Tutorials

 T7 - Space-Time Signal Processing


Speakers
Robert Calderbank and Naofal Al-Dhahir, AT&T Research Labs
Duration
1/2 Day
Start Time
9h00
Abstract
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.


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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