Cognitive radio (CR), non-orthogonal multiple access (NOMA), and full-duplex (FD)
communications have been considered key technologies for providing spectrum utilization …

Security is considered a critical issue in the deployment of 5G networks because of the
vulnerability of information that can be intercepted by eavesdroppers in wireless …

With the development of the Internet of Things (IoT), more and more devices are connected
in edge-cloud environment, and spectrum scarcity has become a major bottleneck for the …

Physical layer wireless communications are more and more essential, and are vulnerable to
malicious users owing to the nature of broadcast channels. Herein, we consider a …

Cognitive radio (CR) is regarded as the key technology of the 6th-Generation (6G) wireless
network. Because 6G CR networks are anticipated to offer worldwide coverage, increase …

Cooperative communication that integrates cognitive radio and non-orthogonal multiple
access is recognized as an emerging technology for fifth-generation and beyond wireless …

In this paper, we address the secrecy energy efficiency (SEE) optimization problem in a
cognitive radio network (CRN). The SEE is defined as the ratio of the secrecy rate and the …

This paper investigates the physical layer security (PLS) design of an untrusted relaying
network where the source node coexists with a multi-antenna eavesdropper (Eve). While the …

This paper investigates the physical layer security issue in an amplify-and-forward (AF) multi-
input multi-output (MIMO) two-way relay assisted cognitive radio (CR) nonorthogonal …

In this paper, we investigate the power allocation of primary base station (PBS) and
cognitive base station (CBS) across different orthogonal frequency division multiplexing …