Full-duplex wireless-powered communication with antenna pair selection

In this paper, we study a full-duplex wireless-powered communication network (FD-WPCN), which consists of one full-duplex (FD) hybrid access-point (H-AP) and one FD user. The H-AP and user are both equipped with two antennas, one for downlink wireless energy transfer (WET) from the H-AP to user and the other for uplink wireless information transfer (WIT) from the user to H-AP, where WET and WIT are performed simultaneously through the same frequency band. We consider the scenario that the role of each antenna (i.e., transmission or reception) is not predefined and propose an antenna pair selection (APS) scheme to improve the performance by optimally configuring the transmit and receive antennas at each node. The closed-form expressions for outage probability and probability density function (PDF) of the received signal-to-noise ratio (SNR) at the H-AP are derived. Based on the PDF, we then calculate the closed-form expressions of ergodic capacity, SNR moments and symbol error rate (SER). Finally, we verify the analytical results through Monte Carlo simulations.