This paper focuses on the propagation characterization of satellite communication systems in non-geostationary orbits at 900-2100MHz. An overview of available statistical propagation models for the mobile satellite communications channel is provided. Path loss equations for satellite communication systems in the range of 900-2100MHz for different environments and different probabilities of link closure are addressed. We also introduce a series of experiments being conducted to deepen

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... ng of these issues. A primary reason to address the lS and 2d order fading statistics is to provide estimates of the nature and the level of the signal impairments, so the bit error rate (BER), level cross rate (LCR) and average duration of fades(ADF) can be estimated on the basis of this distribution. A good model for such phenomena can help design good counter-measures such as better modulation, equalization, diversity, and channel coding to combat such fading impairments and to maintain communication between the satellite and the ground terminal receiver. Statistical models have been used to characterize various fading environments. 1 0-7803-5554-7/99/$10.00 0 IEEE. Authorized licensed use limited to: Southern Illinois University Carbondale. Downloaded on May 29, 2009 at 23:58 from IEEE Xplore. Restrictions apply. Conclusion: The propagation characterization in LEOME0 mobile satellite communication system is discussed in this paper. The existing research on statistical models of the received signal fading distribution were outlined. The path loss equations in LEO mobile satellite communication system were described. Finally, the experiments we are conducting were introduced.