitive wiretap system consisting of a single antenna transmitter (Alice) and a multiple antenna receiver (Bob) equipped with ( ) antennas in the presence of a passive eavesdropper (Eve) equipped with ( ) antennas. Compared to the work proposed by Maged Elkashlan et al. in [1], we present an alternative method to derive the closed-form expression for the secrecy outage probability (SOP) and develop a simplified SOP when the maximal transmit power at the secondary user is large enough. Our results reveal the impact of the primary network on the secondary network with a muti-antenna wiretap channel and simulations are conducted to validate the accuracy of our proposed analytical models.
