Anotace:
This paper investigates the physical-layer secure performance of a multi-power beacon-empowered wirelessly powered communication system in the surveillance of an external eavesdropper. Specifically, a limited-energy source harvests energy from multiple dedicated power beacons in the first time slot and reuses it to perform data transmission in the second time slot. However, its communication with the destination is wiretapped by a potentially idle untrusted user. Thus, to evaluate the secure performance of the considered system, we have derived closed-form expressions for the secrecy outage probability (SOP) metric in terms of both exact and asymptotic aspects. Through these formulas, we then provide a series of numerical discussions on how to configure the number setting of the power beacon, the energy harvesting parameters as well as scheduling time to improve the SOP performance, where the Monte-Carlo simulation method is used to verify the developed mathematical framework.