降雨環(huán)境下毫米波地空MIMO信道若干特性研究
發(fā)布時間：2019-05-31 19:35
【摘要】：絕大多數(shù)關(guān)于MIMO通信的研究都集中在了10GHz頻率以下的頻段。與此形成對比的是,對10GHz以上頻段,比如Ku頻段,Ka頻段的MIMO通信研究則仍然處在起步階段,涉及到的也主要是地面和室內(nèi)環(huán)境造成的多徑衰減。毫米波MIMO系統(tǒng)具有諸多優(yōu)點,有著廣闊的應(yīng)用前景。但對于毫米波地空鏈路,除非在極低仰角工作狀態(tài)下,鏈路受地形、地地貌的影響很小,受到大氣氣象環(huán)境的影響卻十分明顯,尤其是對流層大氣環(huán)境中產(chǎn)生衰減、散射、去極化、附加噪聲等,所以研究大氣環(huán)境對發(fā)展毫米波段MIMO技術(shù)就顯得尤為重要。本文主要內(nèi)容如下:本文首先介紹了降雨環(huán)境中粒子散射與衰減作用:單粒子散射與群里子散射作用機理,分別介紹了雨滴粒子分布譜以及降雨衰減理論和工程模型;分析了不同雨滴譜的降雨衰減特性;其次介紹了MIMO通信系統(tǒng)基本模型以及信道模型分類;分別介紹了MIMO信道時延擴展,多普勒擴展和角度擴展;并分析了毫米波地空MIMO技術(shù)中的關(guān)鍵問題;最后基于本文所構(gòu)建的信道衰落系數(shù)模型,分別研究了降雨環(huán)境下毫米波地-空MIMO無線通信系統(tǒng)接收、發(fā)射天線相關(guān)系數(shù),研究了降雨環(huán)境下毫米波地-空MIMO信道多普勒效應(yīng),并分別對接收天線間相關(guān)系數(shù),發(fā)射天線間相關(guān)系數(shù),信道多普勒功率譜進行了仿真,最后對其仿真結(jié)果進行了詳細的分析討論。其仿真結(jié)果表明,第一,降雨環(huán)境中接收天線間相關(guān)系數(shù)在一定條件下是天線間距離、載波頻率、半功率波束寬度的函數(shù),發(fā)射天線間相關(guān)系數(shù)在一定條件下是天線間距離、降雨率、衛(wèi)星距離地面高度、載波頻率的函數(shù);第二,降雨環(huán)境下信道多普勒頻移與降雨率,載頻等因素相關(guān)。相同降雨率下,不同的載波頻率有著不同的多普勒擴展。在相同載波頻率下,降雨率越大頻率擴展也越大。以上分析正確反映了信道的時變特性,有助于對信道的進一步理解和掌握以及為工程實踐提供一定的借鑒。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3;P49
本文編號：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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3;P49
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