Julkaisu 532
Publication 532
Sassan Iraji
Novel Signal Processing Techniques for Advanced Wireless Communications
Tampere 2005
Tampereen teknillinen yliopisto. Julkaisu 532 Tampere University of Technology. Publication 532
Sassan Iraji
Novel Signal Processing Techniques for Advanced Wireless Communications
Thesis for the degree of Doctor of Technology to be presented with due permission for public examination and criticism in Tietotalo Building, Auditorium TB109, at Tampere University of Technology, on the 6th of May 2005, at 12 noon.
Tampereen teknillinen yliopisto - Tampere University of Technology Tampere 2005
ISBN 952-15-1349-7 (printed) ISBN 952-15-1822-7 (PDF) ISSN 1459-2045
TAMPERE UNIVERSITY OF TECHNOLOGY
Date: April 2005 Author: Title: Sassan Iraji Novel Signal Processing Techniques for Advanced Wireless Communications Department: Department of Information Technology Degree: DTech Convocation: May Year: 2005
Permission is herewith granted to Tampere University of Technology to circulate and to have copied for non-commercial purposes, at its discretion, the above title upon the request of individuals or institutions.
Sassan Iraji
THE AUTHOR RESERVES OTHER PUBLICATION RIGHTS, AND NEITHER THE THESIS NOR EXTENSIVE EXTRACTS FROM IT MAY BE PRINTED OR OTHERWISE REPRODUCED WITHOUT THE AUTHOR'S WRITTEN PERMISSION.
c Copyright by Sassan Iraji, 2005
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To Hanna and Darius with all my love and to the memory of my parents
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Abstract
There is a high demand to increase the data rate and quality of current wireless communication systems. Therefore, techniques that can increase the data rate, improve the spectral eciency and enhance the performance of wireless communication systems are of great interest. One way to meet the above challenges is to exploit multiple transmit and receive antennas and in particular space-time processing techniques. These concepts have been recently proposed and extensively investigated. Nevertheless, designing space-time codes for multiple fading channels remains a big challenge. The rst part of this thesis deals briey with the multiple-antenna concept, in general, and the space-time processing techniques, in particular. Specically, we focus on the design of space-time block codes for a multipath fading channel. Previous work has concentrated on the design of orthogonal space-time block codes. We propose a non-orthogonal space-time block code for multipath fading channels. Our design is based upon the upper bounds of the average pairwise error probability. It is shown that this non-orthogonal space-time block code takes advantage of the diversity provided by a multipath channel. Another way to increase the performance of a cellular wireless communication system is to implement multiuser detection. In the second part of this work, we have designed an interference canceller. This is based on the expectation-maximization (EM) algorithm for the space-time block coded WCDMA system, which is the airinterface of the currently being deployed 3G system, over a multipath fading channel. vii

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