Outage Performance and QoS Optimization in Full-Duplex System With Non-Linear Energy Harvesting Model

In order to overcome the problem that the traditional linear energy harvesting (EH) model is not practical, this paper presents a practical nonlinear EH model, which considers the sensitivity and saturation characteristics of the circuit. Furthermore, for purpose of solving the problem of spectrum requirement and energy consumption of wireless relays, the proposed model in this paper is used for studying the full-duplex (FD) decode-and-forward relay system. The expression of the outage probability of the system is deduced and the outage throughput of the system is calculated. According to different system quality of service (QoS) requirements, this paper further discusses the optimal scheme of non-linear EH based on outage performance and gives the closed expression of the optimal solution to minimize the outage probability of the FD system. And the optimal solution to maximize the outage throughput of the system is obtained based on the golden section method. The simulation results verify the correctness of the theoretical work, and the simulation results also show that the performance of the FD system under the proposed model is quite different from that of the traditional linear model.