Cognitive radio (CR) is one of the currently most researched topics in wireless communication, motivated by the digital changeover all over Europe. The idea of CR in white space is to install an opportunistic communication system in a given frequency band which remains hidden from the incumbent system. Nevertheless, it is also important that the opportunistic system should not disturb the incumbent ones by any means. The opportunistic system scans the band for gaps in the spectra which could be used for transmission. The standardization of CR for white space has also been started by IEEE, currently it is in draft stage (IEEE 802.22 [1], IEEE 1900.6 [2]). Also, numerous international projects dealing with this topic have been curried out in the recent years:
· Physical layer for dynamic spectrum access and cognitive radio (Phydyas): www.ict-phydyas.org/
· Quality of Service and MObility driven cognitive radio Systems (Qosmos): www.ict-qosmos.eu/
· Cognitive Radio Experimentation World (CREW): www.crew-project.eu/
· Cognitive Radio Oriented Wireless Networks (CROWN): http://www.fp7-crown.eu/
These systems will be especially important with the new era of digital television which induces spectral white spaces left behind by ceased analog transmissions.
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Kollár Zsolt