Cognitive radio networks (CRNs) are composed of cognitive, spectrum-agile devices
capable of changing their configurations on the fly based on the spectral environment. This …

Recent research in the emerging field of cognitive radio (CR) has mainly focussed on
spectrum sensing and sharing, that allow an opportunistic use of the vacant portions of the …

Routing is a fundamental issue to consider when dealing with multihop cognitive radio
networks. We investigate in this work, the potential routing approaches that can be …

Cognitive radio ad hoc networks (CRAHNs) constitute a viable solution to solve the current
problems of inefficiency in the spectrum allocation, and to deploy highly reconfigurable and …

Cognitive radio (CR) technology enables the opportunistic use of the vacant licensed
frequency bands, thereby improving the spectrum utilization. However, the CR operation …

Although more than a decade has passed from the proposal of the Cognitive Radio
paradigm, in these years the research has mainly focused on physical and medium access …

The problem of spectrum scarcity and inefficiency in spectrum usage will be addressed by
the newly emerging cognitive radio paradigm that allows radios to opportunistically transmit …

The majority of work in cognitive radio networks have focused on single-hop networks with
mainly challenges at the physical and MAC layers. Recently, multi-hop secondary networks …

This book describes a communication paradigm that could shape the future of wireless
communication networks, Opportunistic Spectrum Access (OSA) in Cognitive Radio …

Cognitive radio technology holds great promises in enabling unlicensed operation in
licensed bands, to meet the increasing demand for radio spectrum. The new open spectrum …