降雨环境下毫米波地空MIMO信道若干特性研究
发布时间：2019-05-31 19:35
【摘要】：绝大多数关于MIMO通信的研究都集中在了10GHz频率以下的频段。与此形成对比的是,对10GHz以上频段,比如Ku频段,Ka频段的MIMO通信研究则仍然处在起步阶段,涉及到的也主要是地面和室内环境造成的多径衰减。毫米波MIMO系统具有诸多优点,有着广阔的应用前景。但对于毫米波地空链路,除非在极低仰角工作状态下,链路受地形、地地貌的影响很小,受到大气气象环境的影响却十分明显,尤其是对流层大气环境中产生衰减、散射、去极化、附加噪声等,所以研究大气环境对发展毫米波段MIMO技术就显得尤为重要。本文主要内容如下:本文首先介绍了降雨环境中粒子散射与衰减作用:单粒子散射与群里子散射作用机理,分别介绍了雨滴粒子分布谱以及降雨衰减理论和工程模型;分析了不同雨滴谱的降雨衰减特性;其次介绍了MIMO通信系统基本模型以及信道模型分类;分别介绍了MIMO信道时延扩展,多普勒扩展和角度扩展;并分析了毫米波地空MIMO技术中的关键问题;最后基于本文所构建的信道衰落系数模型,分别研究了降雨环境下毫米波地-空MIMO无线通信系统接收、发射天线相关系数,研究了降雨环境下毫米波地-空MIMO信道多普勒效应,并分别对接收天线间相关系数,发射天线间相关系数,信道多普勒功率谱进行了仿真,最后对其仿真结果进行了详细的分析讨论。其仿真结果表明,第一,降雨环境中接收天线间相关系数在一定条件下是天线间距离、载波频率、半功率波束宽度的函数,发射天线间相关系数在一定条件下是天线间距离、降雨率、卫星距离地面高度、载波频率的函数;第二,降雨环境下信道多普勒频移与降雨率,载频等因素相关。相同降雨率下,不同的载波频率有着不同的多普勒扩展。在相同载波频率下,降雨率越大频率扩展也越大。以上分析正确反映了信道的时变特性,有助于对信道的进一步理解和掌握以及为工程实践提供一定的借鉴。
[Abstract]:Most of the research on MIMO communication focuses on the frequency band below 10GHz frequency. In contrast, the research on MIMO communication in the above 10GHz band, such as Ku band and Ka band, is still in its infancy, which is mainly related to the multi-path attenuation caused by the ground and indoor environment. Millimeter wave MIMO system has many advantages and has broad application prospects. However, for millimeter wave ground-to-air links, unless the link is affected by topography and geomorphology at a very low elevation angle, it is obviously affected by the atmospheric meteorological environment, especially in the tropospheric atmosphere. Depolarization, additional noise and so on, so the study of atmospheric environment is particularly important for the development of millimeter band MIMO technology. The main contents of this paper are as follows: firstly, the mechanism of particle scattering and attenuation in rainfall environment is introduced, and the distribution spectrum of raindrop particles, the theory and engineering model of rainfall attenuation are introduced respectively. The rainfall attenuation characteristics of different raindrop spectra are analyzed. Secondly, the basic model of MIMO communication system and the classification of channel models are introduced, and the channel delay spread, Doppler spread and angle spread of MIMO channel are introduced respectively. The key problems in millimeter wave ground-to-air MIMO technology are analyzed. Finally, based on the channel fading coefficient model constructed in this paper, the reception and transmit antenna correlation coefficients of millimeter wave ground-to-air MIMO wireless communication system in rainfall environment are studied, and the Doppler effect of millimeter wave ground-to-air MIMO channel in rainfall environment is studied. The correlation coefficients between receiving antennas, transmit antennas and channel Doppler power spectrum are simulated respectively. finally, the simulation results are analyzed and discussed in detail. The simulation results show that: first, under certain conditions, the correlation coefficient between receiving antennas is a function of the distance between antennas, carrier frequency and half power beam width, and the correlation coefficient between transmitting antennas is the distance between antennas under certain conditions. Rain rate, satellite height to the ground, carrier frequency function; Second, the channel Doppler frequency shift is related to rainfall rate, carrier frequency and other factors in rainfall environment. Under the same rain rate, different carrier frequencies have different Doppler spread. At the same carrier frequency, the larger the rain rate, the greater the frequency spread. The above analysis correctly reflects the time-varying characteristics of the channel, which is helpful to the further understanding and mastery of the channel and to provide some reference for engineering practice.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3;P49
本文编号：2489968
[Abstract]:Most of the research on MIMO communication focuses on the frequency band below 10GHz frequency. In contrast, the research on MIMO communication in the above 10GHz band, such as Ku band and Ka band, is still in its infancy, which is mainly related to the multi-path attenuation caused by the ground and indoor environment. Millimeter wave MIMO system has many advantages and has broad application prospects. However, for millimeter wave ground-to-air links, unless the link is affected by topography and geomorphology at a very low elevation angle, it is obviously affected by the atmospheric meteorological environment, especially in the tropospheric atmosphere. Depolarization, additional noise and so on, so the study of atmospheric environment is particularly important for the development of millimeter band MIMO technology. The main contents of this paper are as follows: firstly, the mechanism of particle scattering and attenuation in rainfall environment is introduced, and the distribution spectrum of raindrop particles, the theory and engineering model of rainfall attenuation are introduced respectively. The rainfall attenuation characteristics of different raindrop spectra are analyzed. Secondly, the basic model of MIMO communication system and the classification of channel models are introduced, and the channel delay spread, Doppler spread and angle spread of MIMO channel are introduced respectively. The key problems in millimeter wave ground-to-air MIMO technology are analyzed. Finally, based on the channel fading coefficient model constructed in this paper, the reception and transmit antenna correlation coefficients of millimeter wave ground-to-air MIMO wireless communication system in rainfall environment are studied, and the Doppler effect of millimeter wave ground-to-air MIMO channel in rainfall environment is studied. The correlation coefficients between receiving antennas, transmit antennas and channel Doppler power spectrum are simulated respectively. finally, the simulation results are analyzed and discussed in detail. The simulation results show that: first, under certain conditions, the correlation coefficient between receiving antennas is a function of the distance between antennas, carrier frequency and half power beam width, and the correlation coefficient between transmitting antennas is the distance between antennas under certain conditions. Rain rate, satellite height to the ground, carrier frequency function; Second, the channel Doppler frequency shift is related to rainfall rate, carrier frequency and other factors in rainfall environment. Under the same rain rate, different carrier frequencies have different Doppler spread. At the same carrier frequency, the larger the rain rate, the greater the frequency spread. The above analysis correctly reflects the time-varying characteristics of the channel, which is helpful to the further understanding and mastery of the channel and to provide some reference for engineering practice.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.3;P49
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1 徐娜;MIMO系统分集复用折衷的研究[D];大连理工大学;2008年
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