Abstract
Cognitive radio (CR) has emerged as a promising technology to exploit the unused portions of spectrum in an opportunistic manner. The fixed spectrum allocation of governmental agencies results in unused portions of spectrum, which are called "spectrum holes" or "white spaces". CR technology overcomes this issue, allowing devices to sense the spectrum for unused portions and use the most suitable ones, according to some pre-defined criteria. Spectrum assignment is a key mechanism that limits the interference between CR devices and licensed users, enabling a more efficient usage of the wireless spectrum. Interference is a key factor that limits the performance in wireless networks. The scope of this work is to give an overview of the problem of spectrum assignment in cognitive radio networks, presenting the state-of-the-art proposals that have appeared in the literature, analyzing the criteria for selecting the most suitable portion of the spectrum and showing the most common approaches and techniques used to solve the spectrum assignment problem. Finally, an analysis of the techniques and approaches is presented, discussing also the open issues for future research in this area.
| Original language | English |
|---|---|
| Article number | 6407454 |
| Pages (from-to) | 1108-1135 |
| Number of pages | 28 |
| Journal | IEEE Communications Surveys and Tutorials |
| Volume | 15 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2013 |
Bibliographical note
Funding Information:I am grateful to Erin Lauridsen, Director of Access Technology at the LightHouse for the Blind and Visually Impaired, for inspiring me to think closely about empathy as a driver for accessibility, David Sloan, Research Lead at TPGi, for helping me work through dimensions of accessibility and weave them into a coherent and effective call to action, and every person with accessibility needs who has taken the time to help me understand why and how to design accessible technology. I am also grateful for insights from Sarah Lewthwaite and Andy Coverdale, my colleagues on the Teaching Accessibility in the Digital Skill Set research team (teachingaccessibility.ac.uk). Funding. This work was supported by a UKRI Future Leaders Fellowship [grant number MR/S01571X/1].
Funding Information:
This work was supported by a UKRI Future Leaders Fellowship [grant number MR/S01571X/1].
Keywords
- channel assignment
- cognitive radio networks
- dynamic spectrum management
- spectrum allocation
- spectrum assignment
- spectrum selection
ASJC Scopus subject areas
- Electrical and Electronic Engineering