Abstract
In this paper, we consider a wireless power transfer assisted uplink non-orthogonal multiple access (WPT-NOMA) network in Internet of things (IoT), where the battery-less IoT devices harvest the energy from the dedicated access point, based on linear and non-linear energy harvesting (EH) models. Furthermore, a novel hybrid successive interference cancellation (SIC) scheme is proposed so that the non-energy constrained IoT device can adaptively adjust the transmit power according to its channel fading gain. For the non-linear EH model, closed-form expressions of outage performance are derived, with the observation of the error outage floor at high signal-to-noise ratio (SNR) region, and the asymptotic behavior of the error floor is derived by using the extreme value theory through increasing the number of IoT devices. For the linear EH model, the proposed hybrid SIC scheme can guarantee the uplink WPT-NOMA networks achieve full diversity gain for any target data rate of IoT devices. Simulation and analytical results verify that the proposed hybrid SIC scheme can overcome the existing works of the hybrid SIC scheme, where the error outage floor appears if the data rate of IoT devices is higher than a threshold value.