الفهرس 
History of Mobile Cellular SystemsOnly 14 pages are availabe for public view
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Abstract
This thesis is concerned with Channel Modeling for UMTS System in
order to enhance and improve its performance in data transfer. The
main objective of this thesis is to search for methods of channel
models proper for simulation to be used in UMT systems when
investigating the effect of different parameters that affect its
performance and in the same time reduces the simulation time.
The thesis starts with a summary on the history of mobile
communications starting from first generation and ending with 3G.
This thesis focuses on UMTS where a good study is presented on
UMTS concerning its frequency spectrum, ystem Architecture,
Handover, Transport, Logical and physical channels.
Also duplex techniques, Modulation techniques. Multiple access and
power control in UMTS is also presented.
As this thesis is mainJy concerned with Channel models so a good
study is presented starting from physical phenomena that affects any
mobile communications channel model and ending at presenting
many mobile communications models whether statistical or
deterministic.
A deep study is done on Independent Rayleigh Faders Model used in
simulation trying to improve its performance from many points of
view such as accuracy, simulation time and complexity.
A brief study is done on Gans Fading Model and finally a small
comparison between Rayleigh Independent Faders Model and Gans
Fading Model is presented.
An approximated model to that of Independent Rayleigh Faders
Model which is called Triangular Model is also studied and a new
proposed model which is called Approximated Piecewise Linear
Model is also presented. And at the end a comparison is held
This thesis is concerned with Channel Modeling for UMTS System in
order to enhance and improve its performance in data transfer. The
main objective of this thesis is to search for methods of channel
models proper for simulation to be used in UMT systems when
investigating the effect of different parameters that affect its
performance and in the same time reduces the simulation time.
The thesis starts with a summary on the history of mobile
communications starting from first generation and ending with 3G.
This thesis focuses on UMTS where a good study is presented on
UMTS concerning its frequency spectrum, ystem Architecture,
Handover, Transport, Logical and physical channels.
Also duplex techniques, Modulation techniques. Multiple access and
power control in UMTS is also presented.
As this thesis is mainJy concerned with Channel models so a good
study is presented starting from physical phenomena that affects any
mobile communications channel model and ending at presenting
many mobile communications models whether statistical or
deterministic.
A deep study is done on Independent Rayleigh Faders Model used in
simulation trying to improve its performance from many points of
view such as accuracy, simulation time and complexity.
A brief study is done on Gans Fading Model and finally a small
comparison between Rayleigh Independent Faders Model and Gans
Fading Model is presented.
An approximated model to that of Independent Rayleigh Faders
Model which is called Triangular Model is also studied and a new
proposed model which is called Approximated Piecewise Linear
Model is also presented. And at the end a comparison is held