Mobile Satellite Communication Channel Model Research And Baseband Simulation To Achieve

Satellite mobile communication system has become one of the hot communication research fields and a useful tool for modern communication. During the work of studying, planning and designing modern mobile communication systems which are based on satellites, the study of propagation characteristics of the satellite mobile channel is one of the most important factors. In this dissertation, on the basis of theoretical analyses of the probabilistically distributed models of satellite mobile channels, we give the detailed processes of the software simulation of Lutz model. In order to approximate the characteristics of the real satellite mobile channels as well as possible and in order to lower risks in the hardware simulation of the models, firstly, we do the work of theoretical analyses and software simulations ; secondly we compare the data from the theoretical formula and computer simulations with the measured data; finally we apply the conclusions to the hardware simulation of Lutz model. The main content in this dissertation includes:·detailed processes of derivations of the there probability distributions which are often used in studying the characteristics of satellite mobile channels are given. It contributes to the deeper comprehesion of these probability distributions , affords more detailed theoretical basis for further studying and simulating satellite mobile channels,· theoretical analyses and discussions of the models which are often used in the study of the propagating characteristics of satallite mobile channels are given; meantime, some discussions on the work of model simulations are also given,·incorrect derivation of the equality between C.Loo model and Corazza model in some other papers is pointed out . Via the conception of received power, we derivate that in the rural environments these two models really have the equal relationship by the way of theoretical derivation and simulatant fittings. Therefore, it is able to use Corazza model in studying the characteristics of satellite mobile channels in the rural environments and able to avoid the iterant work of modeling ,in order to enhance the efficiency and accuracy of research work,· detailed processes of simulating Lutz model by using MATLAB6.0_Simulink4.0 and the results of comparisions are given. It can ensure the reliability and practicability of the hardware simulation of Lutz model . The conclusions from this dissertation can be used to direct the hardware simulations of models so as to lower risks .