Σχεδιασμός και υλοποίηση γεωμετρικού - στοχαστικού μοντέλου ραδιοδιαύλου για δορυφορικά συστήματα πολλαπλών εισόδων πολλαπλών εξόδων
This thesis describes the designing and implementation of three radiochannel models for multiple input-multiple output satellite systems. In the beginning, an analytical description of the theoretical model, which aims at the calculation of the space-time correlation between two random subchannels, is taking place. The application of the system is done with the use of the software Matlab. Afterwards, the methodology for the calculation of impulse responses is given.An analytical description of the calculation process for the correlation functions and the distance between the satellite and the scatterers follows. Next, the results from the execution of the developed Matlab programs for the reference model are presented. Then, a detailed description of the simulation models that are used in the analysis is provided. Afterwards, the simulation models of the system are presented. Firstly the stochastic, secondly the statistical and finally the deterministic. More specifically, the simulation results represent separately the temporal correlation and the correlation error difference between the theoretical and the rest of the models.