Event Details
SISO Codes for MIMO Channels
Presenter: Dr. M. Oussama Damen - iCORE, Dept. of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta
Supervisor:
Date: Mon, February 10, 2003
Time: 14:30:00 - 15:30:00
Place: EOW 430
ABSTRACT
Abstract
Wireless channels are characterized by complex physical layer effects resulting from multitude of potentially mobile users communicating simultaneously in a multi-path fading environment. In such environments, reliable communication is made possible only through the use of diversity techniques in which the receiver is afforded multiple replicas of the transmitted signal under varying channel conditions. Antenna diversity techniques have recently received considerable attention due to the significant gains promised by information theoretic studies. While the use of multiple receive antennas is a well-explored problem, the design of space-time signals that exploit the available capacity in multi-transmit antenna systems still faces many challenges. A general framework for constructing multi-input multi-output (MIMO) space-time signals using single-input single-output (SISO) components is discussed in this talk. The combination of the threaded space-time architecture with algebraic number theoretic codes and constellations, or the threaded algebraic space-time (TAST) framework, is shown to be useful for constructing full rate, full diversity, and polynomial complexity space-time constellations for systems with arbitrary numbers of transmit and receive antennas, for scenarios where the channel state information (CSI) is known a-priori at the transmitter and receiver (TR-CSI), receiver only (R-CSI), and neither one of them (N-CSI). In addition, the TAST framework subsumes many of the existing space-time signaling schemes as special cases. Furthermore, the fundamental tradeoff between rate and diversity is examined under different constraints on the peak power, receiver complexity, and rate scaling with the signal-to-noise ratio. The talk will be concluded with a brief overview of possible avenues for future research.
For Further Information Contact
Dr. N.J. Dimopoulos (721-8902)