The next phase of satellite technology is being characterized by a new evolution in non-
geostationary orbit (NGSO) satellites, which conveys exciting new communication …

Cognitive radio (CR) can successfully deal with the growing demand and scarcity of the
wireless spectrum. To exploit limited spectrum efficiently, CR technology allows unlicensed …

In this paper, we explore the physical-layer security in cooperative wireless networks with
multiple relays where both amplify-and-forward (AF) and decode-and-forward (DF) protocols …

This paper investigates physical layer security (PLS) in cognitive radio inspired non-
orthogonal multiple access (CR-NOMA) networks with multiple primary and secondary …

Focusing on two-antenna infrastructure relays employed for coverage extension, we
develop hybrid techniques that switch opportunistically between full-duplex and half-duplex …

In the present scenario, an energy efficiency has become a matter of prime importance for
wireless networks. To meet the demands of an increased capacity, an improved data rate …

Device-to-device (D2D) communications has been proposed in the literature as an underlay
approach to cellular networks to allow direct transmission between two cellular devices with …

In this paper, we study a hybrid satellite-terrestrial spectrum sharing system (HSTSSS) in
which multiple terrestrial secondary networks cooperate with a primary satellite network for …

In this paper, we consider a cognitive radio network that consists of one cognitive base
station (CBS) and multiple cognitive users (CUs) in the presence of multiple eavesdroppers …

Physical-layer security is emerging as a promising paradigm of securing wireless
communications against eavesdropping between legitimate users, when the main link …