卫星移动极化MIMO信道衰落特性模拟实现
发布时间：2019-01-03 20:58
【摘要】：卫星通信技术作为当今世上最先进的通信技术之一，卫星通信技术覆盖面积大、通信距离远的优点使其在各个领域发挥着举足轻重的作用。随着人们对更高通信传输速率的需求，卫星通信信道容量的需求也越来越高，MIMO技术因其能够提供分集增益和复用增益而在地面移动通信系统中成功的被广泛应用，使得越来越多的学者致力于探索将MIMO技术应用于卫星通信系统来满足人们的需求。对于星地链路一般情况下都有很强的直射特性并有一定的自由空间损耗，但是应用于地面移动通信系统的MIMO技术需要有丰富的反射、散射分量来保证MIMO子信道的不相关特性，因此对于卫星移动MIMO通信系统是否具有实用价值还处于理论研究阶段。由于在卫星上空间有限，在一颗卫星上安置普通的多根天线会导致信道相关性强而影响MIMO信道特性，所以在卫星通信系统中实现MIMO技术有两种方式：一种是单颗卫星极化MIMO系统，另一种是多颗卫星分布式MIMO系统，而多星系统由于时延因素不同步的问题比较严重，目前在单颗卫星上实现极化MIMO系统是最为可行的方案。 本文首先分析了课题背景，并着重分析在卫星移动通信中利用MIMO技术和卫星移动MIMO系统中信道建模的重要性，分别分析了当前窄带和宽带卫星移动MIMO信道建模、卫星移动MIMO信道模拟器的国内外的研究现状。然后分析了典型的卫星移动MIMO通信系统和卫星移动MIMO信道的统计特性和信道容量的理论。接下来利用SystemVue和Matlab仿真软件搭建了三种不同卫星环境下的窄带的卫星移动极化MIMO统计信道模型，建模过程包括卫星信道Loo模型、MIMO信道模型以及两状态马尔科夫信道状态转移模型，并利用仿真分析了各个子信道的时间序列、统计量以及对信道容量进行了计算以验证模型的正确性。之后深入分析了宽带卫星移动MIMO信道频率选择性衰落的原因，分别基于相位变化的多点散射和基于幅度变化的抽头延迟线建立了三种卫星环境下的宽带卫星移动极化MIMO信道模型，通过仿真结果验证模型信道特性的准确性并深入分析两种建模方法的可行性。最后利用N5106A PXB信道模拟器等硬件仪器设备，以抽头延迟线模型作为理论模型进行城市卫星环境下的宽带卫星移动极化MISO信道和宽带卫星移动极化MIMO信道的模拟实现，利用89601矢量信号设备分析了该环境下卫星与地面移动终端链路实时信道衰落对信号传输的影响。
[Abstract]:As one of the most advanced communication technologies in the world, satellite communication technology plays an important role in various fields because of its large coverage area and long communication distance. With the demand of higher transmission rate, the capacity of satellite communication channel is becoming more and more high. MIMO technology has been widely used in terrestrial mobile communication systems because of its ability to provide diversity gain and multiplexing gain. As a result, more and more scholars devote themselves to exploring the application of MIMO technology to satellite communication systems to meet the needs of people. Generally speaking, there is strong directness and free space loss for satellite-ground links, but the MIMO technology used in terrestrial mobile communication systems needs abundant reflection and scattering components to ensure the independent characteristics of MIMO subchannels. Therefore, whether the satellite mobile MIMO communication system has practical value is still in the theoretical research stage. Due to the limited space on a satellite, the placement of ordinary multiple antennas on a satellite will lead to strong channel correlation and affect the MIMO channel characteristics. So there are two ways to implement MIMO technology in satellite communication system: one is single satellite polarized MIMO system, the other is multi-satellite distributed MIMO system. At present, it is the most feasible scheme to realize polarimetric MIMO system on a single satellite. Firstly, this paper analyzes the background of the project, and analyzes the importance of using MIMO technology in satellite mobile communication and channel modeling in satellite mobile MIMO system, and analyzes the current channel modeling of narrowband and wideband satellite mobile MIMO, respectively. Research status of Satellite Mobile MIMO Channel Simulator at Home and abroad. Then the statistical characteristics and the theory of channel capacity of typical satellite mobile MIMO communication system and satellite mobile MIMO channel are analyzed. Then, using SystemVue and Matlab simulation software, three narrowband satellite mobile polarization MIMO statistical channel models under different satellite environments are built. The modeling process includes the satellite channel Loo model. MIMO channel model and two-state Markov channel state transition model are used to verify the correctness of the model. The time series, statistics and channel capacity of each sub-channel are analyzed by simulation. After that, the reasons of frequency selective fading of wideband satellite mobile MIMO channel are analyzed. The multi-point scattering based on phase change and the tap delay line based on amplitude change are used to establish the mobile polarization MIMO channel model of broadband satellite in three satellite environments. The simulation results verify the accuracy of the channel characteristics of the model and analyze the feasibility of the two modeling methods. Finally, by using the N5106A PXB channel simulator and other hardware instruments, the taps delay line model is used as the theoretical model to simulate the broadband satellite mobile polarized MISO channel and the broadband satellite mobile polarized MIMO channel under the urban satellite environment. The influence of real-time channel fading of satellite and ground mobile terminal link on signal transmission in this environment is analyzed by using 89601 vector signal equipment.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2
