Spectral and Energy‐Efficient Wireless‐Powered IoT Networks

The number of connected devices globally will skyrocket to 30 billion by 2025, giving rise to the well‐known Internet of Things (IoT). This chapter derives the optimal time allocation for the spectral efficiency (SE) maximization problem for time‐division multiple access (TDMA)‐based WPCN (T‐WPCN), based on which the corresponding problem for non‐orthogonal multiple access (NOMA)‐based WPCN (N‐WPCN) can be cast as the single user case for T‐WPCN. It proves that N‐WPCN in general requires a longer downlink (DL) wireless energy transfer (WET) time duration than T‐WPCN, which implies that N‐WPCN is more energy demanding. The chapter proves that N‐WPCN in general achieves a lower SE than T‐WPCN. It describes the adopted system model and problem formulation, and analyzes the performance of T‐WPCN and N‐WPCN.