Secrecy Outage Analysis for Secure DF Cooperative Networks Based Relay Selection Scheme with Non-linear Energy Harvester

In this paper, the secrecy outage probability (SOP) for the proposed secure decode-and-forward (DF) cooperative networks with non-linear energy harvester is investigated. The energy-constrained relays are considered and the harvested energy is described using a practical non-linear energy harvesting model, whose non-linear property is depicted by a piecewise linear model. On the premise of the harvested power satisfying its own consumption, the optimal dynamic power splitting (PS) factor is designed to maximize the power of the transmitted signal at relays. Then the relay that can maximize the secrecy capacity is selected to convey the information through relay selection scheme. The analytical results of the SOP for the proposed network with practice non-linear energy harvester are derived. The numerical results verify the theoretical analysis and show the superior performance compared to other counterparts under the different parameters.