  This article investigates a non-orthogonal multiple access (NOMA) enhanced
Internet of Things (IoT) network. In order to provide connectivity, a novel
cluster strategy is proposed, where multiple devices can be served
simultaneously. Two potential scenarios are investigated: 1) NOMA enhanced
terrestrial IoT networks and 2) NOMA enhanced aerial IoT networks. We utilize
stochastic geometry tools to model the spatial randomness of both terrestrial
and aerial devices. New channel statistics are derived for both terrestrial and
aerial devices. The exact and the asymptotic expressions in terms of coverage
probability are derived. In order to obtain further engineering insights,
short-packet communication scenarios are investigated. From our analysis, we
show that the performance of NOMA enhanced IoT networks is capable of
outperforming OMA enhanced IoT networks. Moreover, based on simulation results,
there exists an optimal value of the transmit power that maximizes the coverage
probability.
