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Presenter: Dr. Benjamin Ng - Dept. of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario
Supervisor:

Date: Wed, February 26, 2003
Time: 14:30:00 - 15:30:00
Place: EOW 430

ABSTRACT

Abstract

Recently, the class of new technologies based on multiple-input-multiple-output (MIMO) system has emerged as a major breakthrough in wireless communications. MIMO is used to describe a wireless system that utilizes multiple antennas at both the transmitter and the receiver. The first part of this seminar will present an introductory overview of recent work in this area. Then, the second part will discuss some new results based on a new perspective in MIMO: space- time multiple access. With this perspective, multiuser optimization will substitute the single-user optimization (the main focus in previous work), as the main objective. As a result, a new multiple access scheme, called the spread space-spectrum multiple access (SSSMA), is developed for the forward link. It is shown that the unique advantage of spreading in both space and time may potentially bring about significant improvement over other similar MIMO schemes. For the reverse link, a new multiuser-space-time-coding design framework is developed. It is shown that in this new framework, single-user performance can be achieved in a multiuser environment by using the proposed interference-resistant modulation (IRM) scheme.

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