Wireless powered communication networks (WPCNs), where multiple energy-limited
devices first harvest energy in the downlink and then transmit information in the uplink, have
been envisioned as a promising solution for the future Internet-of-Things (IoT). Meanwhile,
nonorthogonal multiple access (NOMA) has been proposed to improve the system spectral
efficiency (SE) of the fifth-generation (5G) networks by allowing concurrent transmissions of
multiple users in the same spectrum. As such, NOMA has been recently considered for the …

The number of connected devices globally will skyrocket to 30 billion by 2025, giving rise to
the well-known Internet of Things (IoT)[1]. With such a huge number of IoT devices, the
lifetime of networks becomes a critical issue and conventional battery-based solutions may
no longer be sustainable due to the high cost of battery replacement as well as
environmental concerns. As a result, wireless power transfer, which enables energy
harvesting from ambient radio frequency (RF) signals, is envisioned as a promising solution …