Simulation and Analysis of Satellite Mobile Systems

Satellite communications system uses various satellites to transmit radio signals between earth terminals. A typical operational link includes an active satellite and two or more earth terminals. Satellite communication is one of the significant factor from the space programs and has made a major contribution to the international communication. There are various types of information that can be transmitted through satellite, such as voice (telephone), video (television) and digital data. This paper gives modeling and simulation of satellite mobile systems using various tools such as Matlab, OPNET and Celplanner. Matlab results show that the losses don’t depend on a direction: from earth station to a satellite or vise verse. Moreover, power changes over the distance are identical for remote and for the central station. The OPNET simulated results show that changing in WAN protocols types don’t affect the performance of a network. Celplanner results show that the forward prediction has a better performance output then the reverse links. Decreasing the number of sites leads to performance and capacity changes. Also antenna high, antenna gain and power adjustments resulted better BER, less interferences and better reception. Key-Words: Satellite, Mobile, Simulation, Modelling, OPNET, Celplanner, Matlab.