Measurement and Analysis of Extra Propagation Loss of Tunnel Curve

Ai, Bo; Guan, Ke; Zhang, Zhong; López, Carlos F.; Zhang, Lei; Briso-Rodríguez, César; He, Ruisi

doi:10.1109/tvt.2015.2425218

Cited by 23 publications

(8 citation statements)

References 41 publications

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“…It has been found in [3] and [33] that the correlation length range of shadowing varies significantly from 5 m to 300 m, which depends on the relevant dimensions of the signal propagation environment. In the case of tunnels we take a typical value for the subsection length is to be 60 m, which is consistent with reported shadow correlation lengths of a small number of 10s of meters in [18] and [34] .…”

Section: A System Modellingsupporting

confidence: 82%

A Practical Access Point Deployment Optimization Strategy in Communication-Based Train Control Systems

Wen

Constantinou

Chen

et al. 2019

IEEE Trans. Intell. Transport. Syst.

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Communication-based train control (CBTC) systems have been playing a progressively significant role in metro signalling in recent years. As safety-critical systems, CBTC systems have very strict requirements on the wireless communication performance between train and wayside access points (AP), which is highly dependent on the deployment of the APs. In this paper, by customizing and adopting a decompositionbased multiobjective evolutionary algorithm, the proposed AP deployment optimization method has been implemented, verified and its implementation accuracy has been assessed. A real-world case study is carried out in an integrated simulation platform, in which the optimized AP deployments are verified and show better performance than the original planning. Index Terms-Communication-based train control (CBTC), AP deployment planning, multiobjective optimisation and integrated simulation platform.

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Section: A System Modellingsupporting

confidence: 82%

A Practical Access Point Deployment Optimization Strategy in Communication-Based Train Control Systems

Wen

Constantinou

Chen

et al. 2019

IEEE Trans. Intell. Transport. Syst.

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“…In the curved tunnel as shown in Figure 2, y represents the distance between two reflection points (P1 and P2) in the tunnel with the radius of curvature (R), and ϕ1 can be defined as: In comparison with the incident angle in the straight tunnel (ϕs), as shown in Figure 3, the decrease in the incident angle in the curvature (ϕc) leads to an increase in reflection times and a decrease in the reflection coefficient, which generates EL in the curved tunnel, as shown in Figure 4. The EL can be expressed as: According to (6), the EL can be rewritten as a function of the propagation distance of curvature (z). According to (6), the EL can be rewritten as a function of the propagation distance of curvature (z).…”

Section: The Joint Channel Model Based On Waveguide and Sbrmentioning

confidence: 99%

“…Channel modeling approaches in tunnel environments can be categorized into statistical methods and deterministic methods [6,7]. Classical statistical models, such as the close-in (CI) model [8] and floating intercept (FI) model [9], have low complexity and high computing efficiency, but with limited accuracy [10].…”

Section: Introductionmentioning

confidence: 99%

Path Loss Model for 3.5 GHz and 5.6 GHz Bands in Cascaded Tunnel Environments

Qian

Saleem

et al. 2022

Sensors

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An important and typical scenario of radio propagation in a railway or subway tunnel environment is the cascaded straight and curved tunnel. In this paper, we propose a joint path loss model for cascaded tunnels at 3.5 GHz and 5.6 GHz frequency bands. By combining the waveguide mode theory and the method of shooting and bouncing ray (SBR), it is found that the curvature of tunnels introduces an extra loss in the far-field region, which can be modeled as a linear function of the propagation distance of the signal in the curved tunnel. The channel of the cascaded straight and curved tunnel is thus characterized using the extra loss coefficient (ELC). Based on the ray-tracing (RT) method, an empirical formula between ELC and the radius of the curvature is provided for 3.5 GHz and 5.6 GHz, respectively. Finally, the accuracy of the proposed model is verified by measurement and simulation results. It is shown that the proposed model can predict path loss in cascaded tunnels with desirable accuracy and low complexity.

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“…Based on the results as mentioned above, the summary conclusions are that: A higher frequency wave in straight tunnels has a better performance than it in the curved line; The wave in straight tunnels has a better performance than in free space; A lower frequency wave can better implement the communication task in different scenarios [24]; The extreme communication distance is limited in curved lines …”

Section: Propagation In Different Scenariosmentioning

confidence: 99%

Propagation and safety analysis of the train‐to‐train communication system

Song

Dong

et al. 2019

IET Microwaves, Antennas & Propagation

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Smart railway transportation systems aim to make the trains operate in a more intelligent and flexible manner. Reliable train‐to‐train communication, which can increase the efficiency and safety of the train operation, is getting more concern in recent researches, and different communication solutions can be applied to carry out the data communication. However, its propagation and safety analysis is not systematically put forward. In this work, the structure and working principle of a train‐to‐train communication system are proposed. In order to have a better performance, multi‐communication channels are involved. Three different modems are applied to make sure that the system can implement the communication task in different situations. What is more, the long‐range communication modem provides not only long distance communication but also distance measurement between two trains. The propagation analysis based on different carrier waves and application scenarios is discussed. The system safety is evaluated by means of Petri nets, and the analysis procedure can be reused for analysing different system structures.

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Measurement and Analysis of Extra Propagation Loss of Tunnel Curve

Cited by 23 publications

References 41 publications

A Practical Access Point Deployment Optimization Strategy in Communication-Based Train Control Systems

A Practical Access Point Deployment Optimization Strategy in Communication-Based Train Control Systems

Path Loss Model for 3.5 GHz and 5.6 GHz Bands in Cascaded Tunnel Environments

Propagation and safety analysis of the train‐to‐train communication system

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