Recently, non-orthogonal multiple access (NOMA)-enabled cognitive satellite-unmanned
aerial vehicle (UAV)-terrestrial networks have attracted extensive attention for the …

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 …

Cooperative and cognitive non-orthogonal multiple access (CCR-NOMA) has been
recognized as a promising technique to overcome spectrum scarcity and massive …

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 …

Unmanned aerial vehicles (UAVs) are developing rapidly owing to flexible deployment and
access services as air base stations. However, the channel errors of low-altitude …

In this article, we investigate the performance of spectrum sharing inunderlay cognitive radio
(CR)-inspired nonorthogonal multiple access (NOMA) systems, at which a primary …

Energy-saving techniques are vital for the battery-powered sensor devices (SDs), which
affect their lifetime. In this paper, we propose an air-and-ground cooperative wireless sensor …

Aerial-ground interference mitigation is a challenging issue in the emerging cellular-
connected unmanned aerial vehicle (UAV) communications. Due to the strong line-of-sight …

Current fifth-generation (5G) networks do not cover maritime areas, causing difficulties in
developing maritime Internet of Things (IoT). To tackle this problem, we establish a …

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 …