ACKNOWLEDGEMENTS
We would like to express our sincere gratitude to our
supervisor, Dr Felix AKORLI, for his invaluable support and
guidance throughout the duration of the research.
We appreciate the tremendous support provide from our parents,
brothers and sisters for their love and encouragement. We would not complete
our degrees without their continuous and immeasurable support.
We would like to acknowledge the support of several students
and staffs at National University of Rwanda; especially, we thank our
colleagues for their collaboration during our studies.
We also would like to thank the following people: Muragijimana
Emmanuel's family, Pastor Munezero's Family, Ntampaka Justin's family,
Ir.Nzamutuma Ismaël, Mr. Ndalibumbye Fidèle, Mr.Harerimana
Emmanuel, Pastor Nahayo David's family, Jyanumucyo choir, Mr. Semana Edmond,
Miss Nyiranteziryayo Grace and her family, Miss Icyimpaye Joyce and her sister
and others who helped us through the years of our studies in National
University of Rwanda.
Last but not the least to Miss Mutezinka Gloriose we
acknowledged her invaluable love and encouragement.
BUGINGO Philippe NDAMUKUNDA Ismaël
ABSTRACT
The purpose of this project is to carry out a study into the
use of smart antennae by mobile communication systems. An introduction which
gives an overview of the project is given. Two methods of antenna synthesis
known as the Woodward-Lawson and Dolph Chebyshev are
presented, of these methods Dolph Chebyshev was used in our design due to its
fast convegence. Antenna theory is discussed with emphasis on array antennas.
With a basic understanding on antenna, this project therefore discusses the
smart antenna by on mobile communication technology. The two types of smart
antenna design approaches known as the Switching-Beam Array and
Adaptive Array are addressed.In the design the Adaptive Array has been considered
since it has the advantage of high capacity property over the Switching Beam
Array. System aspect for a smart antenna technology is also given. After a
brief introduction to the types of multiple access schemes, array antennas
simulation and synthesis using the above mentioned methods is carried out by
varying different limiting parameters. Antenna radiation patterns are plotted
and discussed. It concludes that smart antennas systems are to be deployed in
mobile communication especially in heavily populated area where the number of
subscribers is large.
RESUME
Le but de ce projet est d'étudier la possibilité
d'utilisation d'antennes intelligentes par des systèmes de communication
mobiles. Une introduction qui contient une vue d'ensemble du projet est
donnée. Deux méthodes de synthèse d'antenne connue comme
Woodward-Lawson et Dolph Chebyshev sont
présentées, de ces methodes celle de Chebyshev a
été utilisé utilisée dans notre conception comme
elle est plus convergente. La théorie sur les antennes est
discutée en mettant l'accent sur les systèmes d'antennes.Avec une
compréhension de base sur les antennes, ce projet discute donc de la
technologie d'antenne intelligente sur la communication mobile. Les deux
approches d'antennes intelligentes connues comme Antennes à
commutation de faisceaux et antennes adaptives sont
adressés. Dans la conception, nous avons considéré les
antennes adaptives puisqu'elles offrent une plus grande capacité.
L'aspect d'un système d'antennes intelligentes est aussi donné.
Après une brève introduction aux différentes types
d'accès multiples, la simulation et la synthèse d' un
système d'antennes utilisant les méthodes ci haut
mentionnées sont effectuées, et cela, en variant des
paramètres de limitation différents. Les modèles de
radiation d'antenne sont tracés pour la discussion. La conclusion montre
que le systeme d'antennes intelligentes est recommandable pour être
utilisé dans les régions surpeuplées où le nombre
d'abonnées est très important.
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