With the rapid development of wireless communication, the scarcity of spectrum becomes
more and more prominent. Cognitive radio is proposed to overcome the problem of low …

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

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 …

Various studies propose, massive portion of assigned spectrum are still unutilized, and
spectrum band usage are approximately 15% to 85%. Cognitive radio (CR) has been …

This paper provides an overview of major problems that are confronting wireless
communication with regard to spectrum use in general ie by all sectors, government, private …

During the last decade, Cognitive Radio (CR) has become a popular research topic. The
availability of radio spectrum is in shortage, and CR technology can solve the problem by …

The rapid growth in wireless communications has contributed to a huge demand on the
deployment of new wireless services in both the licensed and unlicensed frequency …

Cognitive Radio (CR) is a comparatively new technology in which problems like
underutilization of spectrum and spectrum scarcity is solved based on the revolutionary …

Spectrum is a very precious resource and thus underutilization of a large part of allocated
spectrum is not affordable. Where increasing demand for wireless applications has made it …

Due to the huge number of diverse wireless devices and technologies, spectacular
increases in the number of wireless subscribers, advent of new applications and continuous …