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Presenter: Dr. M. Oussama Damen - Research Associate, iCORE, University of Alberta, Edmonton, Alberta
Supervisor:

Date: Mon, May 6, 2002
Time: 14:30:00 - 15:30:00
Place: EOW 430

ABSTRACT

Abstract

The growing interest in space-time communications is due to the large theoretical potential of using multiple transmitter and receiver antennas over the wireless fading channel. After defining the problem in the multiple antennas system, and giving some key notes from the recent literature; I will develop a new approach to handle the coding and decoding problem over multi-antenna systems based on algebraic number theory. I will present a brief and comprehensive introduction to algebraically rotated constellations: history, underlying ideas, constructions, and some applications. Then, I present several space-time block codes which are constructed by the use of rotated constellations. The presented codes can be classified under two main categories; namely, the diagonal algebraic space-time (DAST) block codes which transmit at one symbol per channel use while achieving the maximum diversity over any number of transmit antennae M, and the full-rate algebraic space-time (FRAST) block codes, which has a rate of M symbols per channel use, and they achieve the maximum diversity; however, they are constructed by hand for some sporadic values of M. We discuss their properties, advantages, and disadvantages, where comparisons are done with space-time block codes from orthogonal design and linear dispersive codes. The performances of these codes are evaluated under different fading scenarios: quasi-static fading, fast fading, and correlated fading.

Biography

Mohamed Oussama Damen was born in Homs, Syria in 1971. He received a B.Sc. degree in mathematics from the University of Paris VII in 1995, an M.Sc. degree (with honors) in digital communications systems from the Ecole Nationale Superieure des Telecommunications (ENST) de Paris, France, in 1996 and a Ph.D. degree (Summa Cum Laude) in electronics and communications from the ENST, Paris, France, in October 1999. He has done post-doctoral research at the ENST, Paris, France, from November 1999 to August 2000, and at the Electrical and Computer Engineering department of the University of Minnesota from September 2000 to March 2001. In March 2001, he joined the Electrical and Computer Engineering department of the University of Alberta, where he is now working as a senior research associate of Alberta Informatics Circle of Research Excellence (iCORE). His research interests are in the areas of information theory, signal processing for wireless communications, space-time and multi-user communications, ISI channels, and performance analysis.

For Further Information Contact
Dr. N.J. Dimopoulos (721-8902)