Abstract
The concept of Cognitive Radio (CR) appeared as a new paradigm in 1999 as an extension of Software Defined Radio (SDR). It describes the situation where intelligent radio devices and associated network entities communicate in such a manner that they are able to adjust their operating parameters according to the needs of the user/network, and learning from experience at the same time. Since then, there has been a significant amount of effort in the research community on CR-related topics. Standardization activities on Cognitive Radio Systems (CRS) (including TV WhiteSpaces—TVWS) have also been initiated and progressed in many standardization bodies. Almost all regulatory bodies in the USA, Europe and Asia–Pacific regions have acknowledged the importance of CRS on shaping the way spectrum is allocated. Regulators like FCC in USA and Ofcom in UK have opened the door for secondary access to unlicensed devices on TV bands. Finally, world radiocommunication conference (WRC) 2012 witness discussions on the required regulatory changes to allow the introduction of CRS. Despite all this progress, CR is mostly a research topic today, and the wireless market has not seen a mass commercial deployment/exploitation of the CR technology yet. Mitola’s full CR still remains a futuristic concept where a ubiquitous cognition is embedded into all types of devices/equipments/applications which are aware of our needs/wishes, executing them and rendering our daily lives easier.
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- 1.
Note that the term secondary communications may also include information exchange on spectrum sensing for the purpose of enhancing detection accuracy. This occurs when CRs perform sensing in a collective manner, and is known as collaborative and/or cooperative sensing.
- 2.
The theme of FP6 IST is mobile and wireless systems beyond 3G and broadband for all.
- 3.
The European Radio equipment and Telecommunications Terminal Equipment Directive http://www.etsi.org/website/Technologies/RTTE.aspx.
- 4.
Note that here, we are referring to statistical propagation models which are relatively computationally handy; and not to ray-tracing models which are precise but quite cumbersome.
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Sayrac, B. (2012). Introduction to Cognitive Radio . In: Venkataraman, H., Muntean, GM. (eds) Cognitive Radio and its Application for Next Generation Cellular and Wireless Networks. Lecture Notes in Electrical Engineering, vol 116. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1827-2_1
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