Secrecy Outage Performance with EH and TAS for Realistic Underlay Cognitive Radio Networks Using MIMO Systems

This work studies the physical layer security performance for Multiple Input Multiple Output (MIMO) secondary nodes. The proposed model is assumed to operate in underlay Cognitive Radio Network (CRN) that contains a primary node of a single antenna with the presence of an active eavesdropper. Furthermore, Transmit Antenna Selection (TAS) scheme is applied at the secondary transmitter side which also has a suitable battery to charge the energy collected from the Radio Frequency (RF) signals broadcasted from the primary transmitter to enhance collaboratively the power and spectral efficiencies. The security performance for the secondary system is achieved where the exact closed-form phrase is derived over Nakagami-m fading channels. The mathematical results show that the security performance can be improved by increasing the number of the antennas at the source and/or the destination or by decreasing the number of the antennas at the eavesdropper. The same target can be achieved by increasing the transmit power at the source, or improving the quality of the main channel. Greater harvested energy can be obtained at the secondary transmitter by selecting proper time slot that is dedicated for energy harvesting which further improved the security performance.