Anotace:
In this paper, we addressed improving the physical layer security (PLS) of an energy harvesting (EH)-based wireless network composed of a source node, which is operated by the harvested energy from the power beacon and sends secure information to a destination in the presence of an eavesdropper and a cooperative jammer (CJ). In particular, we provided an explicit transmit design for minimizing the secrecy outage probability (SOP), subject to a minimum secrecy rate constraint. The results show that support from a friendly jammer can significantly improve the reliability and security performance of the system. Additionally, we described the effects of particular factors on the optimal possible temporal distribution between information transmission and energy harvesting. As a result, when considering the SOP, we concluded that there exists an optimal value of the time switching factor for the system to function well. The analytical formulas were verified by Monte Carlo simulation.