Massive MIMO确定性建模中的Ray Tracing技术研究
发布时间：2018-07-28 11:02
【摘要】：大规模MIMO (Massive Multiple-Input Multiple-Output)技术正极大地推动着下一代移动通信5G (Fifth-generation)的发展,其能大幅度提升通信容量,以达到5G移动通信系统超高增益的目标。在Massive MIMO系统中,多用户同时使用基站侧配备的大量(数十或数百根)天线。理论和测量结果均表明,Massive MIMO可以在不增加带宽或传输功率的情况下,显著提高频谱效率、降低辐射功率。信道模型作为评价任何通信系统性能的第一步,建立准确且有效的Massive MIMO信道模型来对通信系统进行系统设计和性能评估是不可或缺的。 因此,精确Massive MIMO信道模型的构建以及天线阵列的配置,成为研究Massive MIMO信道特性的关键。在这一研究背景下,本文探索了确定性信道建模中基于电磁理论和几何光学理论的射线追踪技术,所做的工作包括： 1.基于所需建模场景的具体几何结构信息、地理位置信息以及表面材料的相关介电常数和磁导率,将三维建筑物简化为由多个矩形平面构成的结构体,并按照逆时针方向储存各平面顶点信息,根据实际的场景信息设定结构体的高度和位置,搭建出北京交通大学主校区机械工程楼和土木工程楼的场景模型,建立了Massive MIMO无线信道仿真平台。 2.设计了最大数目为128根呈线性、圆形排列的天线阵列,并通过放置位置的不同,构建了视距LOS(Line of Sight)和非视距NLOS(Non-line of Sight)两个场景,可用于理论分析对比不同天线阵列、不同场景下Massive MIMO无线信道特征。 3.实现了根据所搭建的场景信息和所构建的天线阵列信息,通过电磁计算,用射线来描述从发射端到接收端的包括直射径、反射径和散射径的所有传播路径,得到多径的复数形式的电场强度、时间延迟以及到达角和离开角等信道参数。提出了基于大规模天线阵列的信道参数分析方法,该方法可用来探索Massive MIMO信道特征和传播特性,为5G大规模天线阵列信道实际应用提供有效的理论支撑。
[Abstract]:Large-scale MIMO (Massive Multiple-Input Multiple-Output) technology is greatly promoting the development of the next generation mobile communication 5G (Fifth-generation), which can greatly enhance the communication capacity, in order to achieve the goal of 5G mobile communication system ultra-high gain. In Massive MIMO systems, multiple users use a large number of antennas (dozens or hundreds) on the base side at the same time. Both theoretical and measurement results show that passive MIMO can significantly improve spectral efficiency and reduce radiation power without increasing bandwidth or transmission power. As the first step to evaluate the performance of any communication system, it is necessary to establish an accurate and effective Massive MIMO channel model to design and evaluate the performance of the communication system. Therefore, the construction of accurate Massive MIMO channel model and the configuration of antenna array become the key to study the characteristics of Massive MIMO channel. Under this background, the ray tracing technology based on electromagnetic theory and geometric optics theory in deterministic channel modeling is explored. The work is as follows: 1. Based on the specific geometric structure information, geographical position information and the permittivity and permeability of the surface material, the three-dimensional building is simplified into a structure composed of several rectangular planes. According to the counterclockwise storage of the vertex information of each plane, the height and location of the structure are set up according to the actual scene information, and the scene models of mechanical engineering building and civil engineering building in the main campus of Beijing Jiaotong University are built. The Massive MIMO wireless channel simulation platform is established. 2. In this paper, a maximum number of 128-linear, circular array antennas are designed, and two scenes of LOS (Line of Sight) and Non-line of Sight) (Non-line of Sight) are constructed, which can be used for theoretical analysis and comparison of different antenna arrays. Massive MIMO wireless channel characteristics in different scenarios. 3. According to the scene information and antenna array information, all propagation paths from emitter to receiver are described by means of electromagnetic calculation, including direct emission path, reflection path and scattering path. The multipath complex form of electric field intensity, time delay and channel parameters such as arrival angle and departure angle are obtained. A channel parameter analysis method based on large scale antenna array is proposed. This method can be used to explore the channel characteristics and propagation characteristics of Massive MIMO and provide an effective theoretical support for the practical application of 5G antenna array channel.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5
本文编号：2149909
[Abstract]:Large-scale MIMO (Massive Multiple-Input Multiple-Output) technology is greatly promoting the development of the next generation mobile communication 5G (Fifth-generation), which can greatly enhance the communication capacity, in order to achieve the goal of 5G mobile communication system ultra-high gain. In Massive MIMO systems, multiple users use a large number of antennas (dozens or hundreds) on the base side at the same time. Both theoretical and measurement results show that passive MIMO can significantly improve spectral efficiency and reduce radiation power without increasing bandwidth or transmission power. As the first step to evaluate the performance of any communication system, it is necessary to establish an accurate and effective Massive MIMO channel model to design and evaluate the performance of the communication system. Therefore, the construction of accurate Massive MIMO channel model and the configuration of antenna array become the key to study the characteristics of Massive MIMO channel. Under this background, the ray tracing technology based on electromagnetic theory and geometric optics theory in deterministic channel modeling is explored. The work is as follows: 1. Based on the specific geometric structure information, geographical position information and the permittivity and permeability of the surface material, the three-dimensional building is simplified into a structure composed of several rectangular planes. According to the counterclockwise storage of the vertex information of each plane, the height and location of the structure are set up according to the actual scene information, and the scene models of mechanical engineering building and civil engineering building in the main campus of Beijing Jiaotong University are built. The Massive MIMO wireless channel simulation platform is established. 2. In this paper, a maximum number of 128-linear, circular array antennas are designed, and two scenes of LOS (Line of Sight) and Non-line of Sight) (Non-line of Sight) are constructed, which can be used for theoretical analysis and comparison of different antenna arrays. Massive MIMO wireless channel characteristics in different scenarios. 3. According to the scene information and antenna array information, all propagation paths from emitter to receiver are described by means of electromagnetic calculation, including direct emission path, reflection path and scattering path. The multipath complex form of electric field intensity, time delay and channel parameters such as arrival angle and departure angle are obtained. A channel parameter analysis method based on large scale antenna array is proposed. This method can be used to explore the channel characteristics and propagation characteristics of Massive MIMO and provide an effective theoretical support for the practical application of 5G antenna array channel.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5
【参考文献】
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