49 search results - page 2 / 10 » Cooperative Multi-relay Scheme for Secondary Spectrum Access |
ICC
2009
IEEE
14 years 5 months ago
2009
IEEE
—In this paper we propose a new low feedback and low complexity scheme that adjusts the phases at the relays, thus allowing for the coherent combining of signals from multiple re...
INFOCOM
2011
IEEE
13 years 2 months ago
2011
IEEE
—Dynamic spectrum allocation has proven promising for mitigating the spectrum scarcity problem. In this model, primary users lease chunks of under-utilized spectrum to secondary ...
CISS
2008
IEEE
14 years 5 months ago
2008
IEEE
Cognitive radio is a desirable technique for secondary users to utilize the spectrum gray space. In order to avoid intolerable interference to primary users, the transmission powe...
GLOBECOM
2007
IEEE
14 years 5 months ago
2007
IEEE
— Spectrum sensing is a key enabling functionality in cognitive radio (CR) networks, where the CRs act as secondary users that opportunistically access free frequency bands. Due ...
ICASSP
2011
IEEE
13 years 2 months ago
2011
IEEE
Successful spectrum sharing in a cognitive radio network depends on the correct and quick detection of primary activity. Cooperative spectrum sensing is therefore suggested to enh...