Wireless Powered Massive Access for Cellular Internet of Things With Imperfect SIC and Nonlinear EH

In this paper, we investigate the issue of simultaneous wireless information and power transfer in the cellular Internet of Things (IoT) with a massive number of different access devices, e.g., information decoding devices, energy harvesting (EH) devices, and hybrid devices. Especially, we consider a practical scenario of the cellular IoT, where the IoT devices have a nonlinear EH receiver and perform imperfect successive interference cancellation (SIC) due to a limited capability. The benefits offered by a multiple-antenna base station are exploited to enhance the efficiency of both information transmission and power transfer. In particular, we propose to jointly optimize the spatial beam, transmit power, and power splitting ratio to alleviate the impacts of both nonlinear EH and imperfect SIC. To this end, two effective algorithms are designed from the perspectives of maximizing the weighted sum rate and minimizing the total power consumption, respectively. Finally, extensive simulation results are presented to validate the effectiveness of the proposed algorithms.