Secrecy performance of threshold-based cognitive relay network with diversity combining.

In the spectrum sharing mode, the transmitting power of the secondary user (SU) is optimally controlled, such that no additional interference occurs at the primary user (PU). In this paper, the secrecy outage performance is analyzed for such cognitive underlay decode-and-forward (DF) threshold-based relay network. The relayed and the direct signals are combined at the secondary eavesdropper and de...