1A Low-Complexity Algorithm for Throughput Maximization in Wireless Powered Communication Networks

This paper investigates a wireless powered communication network (WPCN) under the protocol of harvest-then-transmit, where a hybrid access point with constant power supply replenishes the passive user nodes by wireless power transfer in the downlink, then each user node transmit independent information to the hybrid AP in a time division multiple access (TDMA) scheme in the uplink. The sum-throughput maximization and min-throughput maximization problems are considered in this paper. The optimal time allocation for the sum-throughput maximization is proposed based on the Jensen’s inequality, which provides more insight into the design of WPCNs. A low-complexity fixed-point iteration algorithm for the min-throughput maximization problem, which promises a much better computation complexity than the state-of-the-art algorithm. Simulation results confirm the effectiveness of the proposed algorithm. Index Terms Energy harvesting, wireless power transfer, throughput maximization, time allocation