منابع مشابه
Spectrum Buyouts A Mechanism to Open Spectrum
The “shortage” of radio spectrum is usually attributed to the scarcity of spectrum, but it is due to the inefficiency of radio technologies and spectrum management. Regulatory reforms are being proposed to assign exclusive rights to spectrum, but such reforms would be harmful because the spectrum is not a property but a protocol by which information is carried. New packet radio technologies ena...
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To deal with the current spectrum scarcity problem and exploiting the fact that exclusive access through tightly regulated licensing leads to idle spectrum, cognitive radio has been proposed as a way to reuse this underutilized spectrum in an opportunistic manner, i.e., allowing the use of temporarily unused licensed spectrum to secondary users who have no spectrum licenses. To protect the lice...
متن کاملTransmit Beamforming for Open Spectrum Communication Systems
Future wireless communication networks are meant to coexist in a high interference scenario. Indeed, both academia and industry are considering that the current frequency splitting spectrum management will not be able to support the future high data rate traffic. Therefore, different transmitters might share frequency and time resources in order to maximize the spectral efficiency. In those sys...
متن کاملOpen String Spectrum in pp-wave background
In this paper, we consider the D-brane, especially D−-brane, in the pp-wave background, which has the eight dynamical and the eight kinematical supercharges. Since the pp-wave background has not a SO(8) but a SO(4)× SO(4) symmetric group, the D-brane world-volume theory has a non-trivial symmetric group which depends on the configuration of D-brane. Here, we will analyze the open string spectru...
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ژورنال
عنوان ژورنال: Queue
سال: 2003
ISSN: 1542-7730,1542-7749
DOI: 10.1145/846057.864028