49 search results - page 2 / 10 » Cooperative Multi-relay Scheme for Secondary Spectrum Access |
ICC
2009
IEEE
13 years 12 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
12 years 8 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
13 years 11 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
13 years 11 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
12 years 9 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...