Abstract:
Internet-of-Things (IoT) technology has received much attention due to its great potential to
interconnect billions of devices in a broad range of applications. IoT networks can provide high-quality
services for a large number of users and smart objects. On the other hand, massive connectivity in IoT
networks brings problems associated with spectral congestion. This issue can be solved by applying cognitive
radio (CR) and non-orthogonal multiple access (NOMA) techniques. In this respect, this paper studies the
performance of cooperative CR-NOMA enabled IoT networks over a generalized α − µ fading channel
model. Closed-form analytical expressions of the end-to-end outage probability (OP) for the secondary
NOMA users are derived using the Meijer’s G-function with a consideration of the impacts of the interference
temperature constraint, primary interference, residual hardware impairments and imperfect successive
interference cancellation. Moreover, to acquire some useful insights on the system performance, asymptotic
closed-form OP expressions are provided. Additionally, the impact of α and µ fading parameters on the
outage performance is examined and, as a result, it is concluded that the system performance sufficiently
improves as α and/or µ increase. Furthermore, the outage performance of the proposed system model is
shown to outperform that of an identical IoT network operating on orthogonal multiple access. Finally,
the provided closed-form OP expressions are validated with Monte Carlo simulations.
