332 search results - page 56 / 67 » Opportunistic Spectrum Access in Cognitive Radio Networks |
TWC
2010
14 years 4 months ago
2010
Abstract--In this paper, we propose a novel spectrum occupancy model designed to generate accurate temporal and frequency behavior of various wireless transmissions. Our proposed w...
ICWN
2003
14 years 11 months ago
2003
— Most wireless systems receive a license that gives them exclusive access to a block of spectrum. Exclusivity guarantees adequate quality of service, but it also leads to inefï¬...
105
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CISS
2008
IEEE
14 years 11 months ago
2008
IEEE
Cognitive radios permit dynamic control of physical layer resources such as transmission power and constellation size; these degrees of freedom can be employed to achieve significa...
90
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GLOBECOM
2008
IEEE
15 years 4 months ago
2008
IEEE
— In this paper, we study the weighted sum rate maximization of multicell cellular cognitive radio networks (CRNs) which are overlaid with multicell primary radio networks (PRNs)...
100
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INFOCOM
1999
IEEE
15 years 1 months ago
1999
IEEE
A new multichannel MAC protocol called Hop-Reservation Multiple Access (HRMA) for wireless ad-hoc networks (multi-hop packet radio networks) is introduced, specified and analyzed. ...