I would like to express my sincere thanks to my warehouse, sawat
phongsuk for her invaluable help and constant encouragement throughout the course
of this Study. I am most grateful for her teaching and advice, not only the Study
methodologies but also many other methodologies in life. I would not have achieved
this far and this Study would not have been completed without all the support that I
have always received from her. In addition, I am grateful for the teachers of telecommunication engineering:
Asst.
and all their help. Finally, I most gratefully acknowledge my parents and my friends for all their
support throughout the period of this Study.