Outage Performance of Wireless-Powered SWIPT Networks with Non-linear EH Model in Nakagami-m Fading

Abstract

This paper investigates the outage probability and reliable throughput of a multi-user wireless powered simultaneous wireless information and power transfer (SWIPT) system. The multi-antenna power station (MPS) first transmits power to a single-antenna fog server (FS) and then, FS uses the harvested energy to broadcast the signals to multiple multi-antenna users (MUs). Power splitting receiver architecture is employed at each MU and the non-linear energy harvesting (EH) model is considered. For such a system, the closed-form expression of the outage probability is derived over Nakagami-m channel. Moreover, an asymptotic expression of the outage probability is presented for the high transmit power case. Based on this, the expression of the system reliable throughput is also analysed. Simulations demonstrate our presented theoretical results and show that the systems with the non-linear and the linear EH model have very different system performance behaviors. However, using the nonlinear EH model is able to avoid a fake system performance evaluation as it matches piratical EH circuits well compared with the linear one.