Propagation mechanism modelling in the near region of circular tunnels

Guan, Ke; Zhang, Zhong; Ai, Bo; Briso-Rodríguez, César

doi:10.1049/iet-map.2011.0381

Cited by 17 publications

(4 citation statements)

References 8 publications

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“…As the representatives of deterministic models, modal analysis based on waveguide theory [15], [16], models based on geometrical optics (GO) approach [17]- [19], and models based on numerical methods for solving Maxwell equations for tunnel environment, e.g., vector parabolic equation techniques [20], support an accurate way to predict the propagation characteristics in tunnels. On the other hand, empirical models, such as two-slope models [21], [22], three-slope model [23], [24], four-slope model [25], [26], and five-zone models [27], [28], etc., predict the propagation in tunnels in a fast and effective way. However, most of these models are sophisticated for the straight tunnels.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Extra Propagation Loss of Tunnel Curve

Guan

Zhang

et al. 2016

IEEE Trans. Veh. Technol.

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Abstract-Wave propagation experiences extra loss in curved tunnels, which is highly desired for network planning. Extensive narrow-band propagation measurements are made in two types of Madrid subway tunnels (different cross sections and curvatures) with various configurations (different frequencies and polarizations). A ray tracer validated by the straight and curved parts of the measuring tunnels is employed to simulate the reference received signal power by assuming the curved tunnel to be straight. By subtracting the measured received power in the curved tunnels from the simulated reference power, the extra loss resulting from the tunnel curve is extracted. Finally, this paper presents the figures and tables quantitatively reflecting the correlations between the extra loss and radius of curvature, frequency, polarization, and cross section, respectively. The results are valuable for statistical modeling and the involvement of the extra loss in the design and network planning of communication systems in subway tunnels.

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Section: Introductionmentioning

confidence: 99%

Measurement and Analysis of Extra Propagation Loss of Tunnel Curve

Guan

Zhang

et al. 2016

IEEE Trans. Veh. Technol.

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“…(1) Propagation characteristics in the tube: For the design of wireless communications network, the knowledge of the wireless channel, which has a close relationship with propagation scenarios, is the fundamental basis. Different from traditional tunnel scenarios [21][22][23][24], which mainly consists of stone and clay, the vactrains are operating inside the fully enclosed metal tube wall, resulting in the unique propagation environment for wireless signal. From the aspect of waveguide, the concept of "mode" can be used to analyze the propagation characterization of radio waves in the tube [25,26].…”

Section: Key Challenges Of Vactrain's Wireless Communicationsmentioning

confidence: 99%

Broadband Wireless Communication Systems for Vacuum Tube High-Speed Flying Train

et al. 2020

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A vactrain (or vacuum tube high-speed flying train) is considered as a novel proposed rail transportation approach in the ultra-high-speed scenario. The maglev train can run with low mechanical friction, low air resistance, and low noise mode at a speed exceeding 1000 km/h inside the vacuum tube regardless of weather conditions. Currently, there is no research on train-to-ground wireless communication system for vactrain. In this paper, we first summarize a list of the unique challenges and opportunities associated with the wireless communication for vactrain, then analyze the bandwidth and Quality of Service (QoS) requirements of vactrain’s train-to-ground communication services quantitatively. To address these challenges and utilize the unique opportunities, a leaky waveguide solution with simple architecture but excellent performance is proposed for wireless coverage for vactrains. The simulation of the leaky waveguide is conducted, and the results show the uniform phase distribution along the horizontal direction of the tube, but also the smooth field distribution at the point far away from the leaky waveguide, which can suppress Doppler frequency shift, indicating that the time-varying frequency-selective fading channel could be approximated as a stationary channel. Furthermore, the train-to-ground wireless access architectures based on leaky waveguide are studied and analyzed. Finally, the moving scheme is adopted based on centralized, cooperative, cloud Radio Access Network (C-RAN), so as to deal with the extremely frequent handoff issue.

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“…11. Similar to the approaches done for tunnels in [13][14][15], we introduce a near and far region. The use of two slope models in the near and far region is rather common for propagation modelling in tunnels.…”

Section: Sub-urbanmentioning

confidence: 99%

Path loss models for train‐to‐train communications in typical high speed railway environments

Unterhuber

Sand

Fiebig

et al. 2018

IET Microwaves, Antennas & Propagation

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Within the next few decades, railways will undergo a major modernisation in order to increase their efficiency and safety. The modernisation process will enable new concepts such as fully autonomous trains and dynamic coupling of consists. Today's centralised railway management systems will not be able to safely handle these train concepts and, thus, will be replaced or complemented by new systems. These systems require a tight train monitoring which is based on the reliable exchange of information covering among others the accurate position and velocity of trains. The authors are sure that modern train concepts demand both reliable train‐to‐train (T2T) communication and improved capabilities for train‐to‐ground communication. However, T2T communication is hardly investigated and so far no technology has been selected. With this publication, the authors like to provide more insight into T2T signal propagation. This is the basis for the future development of a modern T2T communication system. The authors focus on wide band propagation for T2T scenarios and describe an extensive channel sounding measurement campaign involving two high speed trains. Results on signal propagation measurements in high speed T2T scenarios are presented for different environments. Hence, path loss models for rural, sub‐urban and tunnel environments are introduced.

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Propagation mechanism modelling in the near region of circular tunnels

Cited by 17 publications

References 8 publications

Measurement and Analysis of Extra Propagation Loss of Tunnel Curve

Measurement and Analysis of Extra Propagation Loss of Tunnel Curve

Broadband Wireless Communication Systems for Vacuum Tube High-Speed Flying Train

Path loss models for train‐to‐train communications in typical high speed railway environments

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