Influence Analysis of Typical Objects in Rural Railway Environments at 28 GHz
Influence Analysis of Typical Objects in Rural Railway Environments at 28 GHz
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28 GHz乡村铁路环境典型物体影响分析
DOI：
10.1109/tvt.2018.2840097
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发表时间：
2019-03-01
影响因子：
6.8
通讯作者：
Hao, Yang
中科院分区：
文献类型：
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作者：
He, Danping;Ai, Bo;Hao, Yang
毫米波（mmWave）是实现高数据速率通信和实现智能铁路服务的关键。毫米波铁路通信的算法和系统设计是铁路通信领域的研究热点。正确理解铁路场景的毫米波信道特性对于估计和评估所设计的技术非常重要。分析了农村铁路环境中典型目标对毫米波传播信道的影响。基于在农村铁路环境中进行的28 GHz列车到基础设施部署的信道测量，在环境建模和电磁（EM）计算方面校准射线跟踪（RT）模拟器。测量的主要多径分量被跟踪并与传播环境中的相应对象相匹配。因此，主要的传播机制（直接、穿透、反射、散射等）确定了三维环境模型和不同目标的电磁参数。为了克服测量的限制和分析的影响更实际，测量活动扩展到四个不同的环境情况下，四个T2I部署。利用预定的主导传播机制和校准的EM参数，进行可靠的RT模拟。针对所考虑的环境案例和部署，分析了典型对象的影响。本文的分析不仅有助于从目标层面理解影响毫米波传播信道的重要因素，而且对毫米波通信系统的部署具有一定的指导意义。所提供的EM参数和环境建模建议将使农村铁路环境中可靠的基于RT的信道实现成为可能。
Millimeter wave (mmWave) is a key to realize high data-rate communication and enable smart railway services. There are more and more research work focusing on the algorithm and system design for railway communications in the mmWave band. A correct understanding of the mmWave channel characteristics for railway scenario is important for the estimation and evaluation of designed technologies. In this paper, the influence of typical objects in rural railway environment to the mmWave propagation channel is analyzed. Based on the channel measurement conducted at 28 GHz with train-to-infrastructure deployment in the rural railway environment, a ray tracing (RT) simulator is calibrated in terms of environment modeling and electromagnetic (EM) calculation. The dominant multipath components of the measurement are tracked and matched with corresponding objects in the propagation environment. Accordingly, dominant propagation mechanisms (direct, penetration, reflection, scattering, etc.) are determined, the three-dimensional environment model and the EM parameters of different objects are calibrated. To overcome the constraints of the measurement and analyze the influence more practically, the measurement campaign is extended to four different environment cases and four T2I deployments. With the predetermined dominant propagation mechanisms and calibrated EM parameters, reliable RT simulations are conducted. The influence of typical objects are analyzed for the considered environment cases and deployments. The analysis of this paper not only helps to understand the important influential factors of propagation channel at the object level, but also can be useful in guiding deployment of mmWave communication system. The provided EM parameters and environment modeling suggestions will enable reliable RT based channel realization in rural railway environments.