Secrecy Outage of a Simultaneous Wireless Information and Power Transfer Cognitive Radio System

In this letter, a cognitive radio-based simultaneous wireless information and power transfer system consisting of one base station, one desired information receiver, multiple primary users, and multiple energy harvesting receivers is considered. Each link in the system suffers from small scale fading and path loss. We focus on the secrecy outage in this network, keeping in mind that the multiple energy harvesting receivers may act as potential eavesdroppers. A closed-form analytical expression for the exact secrecy outage probability is derived, and some useful insights are obtained. Numerical and Monte Carlo simulation results are presented to validate our analysis.