| Most studies have focused on multi input and multi output(MIMO) communication below the 10 GHz frequency band. In contrast the studies about MIMO Communications above 10 GHz frequency, such as KU-band and Ka-Band, is still in its infancy, and most of the studies is associated with multipath fading caused by ground environment and indoor environment. Millimeter-wave has a good penetration capability and it can obtain high resolution, especially in long distance communications. Also it has good security performance and wideband. Millimeter-wave MIMO system with many advantages has comprehensive prospects of application. But the ground-satellite millimeter-wave link at very low elevation status has little influenced by its topography, the atmospheric meteorological environment especially the troposphere atmosphere attenuation, scattering depolarization, additional noise has obvious effects on the link, so the study of atmospheric environment effected on the development of millimeter wave MIMO technology is particularly important.The main contents are as follows : This paper introduces the particle scattering and attenuation in rainfall environment : the scattering mechanism of single particle scattering and particle swarm; introduces the raindrop attenuation spectra, particle distribution theoretical models and engineering model, and introduces the delay spread, Doppler spread and angular spread of MIMO channel, and analyzes the key issues of the millimeter wave ground-satellite MIMO technology, And this paper studies correlation coefficient between transmitting antenna and receiving antenna respectively based on the channel fading coefficient models in rainfall environment of ground-satellite millimeter wave MIMO wireless communication system, this paper also studies the Doppler effect of the millimeter wave ground-satellite MIMO channel in rainfall environment, and simulates the correlation coefficient between the receiving antenna, the correlation coefficient between the transmitting antenna, channel Doppler power spectral respectively, and finally carries out a detailed analysis and discussion of the simulation results. The simulation results show: the first, the correlation coefficient between receiving antennas in rain is an function with rainfall rate, carrier frequency, half power beam width, and antenna spacing; the correlation coefficient between transmitting antennas in rain is an function with rainfall rate, carrier frequency, halfpower beam width, the height of the satellite from the ground and antenna spacing; the second, the Doppler shift is associated with rainfall rate, carrier frequency and other factors in rainfall environments. Under the same rain rate, different carrier frequencies have different Doppler spread. Under the same carrier frequency, the greater rainfall rate, the greater Doppler frequency spread.The analysis above reflect the time-varying characteristics of the channel correctly, and help us understanding and mastering the channel characteristics further as well as provide a reference for engineering practice. |
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