5638 search results - page 20 / 1128 » On presence |
ICC
2009
IEEE
14 years 4 months ago
2009
IEEE
—Detecting malicious packet dropping is important in ad hoc networks to combat a variety of security attacks such as blackhole, greyhole, and wormhole attacks. We consider the de...
GLOBECOM
2008
IEEE
14 years 4 months ago
2008
IEEE
Abstract— We present a collaborative algorithm to enable opportunistic spectrum access for cognitive radios in the presence of multiple co-channel transmitters. A spectrum hole d...
PIMRC
2008
IEEE
14 years 4 months ago
2008
IEEE
— In receivers, IQ imbalances have significant effects on the performance of data transmission. Comparison of the performance of different types of Orthogonal Space-Time Block Co...
VTC
2008
IEEE
14 years 4 months ago
2008
IEEE
Spectrum-overlay scenarios for wide-band multi-carrier (MC) systems bring new technical challenges along that must be considered during the system design. In such scenarios, the r...
VTC
2007
IEEE
14 years 3 months ago
2007
IEEE
Abstract— Spectrum-overlay scenarios for wideband multicarrier (MC) systems bring new technical challenges that must be considered during the system design. In such a scenario, t...