In 5G systems, enhancing the energy efficiency (EE) and spectrum efficiency (SE) is a
significant task that is capable of fulfilling the demand of future wireless networks and …

Green communications is an inevitable trend for future communication network design,
especially for a cognitive radio network. Power allocation strategies are of crucial …

This paper investigates energy-efficient device-to-device (D2D) communications in cellular
networks. We aim to maximize the overall energy-efficiency (EE) of D2D users and regular …

Heterogeneous networks provide flexible deployments for operators to improve spectrum
efficiency and increase coverage. However, driven by new generation wireless devices, the …

Wireless powered techniques have been recognized as promising techniques in future
wireless communication systems, especially in cognitive radios (CRs) with energy-limit …

We propose a camera that measures static gradients instead of static intensities. Quantizing
sensed intensity differences between adjacent pixel values permits an ordinary A/D …

The two prime elements that govern future wireless communications are energy efficiency
and efficient spectrum utilization. To accomplish these objectives, various emerging …

In this paper, a downlink security-aware resource allocation problem with delay constraint
via spectrum sensing is modeled as a mixed integer non-linear problem for non-orthogonal …

We investigate the energy efficiency (EE) in cognitive radio networks, where cognitive users
are allowed to access a licensed frequency band opportunistically, provided that the …

In this paper, we investigate the achievable energy efficiency of cognitive radio networks
where two main modes are of interest, namely, spectrum sharing (known as underlay …