HOMEWORK II Ns2 Network Simulator Satellite Communications CS Wireless Communications & Networks Summer II 2003 Dr. Ajay Gupta Serhat Kucukomeroglu

2 PROGRAMING NETWORK (Ns2) Serhat KucukomerogluCS603 – SummerII 2003 GEO and Polar Satellites Polar S1 Polar S2 GEO

3 PROGRAMING NETWORK (Ns2) Serhat KucukomerogluCS603 – SummerII 2003 Geostationary and LEO Satellites Geostationary Satellites : -There is no problem with frequency change. -Tracking of satellites is easy. -It is cover roughly fourth of the earth. -The can get quite weak after km -The polar regions are poorly served bye GEO -Delay of sending signal significant. LEO Satellites : -Circular or slightly elliptical orbit under 2000 km -Orbit period is 1.5, 2 hours, coverage about 8000km. -Propagation delay is low -A received LEO signal is much stronger than GEO signal for the same transmission power. -For provide broad coverage over 24 hours, many satellites are needed

4 PROGRAMING NETWORK (Ns2) Serhat KucukomerogluCS603 – SummerII 2003

5 PROGRAMING NETWORK (Ns2) Serhat KucukomerogluCS603 – SummerII 2003 Questions