高速移动下U型槽的时变信道建模

发布时间：2018-11-28 14:08

【摘要】：随着国内高速铁路建设的迅速发展,在高速铁路上要求移动办公、娱乐的客户需求与日俱增,而现有的蜂窝移动通信以及针对铁路的移动通信铁路全球系统(GSM-R)均不能很好地满足客户对宽带无线通信的服务质量(Qo S)需求。高铁在实际的行驶过程中,会经历各种复杂的场景,U型槽是常见的场景,然而目前尚未有充分针对高速移动下U型槽的时变信道建模的研究。针对此问题,提出一种高速移动下U型槽的时变信道建模方法。首先,采用几何随机分布理论,针对高铁典型场景U型槽建立几何分布模型,分析散射体簇的变化规律,推导视距(LOS)分布、时变角度扩展、时变多普勒扩展等参数的表达式,并给出了信道冲击响应的闭式解。其次,分析了信道的时变空时域互相关函数、时变自相关函数以及时变空域多普勒功率谱密度的表达式。最后,对所提模型进行了统计性能的仿真,验证了该模型具有时变性以及较高的相关性,体现了高铁信道的非平稳性,满足高速无线信道的特性。
[Abstract]:With the rapid development of high-speed railway construction in China, the demand for mobile office on high-speed railway is increasing, and the customer demand for entertainment is increasing day by day. However, the existing cellular mobile communication and the railway global system (GSM-R) for railway can not meet the (Qo S) requirement of broadband wireless communication. High-speed rail in the actual driving process will experience a variety of complex scenarios, U-slot is a common scenario, but there is no sufficient research on the time-varying channel modeling of U-slot under high-speed movement. In order to solve this problem, a time varying channel modeling method for U-slot with high speed moving is proposed. Firstly, geometric random distribution theory is used to establish a geometric distribution model for U-shaped slot in typical scene of high iron, to analyze the variation rule of scatterer cluster, to deduce the (LOS) distribution of line-of-sight, and to extend the time-varying angle. The expressions of parameters such as time-varying Doppler expansion are given, and the closed solution of channel impulse response is given. Secondly, the expressions of time-varying space-time cross-correlation function, time-varying autocorrelation function and time-varying spatial Doppler power spectral density are analyzed. Finally, the statistical performance of the proposed model is simulated, which verifies that the model is time-varying and highly correlated, which reflects the non-stationarity of high-speed rail channel and satisfies the characteristics of high-speed wireless channel.
【作者单位】：重庆大学通信与测控中心;综合业务网理论及关键技术国家重点实验室(西安电子科技大学);
【基金】：国家自然科学基金资助项目(61501066,61571069) 重庆市基础与前沿研究计划项目(cstc2015jcyj A40003) 中央高校基本科研业务费专项资金资助项目(106112017CDJXY500001,106112017CDJQJ168817) 西安电子科技大学综合业务网理论及关键技术国家重点实验室开放基金资助项目(ISN16-03)~~
【分类号】：TN929.5

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