Optimal Resource Allocation in Full-Duplex Wireless-Powered Communication Network

TLDR

The paper investigates optimal resource allocation for a full‑duplex wireless‑powered communication network in which a hybrid access point simultaneously broadcasts energy to users and receives their uplink information. A joint optimization protocol is proposed that allocates time and transmit power for downlink energy transfer and uplink data transmission, with solutions for both perfect and imperfect self‑interference cancellation and a baseline half‑duplex scheme. Simulations demonstrate that the full‑duplex network outperforms the half‑duplex counterpart when effective self‑interference cancellation is achieved and stricter peak‑power limits are imposed on the access point.

Abstract

This paper studies optimal resource allocation in the wireless-powered communication network (WPCN), where one hybrid access point (H-AP) operating in full duplex (FD) broadcasts wireless energy to a set of distributed users in the downlink (DL) and, at the same time, receives independent information from the users via time-division multiple access in the uplink (UL). We design an efficient protocol to support simultaneous wireless energy transfer (WET) in the DL and wireless information transmission (WIT) in the UL for the proposed FD-WPCN. We jointly optimize the time allocations to the H-AP for DL WET and different users for UL WIT and the transmit power allocations over time at the H-AP to maximize the users' weighted sum rate of UL information transmission with harvested energy. We consider both the cases with perfect and imperfect self-interference cancellation (SIC) at the H-AP, for which we obtain optimal and suboptimal time and power allocation solutions, respectively. Furthermore, we consider the half-duplex (HD) WPCN as a baseline scheme and derive its optimal resource allocation solution. Simulation results show that the FD-WPCN outperforms the HD-WPCN when effective SIC can be implemented and more stringent peak power constraint is applied at the H-AP.