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TITLE: Wireless network simplification: the Gaussian N-relay diamond network
SPEAKER: Ayfer Ozgur (Stanford University)
DATE: 2:00 - 3:00 PM, Tuesday, June 19, 2012
LOCATION: Eureka, 1U
ABSTRACT:
Consider a source that communicates to a destination with the help of
relays in a wireless network. The question we ask in this talk is, can
we achieve (a good part of) the capacity by using only a (small)
subset of the relays? We investigate this question for the Gaussian
N-relay diamond network. This is a two-stage network, where the source
node is connected to N relays through a broadcast channel and the
relays are connected to the destination through a multiple-access
channel. We show that in every N-relay diamond network, there exists a
subset of k relays which alone provide approximately a fraction
k/(k+1) of the total capacity. We discuss extensions of this result to
the diamond network with multiple antennas. The discussion reveals
connections to submodular flows and Non-Shannon information
inequalities.
BIOGRAPHY:
Ayfer Ozgur has been an Assistant Professor in the Information Systems
Laboratory at Stanford University since 2012. Before joining Stanford,
she was a postdoctoral researcher in the Algorithmic Research on
Networked Information group at EPFL, Switzerland. She received her
Ph.D. degree in 2009 from the Information Processing Group at EPFL and
B.Sc. (2001) and M.Sc.(2004) degrees in electrical engineering and
physics from Middle East Technical University, Turkey. From 2001 to
2004, she worked as a hardware design engineer for the Defense
Industries Research and Development Institute in Turkey. She received
the EPFL Best Thesis Award for her Ph.D. dissertation in 2010. Her
research interests are in wireless and network communication,
information and coding theory.
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