The stringent requirements of wireless multimedia transmission lead to very high radio
spectrum solicitation. Although the radio spectrum is considered as a scarce resource, the …

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

The cognitive radio (CR) paradigm for designing next‐generation wireless communications
systems is becoming increasingly popular, and different aspects of it are being implemented …

It has been 20 years since the concept of cognitive radio (CR) was proposed, which is an
efficient approach to provide more access opportunities to connect massive wireless …

Dynamic spectrum access and cognitive radio (CR) are emerging technologies to utilize the
scarce frequency spectrum in an efficient and opportunistic manner. They have been …

Presently, we rely on the wireless devices and systems to not only enable on-demand,
pervasive communications for a large proportion of the population, but also other critical …

With the rapid deployment of new wireless devices and applications, the last decade has
witnessed a growing demand for wireless radio spectrum. However, the fixed spectrum …

Over the last decade, cognitive radios (CRs) have emerged as a technology for improving
spectrum efficiency through dynamic spectrum access techniques. More recently, as …

Cooperative relay enables multihop cognitive radio networks of cognitive radios (CRs) and
nodes of primary system. However, successful CR networking functions such as routing …

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 …