Title: On the Performance of Wireless Powered Communication With Non-linear Energy Harvesting,
Abstract: In this paper, we analyze the performance of a time-slotted multi-antenna
wireless powered communication (WPC) system, where a wireless device first
harvests radio frequency (RF) energy from a power station (PS) in the downlink
to facilitate information transfer to an information receiving station (IRS) in
the uplink. The main goal of this paper is to provide insights and guidelines
for the design of practical WPC systems. To this end, we adopt a recently
proposed parametric non-linear RF energy harvesting (EH) model, which has been
shown to accurately model the end-to-end non-linearity of practical RF EH
circuits. In order to enhance the RF power transfer efficiency, maximum ratio
transmission is adopted at the PS to focus the energy signals on the wireless
device. Furthermore, at the IRS, maximum ratio combining is used. We analyze
the outage probability and the average throughput of information transfer,
assuming Nakagami-$m$ fading uplink and downlink channels. Moreover, we study
the system performance as a function of the number of PS transmit antennas, the
number of IRS receive antennas, the transmit power of the PS, the fading
severity, the transmission rate of the wireless device, and the EH time
duration. In addition, we obtain a fixed point equation for the optimal
transmission rate and the optimal EH time duration that maximize the asymptotic
throughput for high PS transmit powers. All analytical results are corroborated
by simulations.