Secured Selected Cooperative Communication Analysis in Cognitive Relay Networks

In this paper, we have considered an underlay cognitive relay network (CRN) with multiple relays and investigated its security performance in the presence of the eavesdropper. The secondary transmitter transmits information to the legitimate receiver directly as well as with the assistance of the best relay-node. Further, for the selection of the best relay-node, we propose a two-step method. The closed-form expression for the secrecy outage probability (SOP) is derived by using maximum ratio combining (MRC) technique at each legitimate/eavesdropper receiver. The simulation results are provided to validate the numerical analysis presented in this study.