To improve the radio spectral efficiency for 5G and beyond, novel radio access techniques
need to be designed to accommodate unprecedented number of connected devices, and …

The Internet of Things (IoT) has attracted significant attentions in the fifth generation mobile
networks and the smart cities. However, considering the large numbers of connectivity …

In this paper, we propose a novel robust resource allocation algorithm for downlink non-
orthogonal multiple access (NOMA) cognitive radio networks with the underlay spectrum …

Non-orthogonal multiple access (NOMA)-based cognitive wireless networks can improve the
spectral efficiency to utilize the vacant spectrum resource and exploit the power domain …

Non-orthogonal multiple access (NOMA) holds the promise to be a key enabler of 5G
communication. However, the existing design of NOMA systems must be optimized to …

One of the most challenging issues in non-orthogonal multiple access (NOMA) based
cognitive radio networks (CRNs) is the power allocation (PA) problem. Moreover, the quality …

Non-orthogonal multiple access (NOMA) is considered a potential technique in fifth-
generation (5G). Nevertheless, it is relatively complex when applying NOMA to a massive …

Cognitive radio and non-orthogonal multiple access are promising to improve the spectrum
efficiency for the satellite-high altitude platform (HAP)-terrestrial networks. To achieve the …

In this paper, we investigate a downlink outage-constrained robust resource allocation
algorithm for achieving the robust transmission in power-domain non-orthogonal multiple …

Nonorthogonal multiple access (NOMA) exhibits superiority in spectrum efficiency and
device connections in comparison with the traditional orthogonal multiple access …