OFDM for Broadband Multimedia Communications

Prof. Gordon L. Stuber

Pettit Professor in Communications
Wireless Systems Laboratory (WSL)
School of Electrical and Computer Engineering
Georgia Institute of Technology
Atlanta, GA 30332, USA

Friday, December 6th, 3:00 PM, ENS 637

stuber@ece.gatech.edu

Abstract

While third generation wireless systems based on code division multiple access (CDMA) are beginning to see limited commercial deployments, orthogonal frequency division multiplexing (OFDM) is a leading candidate for fourth generation wireless multimedia systems. This seminar will briefly introduce the basic principles of OFDM and highlight some of the impairments that are typically encountered in OFDM systems. The remainder of the seminar will give an overview of our ongoing research on OFDM and multicarrier spread spectrum modulation. We will consider preamble design, time/frequency synchronization, and channel estimation for multiple-input multiple-output (MIMO) OFDM systems. Afterwards, two new signaling schemes will be introduced that use constant envelope multicarrier modulation to overcome the typical peak-to-average power ratio (PAPR) problem associated with OFDM. The first is a constant envelope waveform generated by combining OFDM with continuous phase modulation (CPM). The second is a constant envelope multicarrier spread spectrum waveform that is based on a complex quadratic sequence spreading sequence.

Biography

Gordon L. Stüber received the B.A.Sc. and Ph.D. degrees in Electrical Engineering from the University of Waterloo, Ontario, Canada, in 1982 and 1986, respectively. Since 1986, he has been with the School of Electrical and Computer Engineering, Georgia Institute of Technology, where he is currently the Joseph M. Pettit Chair Professor in Communications.

Dr. Stüber's research interests are in wireless communications and communication signal processing. He has over 160 refereed publications in books, journals and conferences in these areas. He was co-recipient of the Jack Neubauer Memorial Award for the best paper of the year published by the IEEE Vehicular Technology Society on the subject of Vehicular Technology Systems. He is author of the textbook "Principles of Mobile Communication", Kluwer Academic Publishers, 1996, 2001.

Dr. Stüber served as Technical Program Chair for the 1996 IEEE Vehicular Technology Conference (VTC'96), and Technical Program Chair for the 1998 IEEE International Conference on Communications, (ICC'98), General Chair of the Fifth IEEE Workshop on Multimedia, Multiaccess and Teletraffic for Wireless Communications (MMT'00), General Chair of the 2002 IEEE Communication Theory Workshop, and General Chair of the Fifth YRP International Symposium Wireless Personal Multimedia Communications (WPMC'02). He is a past Editor for Spread Spectrum with the IEEE Transactions on Communications (1993-1998). He is currently a member of the IEEE Communication Society Awards Committee, an elected member of the IEEE Vehicular Technology Society Board of Governors. He is a Fellow of the IEEE.

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