| T7
- Space-Time Signal Processing |
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Speakers
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Robert
Calderbank and Naofal Al-Dhahir, AT&T
Research Labs
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Duration
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1/2
Day
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Start
Time
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9h00 |
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Abstract
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Space-time
coding (STC) has emerged over the past few years
as a new paradigm for optimally combining modulation,
coding, and diversity gains over wireless links.
It is ideal for improving the downlink performance
(which is the bottleneck in asymmetric applications
such as Internet browsing and downloading) while
keeping user terminals lightweight and cost effective.
STC was originally developed for frequency-flat
quasi-static fading channels. Extensive recent research
has focused on extending it to frequency-selective
fading channels. Detection of space-time-coded signals
presents a significant signal processing challenge
as multiple coded, distorted, and faded copies of
the desired signal are superimposed at each receive
antenna and corrupted by noise and possibly multi-user
interference.
In the first part of this tutorial, we discuss STC
fundamentals for narrowband transmissions. Then,
in the second part we discuss STC for broadband
wireless transmission. The emphasis is on physical-layer
modem algorithms such as channel estimation, equalization,
and interference cancellation. However, we also
discuss the impact of STC gains at the physical
layer on throughput at or above the networking layer.
Simulation results from the EDGE cellular system
and the 802.11 wireless LAN environment are presented.
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Short
Biography of the Speaker(s):
Robert Calderbank is Vice President for research at AT&T.
He is also responsible for directing the research program in Internet
and network systems. This program provides AT&T with technical
and industry leadership in all areas of networking technology.
These areas include network security, content distribution, operations
support, network measurement and management, and end to end optical
systems.
Dr. Calderbank is an IEEE and AT&T Fellow, and a recipient of
the IEEE Third Millenium Medal for his contributions to digital
communications. These include the design of high speed voiceband
modems, the development of advanced read channels for magnetic
disk storage, and the invention of space-time codes, a breakthrough
wireless technology that uses a small number of antennas to significantly
improve throughput and reliability.
Naofal Al-Dhahir received his MS and PhD degrees from Stanford
University in 1990 and 1994, respectively, in Electrical Engineering.
He was an Instructor at Stanford University during Winter 1993.
From August 94 to July 99, he was a member of the technical staff
at the Communications Program at GE Corporate R&D Center where
he worked on various aspects of satellite communication systems
design and anti-jam GPS receivers. Since August 99, he has been
a principal member of technical staff at AT&T Shannon Laboratory
in Florham Park, NJ. His current research interests include equalization
schemes, space-time coding and signal processing, OFDM, and digital
subscriber line technology. He has authored over 40 journal papers
and holds 7 US patents. He is a Senior Member of the IEEE and
a member of the IEEE SP4COM technical committee. He is Associate
Editor for IEEE Transaction on Signal Processing, IEEE Communications
Letters, and IEEE Transactions on Communications.
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