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SUMMARY:Exploiting Channel Diversity in White Spaces - Bozidar Radunovich\
 , Microsoft Research Cambridge
DTSTART:20100714T130000Z
DTEND:20100714T140000Z
UID:TALK25475@talks.cam.ac.uk
CONTACT:Andrew Rice
DESCRIPTION:In a recent ruling\, FCC has enabled an unlicensed use of the 
 vacated analogue broadcast TV spectrum\, called "White Spaces"\, provided 
 that the unlicensed devices detect and avoid primary users (remaining TV c
 hannels and wireless MICs). The offered frequency space is very wide and h
 as excellent propagation characteristics\, hence the ruling offers a huge 
 potential to develop high-quality\, cheap and ubiquitous wireless access\,
  and it also poses several novel design challenges (detecting primaries\, 
 network asymmetries\, channel selections\, etc). In this work we focus on 
 the problem of channel and rate selections for white-spaces. We start by p
 resenting measurements using an indoor testbed operating in the 500 to 600
 MHz band\, and demonstrate that the key challenge is handling variable cha
 nnel quality. The measurements show that there is significant potential be
 nefit from selecting the best channel and adapting the transmission rate w
 hile also revealing non-stationary channel characteristics. The proposed l
 earning algorithms are well suited to non-stationary environments and atte
 mpt to minimize "regret" with respect to a best or oracle-like algorithm. 
 The novel aspects of the algorithms includes (i) accounting for the cost i
 ncurred when switching channels and synchronization costs\, (ii) exploitin
 g inherent correlations between the effective throughputs achieved when se
 lecting the same channel but different transmission rates.  We further ext
 end the algorithms to account for fairness issues in network scenarios whe
 re several users are served by an access point.\n\nBozidar Radunovic is a 
 Researcher in the Systems and Networking group at Microsoft Research\, Cam
 bridge. His research interests are in architecture and performance evaluat
 ion of computer systems with particular interest in wireless communication
 \, cross-layer design and application of advanced communication techniques
  in network system design. Bozidar received his PhD in technical sciences 
 from EPFL\, Switzerland\, in 2005\, and his BSc at the School of Electrica
 l Engineering\, University of Belgrade\, Serbia\, in 1999. He was a PhD st
 udent at LCA\, EPFL from 2000-2005. Then he did a one year post-doc at TRE
 C\, at ENS Paris\, in 2006. He also did a 6 month internship in IBM Zurich
  Research Labs in winter 2004/05. In 2008 he has been awarded IEEE William
  R. Bennett Prize Paper Award in the Field of Communications Systems.
LOCATION:SS03\, William Gates Building
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