Resource Allocation in OFDM-based Wireless Powered Communication Networks with SWIPT

This paper considers a multiuser orthogonal frequency division multiplexing (OFDM)-based wireless powered communication networks (WPCNs) with simultaneous wireless information and power transfer (SWIPT). In particular, both uplink and downlink communications are considered by dividing the time for transmission into downlink and uplink communication phases. In the downlink, SWIPT is adopted at the users with nonlinear energy harvesting model, and in the uplink, users use the harvested energy to perform uplink data transmission. We propose a suboptimal resource allocation scheme to maximize the weighted downlink and uplink sum rate by optimizing the time, subcarrier and power allocation. It is shown that the proposed scheme can well balance between the downlink rate and the uplink rate.