Cognitive radio technologies enable users to opportunistically access unused licensed
spectrum and are viewed as a promising way to deal with the current spectrum crisis. Over …

Cognitive radio technology can significantly improve spectrum utilization efficiency via
enabling secondary users to access licensed spectrum dynamically without harmful …

Due to the increasing demand for new wireless services and applications as well as the
increasing number of wireless users, the available spectrum is becoming increasingly …

Cognitive radio networks will provide high bandwidth to mobile users via heterogeneous
wireless architectures and dynamic spectrum access techniques. However, CR networks …

Cognitive radio technology enables secondary users (SUs) to opportunistically use the
vacant licensed spectrum and significantly improves the utilization of spectrum resource …

Under utilization of radio spectrum in traditional wireless communication systems [30], along
with the increasing spectrum demand from emerging wireless applications, is driving the …

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 …

Abstract Cognitive Radio Networks (CRNs) have been receiving significant research
attention recently due to their ability to solve issues associated with spectrum congestion …

Cognitive radio networks hold the key to achieving better radio bandwidth utilization and
improving the quality of wireless applications. The next step in this fast emerging paradigm …

Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access:
the policy that addresses the spectrum scarcity problem that is encountered in many …