Fading Characteristics of Wireless Channel on High-Speed Railway in Hilly Terrain Scenario

This paper focuses on the fading characteristics of wireless channel on High-Speed Railway (HSR) in hilly terrain scenario. Due to the rapid speed, the fading characteristics of HSR channel are highly correlated with time or Transmit-Receive distance and have their own special property. To investigate the fading characteristics, the measurement is conducted on the Guangzhou-Shenzhen passenger-dedicated line in China with the speed of 295 km/h in the data-collection area at 2.4 GHz. From the measured data, the amplitude of each path is estimated by using the Subspace-Alternating Generalized Expectation-Maximization (SAGE) algorithm along with other parameters of channel impulse responses. Then the fading parameters, including path loss, shadow fading, andK-factor, are analysed. With the numerical results in the measurement and analysis, the fading characteristics have been revealed and modelled. It is supposed that this work has a promotion for HSR communication system design and improvement.

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

Wireless Communications and Mobile Computing ◽

10.1155/2017/2897636 ◽

2017 ◽

Vol 2017 ◽

pp. 1-15 ◽

Cited By ~ 4

Author(s):

Jianwen Ding ◽

Lei Zhang ◽

Jingya Yang ◽

Bin Sun ◽

Jiying Huang

Keyword(s):

Ray Tracing ◽

Communication Systems ◽

High Speed ◽

Channel Model ◽

High Reliability ◽

Rapid Development ◽

Path Loss ◽

Wireless Channel ◽

Delay Spread ◽

High Speed Railway

The rapid development of high-speed railway (HSR) and train-ground communications with high reliability, safety, and capacity promotes the evolution of railway dedicated mobile communication systems from Global System for Mobile Communications-Railway (GSM-R) to Long Term Evolution-Railway (LTE-R). The main challenges for LTE-R network planning are the rapidly time-varying channel and high mobility, because HSR lines consist of a variety of complex terrains, especially the composite scenarios where tunnels, cuttings, and viaducts are connected together within a short distance. Existing researches mainly focus on the path loss and delay spread for the individual HSR scenarios. In this paper, the broadband measurements are performed using a channel sounder at 950 MHz and 2150 MHz in a typical HSR composite scenario. Based on the measurements, the pivotal characteristics are analyzed for path loss exponent, power delay profile, and tap delay line model. Then, the deterministic channel model in which the 3D ray-tracing algorithm is applied in the composite scenario is presented and validated by the measurement data. Based on the ray-tracing simulations, statistical analysis of channel characteristics in delay and Doppler domain is carried out for the HSR composite scenario. The research results can be useful for radio interface design and optimization of LTE-R system.

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Channel Characteristics of High-Speed Railway Station Based on Ray-Tracing Simulation at 5G mmWave Band

International Journal of Antennas and Propagation ◽

10.1155/2019/3137583 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10

Author(s):

Lei Xiong ◽

Haiyang Miao ◽

Bo Ai ◽

Tutun Juhana ◽

Adit Kurniawan

Keyword(s):

Ray Tracing ◽

Antenna Arrays ◽

High Speed ◽

Wireless Channel ◽

Delay Spread ◽

Shadow Fading ◽

Railway Station ◽

High Speed Railway ◽

Channel Characteristics ◽

Ray Tracing Simulation

In order to satisfy the increasing demand for the higher transmission capacity of “smart station”, millimeter wave (mmWave) technology is expected to play a significant role in the high data rate communication system. Based on the ray-tracing simulation technology, this paper would study wireless channel characteristics of the three-dimensional (3D) model of high-speed railway station at the mmWave band. Key parameters such as path loss exponent, shadow fading factor, delay spread, Rician K-factor, angular spread, power angle spectrum, and spatial correlation are extracted and investigated. These channel characteristics are of value for the selection of antenna arrays and even the design of future 5G communication networks in the railway environment.

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A Generic Method for the Reliable Calculation of Large-Scale Fading in an Obstacle-Dense Propagation Environment

Integrated Models for Information Communication Systems and Networks ◽

10.4018/978-1-4666-2208-1.ch012 ◽

2013 ◽

pp. 256-277

Author(s):

Theofilos Chrysikos ◽

Stavros Kotsopoulos ◽

Eduard Babulak

Keyword(s):

Large Scale ◽

Path Loss ◽

Signal Strength ◽

Channel Modeling ◽

Wireless Channel ◽

Mathematical Tool ◽

Shadow Fading ◽

Estimation Model ◽

Statistical Parameters ◽

Wireless Channel Modeling

The aim of this chapter is to summarize and present recent findings in the field of wireless channel modeling that provide a new method for the reliable calculation of the statistical parameters of large-scale variations of the average received signal (shadow fading). This algorithm is theoretically based on a path loss estimation model that incorporates losses due to walls and floors. This has been confirmed to be the most precise mathematical tool for average signal strength prediction for various frequencies of interest and propagation environments. The total path loss is estimated as a sum of two independent attenuation processes: free space loss and losses due to obstacles. This solution allows for a direct and reliable calculation of the deviation of the fluctuations of the average received signal in an obstacle-dense environment.

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