Secure Resource Allocation for Polarization-Based Non-Linear Energy Harvesting Over 5G Cooperative CRNs

We address secure resource allocation for energy harvesting (EH) based 5G cooperative cognitive radio networks (CRNs). To improve spectrum efficiency and the physical layer security, the size-limited secondary users (SUs) are equipped with orthogonally dual-polarized antennas (ODPAs). In particular, we propose, develop, and analyze an efficient resource allocation scheme under a realistic and non-linear EH model, which can capture the non-linear characteristics of the end-to-end wireless power transfer (WPT) for radio frequency based EH circuits. Our obtained numerical results validate that a substantial performance gain can be obtained by employing the non-linear EH model and equipping SUs with ODPAs.