Blind Equalization for Unitary Space-Time Modulation
Prof. Urbashi Mitra
Department of Electrical Engineering
University of Southern California
Friday, September 13th, 3:00 PM, ENS 637
ubli@ceng.usc.edu
Abstract
Multiple antenna transmit diversity schemes have gained recent attention
due to the promise of increased capacity and improved performance in
wireless
systems. Among these schemes, unitary space-time modulation and
differentially
encoded unitary space-time modulation allow for simple non-coherent
decoding
for flat fading channels. We present a new blind equalization algorithm
for these
transmission schemes in inter-symbol interference (ISI) channels. A
matrix-type
constant modulus algorithm (CMA) which exploits the unitary structure of
the space-time
codes is developed. The equalizer can be paired with a non-coherent
decoder
resulting in a completely blind, low complexity method for decoding in
the presence
of ISI. We examine the convergence of the proposed method and consider
performance
enhancement over a flat fading scenario where no adaptive equalization is
required.
Biography
Urbashi Mitra received the B.S. and the M.S. degrees from the
University of California at Berkeley in 1987 and 1989
respectively, both in Electrical Engineering and Computer
Science. From 1989 until 1990 she worked as a Member of Technical
Staff at Bellcore in Red Bank, NJ. In 1994, she received her
Ph.D. from Princeton University in Electrical Engineering. From
1994 to 2000, Dr. Mitra was an Assistant Professor in the
Department of Electrical Engineering at The Ohio State
University, Columbus, Ohio. She became an Associate Professor
in 2000 and currently holds that position in the Department of
Electrical Engineering at the University of Southern California,
Los Angeles. She was an Associate Editor for the IEEE
Transactions on Communications from 1996-2001. Dr. Mitra is
currently a member of the IEEE Information Theory Board of
Governors. She is the recipient of: 2001 Okawa Foundation Award,
2000 Lumley Award for Research (OSU College of Engineering), 1997
MacQuigg Award for Teaching (OSU College of Engineering), 1996
National Science Foundation (NSF) CAREER Award, 1994 NSF
International Post-doctoral Fellowship, 1998 Lockheed Leadership
Fellowship, 1987 California Microelectronics Fellowship. Along
with Steve McLaughlin of Georgia Tech, she will co-chair the IEEE
Communication Theory Mini-Conference at ICC 2003 in Anchorage,
Alaska. For Fall 2002, she will be a Texas Instruments Visiting Professor
at Rice University.
A list of Wireless Networking and Communications Seminars is available at
from the ECE department Web pages under "Seminars".
The Web address for the Wireless Networking and Communications Seminars is
http://signal.ece.utexas.edu/seminars