The conflation of cognitive radio (CR) and non-orthogonal multiple access (NOMA) concepts
is a promising approach to fulfill the massive connectivity goals of future networks given the …

In this paper, we tackle the problem of optimizing user clustering, power, and resource (time
slot or bandwidth) allocation in the downlink of a hybrid non-orthogonal multiple access …

Resources in cognitive radio networks (CRNs) should dynamically be allocated according to
the sensed radio environment. Although some work has been done for dynamic resource …

This letter studies the problem of maximizing the spectral efficiency for multi-radio access
(MRA) with a limited transmission power constraint in cognitive heterogeneous networks …

To support the surge in wireless data traffic, the spectrum and energy efficiencies of cellular
networks should be largely increased. Heterogeneous two-tier architecture has been …

In this letter, a decode-and-forward cooperative underlay cognitive radio (CR) non-
orthogonal multiple access (NOMA) network is studied. Exact closed-form expressions for …

As an effective approach to alleviate the spectrum scarcity problem, cognitive radio (CR) has
recently attracted an increasing amount of attention. In this paper, an optimization algorithm …

Recently, the increasing demand of radio spectrum for the next generation communication
systems due to the explosive growth of applications appetite for band-widths has led to the …

Small cell (SC) base stations with cognitive capabilities are seen as an efficient way to cope
with interference between the SC base stations and macrocell base stations (MBSs) …

Non-orthogonal multiple access has attracted much recent attention due to its capability of
improving the system spectral efficiency in wireless communications. Deploying NOMA in a …