512 search results - page 19 / 103 » Random Access Systems with a Time Varying Channel |
CDC
2008
IEEE
14 years 5 months ago
2008
IEEE
—We study the problem of dynamic spectrum sensing and access in cognitive radio systems as a partially observed Markov decision process (POMDP). A group of cognitive users cooper...
INFOCOM
2010
IEEE
13 years 9 months ago
2010
IEEE
—Despite much research on the throughput of relaying networks under idealized interference models, many practical wireless networks rely on physical-layer protocols that preclude...
CORR
2008
Springer
13 years 11 months ago
2008
Springer
Abstract-- We consider code division multiple access communication over a binary input additive white Gaussian noise channel using random spreading. For a general class of symmetri...
ITIIS
2010
13 years 9 months ago
2010
Cognitive Radio is an advanced enabling technology for the efficient utilization of vacant spectrum due to its ability to sense the spectrum environment. It is important to determ...
INFOCOM
2003
IEEE
14 years 4 months ago
2003
IEEE
— Multiuser diversity refers to a type of diversity present across different users in a fading environment. This diversity can be exploited by scheduling transmissions so that us...