… Cognitive cellular networks, as defined in this article, are cellular networks that employ
cognitive radio to lease addition spectrum outside the licensed cellular bands [3]. The radio …

… the total spectral efficiency of the cognitive radio system as well as the spectral efficiency gains
… overall system spectral efficiency by considering cognitive communications in the system. …

… At the link level, we analyze the required energy to achieve a specific spectral efficiency for
a CR channel under two different types of power constraint in different fading environments. …

… spectrum efficiency with multiple cognitive radio sensors … radio’s access schemes. Then,
we provide the traffic model. Note that, in the rest of paper, we denote CRs for cognitive radio …

… SE-EE tradeoff for cognitive radio (CR) networks with co-operative spectrum sensing (…
efficiently utilized. Thus, enormous works have been devoted to improving the spectrum efficiency …

… the cognitive radio considering its configurability. We propose a general metric SEE (Spectral/Energy
Efficiency… The closed-form solutions further facilitate the adaptivity of cognitive radio …

… evaluate the tradeoff between energy efficiency (EE) and spectral efficiency (SE) in
cognitive radio networks (CRNs). The proposed framework is discussed in three typical CRN …

… In this paper, we discuss the joint improvement of the energy efficiency (EE) and the spectrum
efficiency (SE) in OFDM-based cognitive radio (CR) networks. A multi-objective resource …

… spectral efficiency and utilization in an overlay CRN is also termed cooperative cognitive
radio … This article introduces two cooperation frameworks in CCRN to improve spectral effi…

… Specifically, our objective is to maximize the spectrum efficiency (SE) of the UAV by
jointly optimizing the sensing radian and the number of radians. For the single-radian and …