Optimal Resource Allocation for Full-Duplex Wireless-Powered Relaying with Self-Energy Recycling

In this paper, we consider a self-energy recycling (SER) based decode-and-forward full-duplex (FD) wireless-powered relaying network, where an energy-constrained relay node can assist the source node to transmit information to the destination node. Different from existing work that employs the FD scheme with self-interference (SI) suppression, a joint time and power allocation (JoTPA) scheme is studied to minimize the outage probability by using the SER relay, which can utilize both the source signal and the SI signal to harvest energy. In particular, the outage probability of the proposed scheme is investigated with the statistical and instantaneous channel state information, respectively. For the static JoTPA, an approximate expression of outage probability is obtained to determine the optimal static time allocation (TA) and power allocation (PA) ratios. Moreover, we propose a two-step search algorithm with the dynamic JoTPA to derive the optimal dynamic TA and PA ratios for minimizing the outage probability. Finally, numerical results are provided to validate the superiority of our proposed scheme over the SI suppression scheme.