Abstract
Non-orthogonal multiple access (NOMA) is envisioned as a promising technology that enhances the spectrum efficiency for future cellular networks. On the other hand, there is a growing interest in wireless powered sensor networks toward the sustainable realization of Internet of Things (IoT), as they may not require any battery replacement in principle. Moreover, the use of unmanned aerial vehicle (UAV) as a moving access point or base station has emerged as a potential solution to the high traffic demands of wireless networks. This article focuses on the UAV-aided data collection from multiple wireless powered sensor nodes, where a single-antenna UAV supplies all the sensor nodes located in the coverage area with energy for data transmission, with which the sensor nodes send back their information to the UAV. We study several transmission schemes including NOMA as well as cooperative relaying, together with two representative sensor node pairing strategies. Based on the theoretical analysis in terms of the achievable outage probabilities as well as the corresponding numerical results, we elucidate suitable node pairing strategies that depend on selected transmission schemes.
Highlights
I NTERNET of Things (IoT) is expected to play a vital role in the current and future wireless communication networks
We focus on a user pairing system associated with the wireless networks based on non-orthogonal multiple access (NOMA) or cooperative relaying, where the access devices are divided into two groups and a pair of devices is formed from each group
The primary issues that we address in this work are as follows: What is the best userpairing strategy for NOMA and cooperative relaying in our unmanned aerial vehicle (UAV)-enabled wireless powered sensor network (WPSN) model? Which performs better given a specific user pairing strategy? How should we allocate the resources between the energy transmission and information transmission? In response to these fundamental questions, our major contributions are summarized as follows:
Summary
I NTERNET of Things (IoT) is expected to play a vital role in the current and future wireless communication networks. We study the uplink of a UAV-enabled wireless network using power-domain NOMA as well as cooperative relaying, where the ground sensor nodes are wireless powered devices.. We study the uplink of a UAV-enabled wireless network using power-domain NOMA as well as cooperative relaying, where the ground sensor nodes are wireless powered devices.1 These devices experience air-to-ground (A2G) communication channels, which are characterized by altitude-dependent path loss exponent and fading. Antennas, one could enhance the performance through beamforming (see, e.g., [41]) In this case the UAV should acquire the channel state information (CSI) before energy transmission, which would make the initial process of power supply more complex for our system model. G-function Gpm,q,n a1,...,ap b1,...,bq z [42, Sec. 9.301]
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