本文编号：2399862
[Abstract]:As one of the most advanced communication technologies in the world, satellite communication technology plays an important role in various fields because of its large coverage area and long communication distance. With the demand of higher transmission rate, the capacity of satellite communication channel is becoming more and more high. MIMO technology has been widely used in terrestrial mobile communication systems because of its ability to provide diversity gain and multiplexing gain. As a result, more and more scholars devote themselves to exploring the application of MIMO technology to satellite communication systems to meet the needs of people. Generally speaking, there is strong directness and free space loss for satellite-ground links, but the MIMO technology used in terrestrial mobile communication systems needs abundant reflection and scattering components to ensure the independent characteristics of MIMO subchannels. Therefore, whether the satellite mobile MIMO communication system has practical value is still in the theoretical research stage. Due to the limited space on a satellite, the placement of ordinary multiple antennas on a satellite will lead to strong channel correlation and affect the MIMO channel characteristics. So there are two ways to implement MIMO technology in satellite communication system: one is single satellite polarized MIMO system, the other is multi-satellite distributed MIMO system. At present, it is the most feasible scheme to realize polarimetric MIMO system on a single satellite. Firstly, this paper analyzes the background of the project, and analyzes the importance of using MIMO technology in satellite mobile communication and channel modeling in satellite mobile MIMO system, and analyzes the current channel modeling of narrowband and wideband satellite mobile MIMO, respectively. Research status of Satellite Mobile MIMO Channel Simulator at Home and abroad. Then the statistical characteristics and the theory of channel capacity of typical satellite mobile MIMO communication system and satellite mobile MIMO channel are analyzed. Then, using SystemVue and Matlab simulation software, three narrowband satellite mobile polarization MIMO statistical channel models under different satellite environments are built. The modeling process includes the satellite channel Loo model. MIMO channel model and two-state Markov channel state transition model are used to verify the correctness of the model. The time series, statistics and channel capacity of each sub-channel are analyzed by simulation. After that, the reasons of frequency selective fading of wideband satellite mobile MIMO channel are analyzed. The multi-point scattering based on phase change and the tap delay line based on amplitude change are used to establish the mobile polarization MIMO channel model of broadband satellite in three satellite environments. The simulation results verify the accuracy of the channel characteristics of the model and analyze the feasibility of the two modeling methods. Finally, by using the N5106A PXB channel simulator and other hardware instruments, the taps delay line model is used as the theoretical model to simulate the broadband satellite mobile polarized MISO channel and the broadband satellite mobile polarized MIMO channel under the urban satellite environment. The influence of real-time channel fading of satellite and ground mobile terminal link on signal transmission in this environment is analyzed by using 89601 vector signal equipment.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2
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