To my Late brother

First of all I would like to thank my supervising tutor Prof. Lars Kildehöj Rasmussen at KTH for his abundant help and prolific suggestions. He made himself readily available, had a patient ear, and always took the time to answer my questions thoroughly sometimes not related to thesis. My deep appreciation and heartfelt gratitude also goes to my thesis supervisor at LTH, Fredrik Tufvesson for his support, patience and guidance. Both of my supervisors also reviewed the whole thesis report very carefully for even the delicate specifics for which I am very thankful to them. My special thanks go to Professor Mikael Skoglund for allowing me to do my master thesis in communication Theory department KTH. The atmosphere has always been a perfect source of motivation. My stay at communication theory department was so nice that I included the possibility to work in this department in my future plans. I have to mention nice time out and discussions with communication theory department staff. I would also like to thank Johannes Karlsson for his devotion to simulator computers which made the simulation so flexible and extendible for me