Analysis Of Mobile Satellite Channel Model And Design Of Satellite Communication Channel Simulator

Comparing with the fixed-line communication networks and the terrestrialwireless communication systems, the satellite mobile communication system has been a hot spot in the research field due to its wide coverage and convenience to provide the global service. Among kinds of satellite communication systems, the LEO satellite communication system has very wide prosperity because its orbit is low and it has less communication delay, less path loss and flexible network organization. In order to provide the LEO satellite communication system with good performance, the important issues need to do is to study the channel propagating characteristic and build feasible channel models. Meanwhile, the implementation of the channel simulator is so significant that it can provide a strong debug method for the system design and testing.Communication performance is affected by many factors during its transmission in the LEO satellite communication channel. This paper considers the multi-path fading and shadowing, Doppler frequency offset, noise and free space loss, and builds the channel models based on these considerations which are the theoretical basis of the design of LEO satellite mobile channel simulators. Detailed processes of derivations of the there probability distributions which are often used in studying the characteristics of satellite mobile channels are given in this paper. It contributes to the deeper comprehesion of these probability distributions, affords more detailed theoretical basis for further studying and simulating satellite mobile channels.Secondly, this paper gives a detail analysis for mobile communication channel model of low-orbit satellites. There commonly accepted channel model has been analyzed here, and their derivation is also given. This paper introduces a channel model with independent shadowing affecting each direct and diffuse component, respectively. Through simulation computation for these four mobile satellite channels, the validity of the simulation model and corresponding parameters put through in the paper has been verified. It can ensure the reliability and practicability of the hardware simulation of these models. The conclusions from this dissertation can be used to direct the hardware simulations of models so as to lower risks. In addition, the paper also analysis mobile satellite communication channel simulator, and gives its initial general design. This paper also explains the hardware implementation of Gaussian normal distribution, Rayleigh distribution and lognormal distribution, and analysis the sampling frequency and the design of Doppler frequency shift. All these will afford more detailed theoretical basis for further studying and simulating low-orbit satellite mobile channels simulator in the hardware platform.