INTRODUCTION................................................................................... 249 I. BACKGROUND ................................................................................. 251 A. History of Regulation of the Electromagnetic Spectrum.... 251 B. Secondary Markets and Interruptible Leasing ..................... 254 II. DEFINITION................................................

Recent advances in communication technologies and the proliferation of wireless computing and communication devices make the radio spectrum overcrowded. However, experiments from the Federal Communication Commission (FCC) reveals that the spectrum utilization varies from 15%− 85%. Consequently, Cognitive Radio Networks (CRNs) are proposed to utilize the radio spectrum opportunistically. In type...

Cognitive Radio (CR) is aimed at increasing the efficiency of spectrum utilization by allowing unlicensed users to access, in an opportunistic and non-interfering manner, some licensed bands temporarily and/or spatially unoccupied by the licensed users. The analysis of CR systems usually requires the spectral activity of the licensed system to be represented and characterized in a simple and tr...

On the feasibility of cognitive radio

One of today’s most important developing wireless technologies is Cognitive Radio (CR). In our current fixed-assignment spectrum management policy, much of the available frequencies go unused. CR aims to make use of this unutilized space to provide wireless broadband services. This paper aims to give a background to CR and describe the key players in standardization and allocation of the unused...

In an effort to find ways of meeting the increasing demand for spectrum, researchers tried observing the actual utilization (in licensed band) over the temporal and spatial dimensions. Surprisingly FCC found that actual utilization over certain time and spatial location was as low as 15%. Capitalizing on this observation, Joseph Mitola III proposed the idea of cognitive radio for dynamic spectr...