Satellite Mobile Communication Channels And Performance Simulation

Mobile satellite communication system is a necessary part of next generation wireless communication system. Some of the key technologies such as channel model simulation, channel coding, interleaving and nonlinear effect studied in this paper, and current popular study in aviation-Aviation Mobile Satellite System has been analyzed, plus, its channel character and corresponding simulation model has been studied. Firstly, the paper has an overview of mobile satellite communication system, analyzes its character and the peculiarity compared with terrestrial wireless system. Design emphasis and difficulties of mobile satellite system has been widely analyzed. Has a brief introduction of the system channel character-time varying, multipath, shadowing and Doppler frequency. Secondly, typical channel models that have been widely accepted has been introduced, and their character analyzed; Thirdly, technologies such as channel coding and interleaving has been analyzed; Fourthly, has a brief overview of the nonlinear effect of the amplifier equipped in the satellite; At last, AMSS channel character has been analyzed, and the study emphasis been put forward. Generally speaking, this chapter deals with the analysis of current status of the world, and briefed the signification of the study of this paper. The way of colored Gaussian noise process has been put forward, and the optimum path in the simulation model been determined. Based on the Gaussian simulation, presents the simulation realization of other random processes that commonly used in channel simulation such as Rayleigh, Lognormal and Rice. The pdf resulted from the simulation model been compared with the theorization, results in verification of the validity of the simulation models. 3 commonly accepted channel model has been analyzed, New channel model at UHF presented based on C.Loo theory; The model parameters at different elevation angle provided, with polyfitting process, the equations for the parameters provided at elevation angle 15 ～80; Through simulation computation, first and second order of statistic-Cumulative density function, LCR and AFD achieved, plus, compared with the measured data, the validity of the simulation model and corresponding parameters put through in the paper has been verified. Mobile satellite system is power limited system, in order to enhance the capacity of the system, the link margin is always small, typically, about 10dB. However, when the communication terminal operates at small elevation angle, the attenuation of the signal...