Throughput maximization for wireless powered communication

In this paper, we consider a wireless communication pair powered with radio frequency (RF) signal, in which the transmitter first harvest energy from an energy access point and then transmit information to the destination. Optimization problems aiming at maximizing throughput are investigated with a consideration of two types of power constraints at the transmitter: i) short-term power constraint, which corresponds to the case that no battery capacity is assumed at the transmitter and ii) long-term power constraint, which corresponds to the case that battery capacity at the transmitter is large enough. The formulated optimization problems are non-convex but are transformed to be convex ones in the first step. For the optimization problem with short-term power constraint, a fast algorithm with a combination of bisection search and closed-form solution is proposed for the first time. For the optimization problem with long-term power constraint, an online calculation method is designed for the first time. Numerical results prove the effectiveness of the proposed algorithms.