Traditional spectrum allocation policies may result in temporarily unused radio spectrum.
Cognitive radio (CR) has emerged as a promising technology to exploit the radio spectrum …

In order to mitigate the shortage of wireless spectrum, the appealing concepts of cooperative
communication techniques and cognitive radio (CR) networks have been combined for the …

In this paper, we investigate the two-way communication between two users assisted by a
reconfigurable intelligent surface (RIS). The scheme that two users communicate …

The fifth-generation mobile network (5G) supports Internet of Things (IoT) devices and
processes large-scale data volumes through mobile devices. With this facility, we find a …

In this paper, we investigate beamforming design for cooperative secure transmission in
cognitive two-way relay networks, where the cognitive transmitter (CT) with multiple …

In this paper, we investigate the relay selection problem for two-way simultaneous wireless
information and power transfer (SWIPT) enabled cognitive radio networks. The system we …

The performance of secondary user in underlay cognitive networks is analyzed by
considering opportunistic selection of two-way full-duplex (FD)-based amplify-and-forward …

Cognitive Radio (CR) is an attractive technology to deal with current spectrum scarcity
problem, while cooperative relay can make distributed receivers benefit from spatial diversity …

Millimeter wave (mmWave) systems are emerging as an essential technology for enabling
extremely high data rate wireless communications. The main limiting factors of mmWave …

We develop robust resource-allocation schemes for a cognitive radio network (CRN), where
the secondary users (SUs) try to communicate with each other from different small cell …