Throughput Maximization in Full-Duplex Dual-Hop Wireless Powered Communication Networks

In this paper, we consider a dual-hop wireless powered communication network (DH-WPCN) with a full duplex (FD) hybrid access point (HAP), which can transmit energy to the energy-constrained relays and receive information from the users assisted by the relays simultaneously. Under the setting, we propose an efficient relaying scheme, following which a relay can always harvest energy from the HAP only except the time slot that it forwards the user's information to the HAP. After that, we investigate the system throughout maximization problems for both cases that the relays adopt the amplify-and-forward (AF) mode and the decode-and-forward (DF) mode. To obtain the optimal time allocation between the downlink energy transfer from HAP to relays and the uplink information transmission from users to HAP, we then propose a low-complexity algorithm to solve the formulated problems. Moreover, we prove that the DF mode leads to a higher system throughput than the AF mode theoretically. Simulation results demonstrate the superiority of the proposed scheme compared with the benchmark schemes.