【摘要】 高铁的迅速发展为现有的高铁无线通信系统带来了一些新的挑战.一个准确描述隧道信道特性的信道模型,对高铁通信系统的设计和评估意义重大.由于隧道狭长的空间、隧道本身的边界性以及产生的波导效应等,高铁隧道中的信道特性不同于其他的高铁场景.此外,隧道信道的一些特性目前还没有被充分地研究.因此,考虑大尺度和小尺度衰落特性的准确的隧道信道模型是十分必要和重要的.本文全面地综述了已开展的隧道信道测量及采用不同方法建模的隧道信道模型,讨论了未来高铁隧道信道测量及建模的一些研究方向.更多还原

【Abstract】 The rapid development of high-speed trains(HSTs) has introduced new challenges for HST wireless communication systems. Realistic HST channel models play a critical role in designing and evaluating HST communication systems. Because of length limitations,the bounds of tunnels,and waveguide effects,the channel characteristics in tunnel scenarios are very different from those in other HST scenarios. Therefore,accurate tunnel channel models that consider both large-scale and small-scale fading characteristics are essential for HST communication systems. Furthermore,certain characteristics of tunnel channels have not been investigated sufficiently.This article provides a comprehensive review of measurement systems for tunnels and presents tunnel channel models using various modeling methods. Finally,the future directions for HST tunnel channel measurement and modeling are discussed.更多还原