Performance Analysis in Multi-Relay DF Cognitive Relay Networks under Nakagami–m fading channels

Abstract

In this paper, we started from the normal cellular communication system and studied a two-hop multi-relay DF cognitive relay network system. Under the interference from the primary user and an eavesdropper, which could wiretap the information while transferring messages, and all channels experiencing Nakagami-m fading with different parameters. Considering the existence of direct links, we employed the selection combing technique at the receive nodes. After deriving the secrecy outage probability, we compared the numerical results with simulations to verify the veracity of our theoretical results. Besides, we observed the variety of secrecy outage probability under different parameters and offered some advice about the design and optimization of cognitive relay network.