43 search results - page 5 / 9 » Spectral Efficiency of Cognitive Radio Systems |
EJWCN
2010
14 years 5 months ago
2010
The spectrum scarcity problem emerged in recent years, due to unbalanced utilization of RF (radio frequency) bands in the current state of wireless spectrum allocations. Spectrum a...
ICC
2008
IEEE
15 years 4 months ago
2008
IEEE
—Cognitive radio (CR) dynamically accessing inactive radio spectrum of the primary system (PS) at link level has attracted a lot of research interests. The cognitive radio networ...
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GLOBECOM
2010
IEEE
14 years 7 months ago
2010
IEEE
Cognitive radio (CR) emerges as a key technology to enhance spectrum efficiency and thus creates opportunistic transmissions over links. Supporting the routing function on top of n...
CORR
2010
Springer
14 years 10 months ago
2010
Springer
Abstract--In cognitive radio (CR) networks with multipleinput multiple-output (MIMO) links, secondary users (SUs) can exploit "spectrum holes" in the space domain to acce...
PIMRC
2008
IEEE
15 years 4 months ago
2008
IEEE
— One of the main task to be done by a cognitive receiver is to sense its spectral environment in order to distinguish surrounding systems from each others. Actually most systems...