Methods for reducing interference caused to licensed systems by overlay-CSMA/CA cognitive radios

Adamis, AV; Maliatsos, KN; Constantinou, P

dc.contributor.author	Adamis, AV	en
dc.contributor.author	Maliatsos, KN	en
dc.contributor.author	Constantinou, P	en
dc.date.accessioned	2014-03-01T02:45:34Z
dc.date.available	2014-03-01T02:45:34Z
dc.date.issued	2008	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32304
dc.subject	Cognitive Radio	en
dc.subject	Overlay Network	en
dc.subject	Spectrum	en
dc.subject.other	Computer networks	en
dc.subject.other	Cognitive radio	en
dc.subject.other	Cognitive radios	en
dc.subject.other	International conferences	en
dc.subject.other	Wireless networks	en
dc.subject.other	Cognitive systems	en
dc.title	Methods for reducing interference caused to licensed systems by overlay-CSMA/CA cognitive radios	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/CROWNCOM.2008.4562472	en
heal.identifier.secondary	4562472	en
heal.identifier.secondary	http://dx.doi.org/10.1109/CROWNCOM.2008.4562472	en
heal.publicationDate	2008	en
heal.abstract	Cognitive Radios (CR) have recently appeared as a solution to the spectrum scarcity problem, caused by static licensing policies. CRs can utilize spectral opportunities when and where Licensed Systems (LS) remain idle, operating in an overlay mode under the major restriction of not causing harmful interference to them.In this Paper1, first, we investigate the IEEE 802.11 DCF behavior in the overlay network, in terms of interference caused to the LS. The importance of the three way hand shake mechanism in the overlay scenario is discovered. Then, we introduce a 3rd state to the carrier sensing mechanism of the CR stations and we extend the DCF functionality by exploiting the new state. Two new protocols that utilize the new mechanism are proposed, both of which achieve substantial reduction in the interference caused to the LS. The second protocol also improves the performance of the CR Network in terms of throughput.	en
heal.journalName	Proceedings of the 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications, CrownCom 2008	en
dc.identifier.doi	10.1109/CROWNCOM.2008.4562472	en