 |
TITLE: Fading Wireless Networks: The Interference Case
SPEAKER: Lalitha Sankar (Princeton University)
DATE: 11:00 AM - 12:00 noon, Wednesday, November 19, 2008
LOCATION: Tioga, 3U
ABSTRACT:
The two unique characteristics of wireless channels are fading and
interference. A fundamental challenge in wireless network design is
developing optimal interference-resistant communication schemes that
maximize the network throughput. Much attention has been given to
determining the sum-capacity of a network of two interfering wireless
links, referred to as a two-user interference channel (IFC), in the
non-fading setting. In this talk, we focus on a two-user IFC with
ergodic fading interfering links and develop its sum-capacity for
specific classes that are uniquely identified by the transmit powers
and fading statistics. Under the assumption of perfect channel state
information at all nodes, we present the conditions under which
decoding the interference at both receivers is optimal for the classes
of ergodic strong but not very strong and ergodic very strong IFCs. In
contrast, for the case where the interference is weak, we demonstrate
the optimality of ignoring interference for a class of uniformly weak
one-sided IFCs in which only one of links experiences
interference. For all three classes, our results shed light on the
optimality of encoding and decoding independently over the parallel
fading channels.
BIOGRAPHY:
Lalitha Sankar received the Ph.D degree in Electrical Engineering
from Rutgers University in October 2007. She is presently a Science
and Technology postdoctoral teaching fellow at Princeton
University. Prior to her doctoral work, Lalitha was a Senior Member of
Technical Staff at AT&T Shannon Labs, Florham Park, NJ. For her
doctoral work, Lalitha received the 2007-2008 Electrical Engineering
Academic Achievement Award from Rutgers University.
|
|
|
printable version
