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                                ECE SEMINAR SERIES

                          THURSDAY, FEBRUARY 10, 2000
                                    4:00 PM

                           Refreshments - 3:30 PM

                       SCAIFE HALL AUDITORIUM, ROOM 125
                                  __________

                       ``AN INTRODUCTION TO TURBO CODING''

                       Prof. Vijayakumar Bhagavatula (Kumar)
                                Carnegie Mellon


                                     BIO

Vijayakumar Bhagavatula ("Kumar") is Professor of Electrical and
Computer Engineering (ECE) at Carnegie Mellon University (CMU). He
received his B.Tech. and M.Tech. degrees in Electrical Engineering
from the Indian Institute of Technology, KanpurJ and his Ph.D. in
Electrical Engineering from CMU. A faculty member in the ECE Department
at CMU since 1982, Kumar also served as its Associate Department Head from
July 1994 through June 1996. His current research interests span the
areas of coding and signal processing for data storage, image processing,
wireless communications and pattern recognition. He has authored or
co-authored seven book chapters and about two hundred and thirty papers
in these areas. He served as an editor of Applied Optics from 1991 through
1996. Kumar is a member of Sigma Xi, a Senior Member of the IEEE, a
Fellow of SPIE and a Fellow of the Optical Society of America (OSA).


                                  ABSTRACT

Turbo coding, introduced only about six years ago, has become the
focus of much current coding and communications research, as the error
correction performance of Turbo codes seems to approach tantalizingly close
to the Shannon bound. Because of their ability to provide excellent error
correction in low-SNR situations, Turbo codes have naturally attracted
wireless communications and digital data storage among other applications.
This presentation is aimed at introducing this hot new topic of Turbo codes.
Towards that end, the talk will start with a brief introduction to the
basics ofJ error correcting coding (ECC).

Then the basics of Turbo codes will be presented. This will be followed by
an explanation of the BCJR algorithm, a key component of Turbo decoding.
Then I will review some methods for using Turbo coding in conjunction with
the partial response (PR) equalization of use in data storage channels.
Turbo coding involves many underlying choices (e.g., constituent codes,
precoders, interleaver sizes, etc.) and I will show some illustrative results.
Next, I will discuss a class of codes known as low density parity check
(LDPC) codes that are appealing because of their computational simplicity.
This talk will conclude with a brief look at some of the current Turbo
coding research issues.