Recent intensive and extensive development of the fifth-generation (5G) of cellular networks
has led to their deployment throughout much of the world. As part of this implementation …

Internet of things (IoT) paradigm poses new challenges to the communication technology as
numerous heterogeneous objects will need to be connected. To address these issues new …

The radio frequency (RF) spectrum becomes overly crowded in some indoor environments
due to the high density of users and bandwidth demands. To accommodate the tremendous …

Abstract The US Federal Communications Commission (FCC) defines white space as the
channels that are unused at a specific location or time. For futuristic cognitive radio (CR) …

Cognitive radio networks (CRNs) are an emerging paradigm for next generation wireless
communication systems allowing for more efficient radio spectrum utilization. In order to …

We consider in this paper, a spectrum sharing cognitive radio system with a ratio selection
scheme; where one out of N independent-and-identically-distributed transmit antennas is …

In the scope of cognitive radio networks, typical routing protocols avoid areas that are highly
congested with primary users, leaving only a small fragment of available links for secondary …

Device-to-Device (D2D) communication and cognitive radio are among the key technologies
that can help to solve the bandwidth bottleneck problem of cellular networks. Such …

The capacity of cognitive radio (CR) systems can be enhanced significantly by deploying
relay nodes to exploit the spatial diversity. However, the inevitable imperfect sensing in CR …

Conventional designs of cognitive radio (CR) multiple-input multiple-output (MIMO) systems
mainly focus on the system throughput. Since nowdays the energy efficiency (EE) of wireless …