Wireless channel modeling is regarded as a pivotal research topic, since the analysis and evaluation of the wireless communication system requires a reliable model of the channel impulse response (CIR). This paper presents a novel and practical study on the position-based radio propagation channel for high-speed vactrains in the vacuum tube scenarios using the propagation graph channel modeling theory. Based on the Lambertian scattering pattern, the propagation graph channel modeling method considers the diffusion effect of radio waves. A multiple-input multiple-output (MIMO) wideband system channel is emulated for obtaining the virtual channel data. During the emulation process, the line-of-sight (LoS), single-bounced and double-bounced components are considered to yield the virtual CIR. Then, small-scale fading properties such as K factor, time delay spread (DS), and Doppler frequency feature are parameterized particularly, which presents dynamic variances at different train locations. Moreover, the simulation performance analysis of the MIMO system focuses on the ergodic capacity and the singular value spread (SVS). The corresponding results indicate a MIMO capacity performance degradation in this scenario. The proposed model can facilitate the reliable simulation and evaluation of MIMO systems for the high-speed vactrains in the vacuum tube scenarios.

中文翻译：

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使用传播图建模理论对真空管场景中的高速 Vactrain 进行基于位置的无线信道表征

无线信道建模被认为是一个关键的研究课题，因为无线通信系统的分析和评估需要一个可靠的信道脉冲响应 (CIR) 模型。本文使用传播图信道建模理论，对真空管场景中高速真空列车的基于位置的无线电传播信道进行了新颖而实用的研究。基于朗伯散射模式的传播图信道建模方法考虑了无线电波的扩散效应。模拟多输入多输出(MIMO)宽带系统信道以获得虚拟信道数据。在仿真过程中，视距 (LoS)、单弹跳和双弹跳分量被视为产生虚拟 CIR。然后，小尺度衰落属性，如 K 因子，时延扩展（DS）和多普勒频率特征被特别参数化，在不同的列车位置呈现动态变化。此外，MIMO系统的仿真性能分析侧重于遍历容量和奇异值扩展（SVS）。相应的结果表明在这种情况下 MIMO 容量性能下降。所提出的模型有助于在真空管场景中对高速真空列车的 MIMO 系统进行可靠的仿真和评估。相应的结果表明在这种情况下 MIMO 容量性能下降。所提出的模型有助于在真空管场景中对高速真空列车的 MIMO 系统进行可靠的仿真和评估。相应的结果表明在这种情况下 MIMO 容量性能下降。所提出的模型有助于在真空管场景中对高速真空列车的 MIMO 系统进行可靠的仿真和评估。