Measurement-Based Delay and Doppler Characterizations for High-Speed Railway Hilly Scenario

Abstract

This paper presents results for delay and Doppler spread characterization in high-speed railway (HSR) hilly scenario. To investigate the propagation characteristics in this specific terrain, a measurement campaign is conducted along the "Guangzhou-Shenzhen" HSR in China. A wideband channel sounder with 40 MHz bandwidth is used to collect raw data at 2.4 GHz band. The delay spread and Doppler frequency features are analyzed based on measured data. It is found that there are abundant multipath components (MPCs) in this scenario. We present the relationship between the delay spreads and the transceiver distances. The measured route can be divided into four areas with different delay and Doppler characteristics. Finally, a tapped delay line (TDL) model is proposed to parameterize the channel responses in the HSR hilly environment, which is supposed to provide criterions for evaluations of the radio interface and development of wireless communication system.

Channel Measurements and Models for High-Speed Train Communication Systems: A Survey

“…Due to the high speed of the train and the hostile HST environments, conducting accurate channel measurements for HST communication systems is challenging and needs to address particular hardware and software requirements, e.g., robustness, scalability, hardware redundancy and traceability [41]. Many measurement campaigns [42], [44]- [48], [51]- [75], [77]- [79], [81]- [90] for different HST environments were presented in the literature. Here, we will briefly review and classify the important measurements for HST communications according to the scenarios, cellular architecture, measurements' setup parameters (i.e., antenna configuration, carrier frequency, and bandwidth), and measured channel statistics, as shown in Table I.…”

“…4) In the hilly terrain scenario [75], [77], the surrounding environment is densely scattered with objects distributed irregularly and non-uniformly. With high-altitude transmit antennas and low-attitude obstacles, the LoS component is observable and can be detected along the entire railway.…”

Broadband Wireless Channel in Composite High-Speed Railway Scenario: Measurements, Simulation, and Analysis

“…The propagation characteristics in a small passageway tunnel for non-line-of-sight (NLoS) are studied in [24], and the model is given to predict the path loss, power delay profile (PDP), root-mean-square (RMS) delay spread, and coherence bandwidth. The tap delay line (TDL) models and Doppler characterizations for HSR hilly scenario are put forward in [25]. In [26], the propagation mechanisms at 2.35 GHz have been investigated for the viaduct scenario, where the path loss, time delay spread, and K-factor have been obtained to establish the statistical position-based channel models.…”

Channel Measurement and Modeling in Complex Environments

“…The fourth generation (4G) Long Term Evolution for Railway (LTE-R), is expected to provide not only optimized services for train control but also the high-quality internet access for passengers in the future. Several propagation measurement campaigns have been conducted in different HSR scenarios for the wireless channels, e.g., in viaducts [172,173,35], hilly terrains [174,175] cuttings [176,177,178], train stations [179,180], and tunnels [181,182] scenarios.…”

“…However, the existing measurement results [35,174] have stated that MPCs also exist in typical HSR environment. These MPCs with different delays result in the frequency selective fading to channel responses, which is important for future wideband communication system design [175]. In this section, the channel dispersion in the composite scenario that is composed of cuttings and viaduct are investigated.…”