Two-Slope Path Loss Model for Curved-Tunnel Environment With Concept of Break Point

The curvature of tunnels introduces an extra loss in the wave propagation. A simulation and measurement study are performed on the straight and the curved tunnels to investigate the extra loss in the curved tunnels in comparison with the straight tunnels at a frequency of 2.4 GHz. This study suggest...

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Bibliographic Details
Published in:IEEE transactions on intelligent transportation systems 2021-12, Vol.22 (12), p.7850-7859
Main Authors: Kalyankar, Shravan Kumar, Lee, Yee Hui, Meng, Yu Song
Format: Article
Language:English
Subjects:
Antenna measurements
Channel models
Curvature
curved tunnel
Distortion measurement
path loss measurement
Performance evaluation
Propagation
Propagation losses
Radio communications
Radio transmitters
Radio waves
Transmitting antennas
tunnel propagation
Tunnels
two-slope model
Wave propagation
waveguiding effect
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Summary:The curvature of tunnels introduces an extra loss in the wave propagation. A simulation and measurement study are performed on the straight and the curved tunnels to investigate the extra loss in the curved tunnels in comparison with the straight tunnels at a frequency of 2.4 GHz. This study suggests the existence of two wave propagation mechanisms in the curved tunnel; enhanced waveguiding mechanism induced by rich multipath components from the curved tunnels and degraded waveguiding mechanism due to the blockage from the curved tunnel walls. For efficient radio planning, a new propagation model with curvature dependent break point is proposed. The proposed break point indicates the end of the enhanced waveguiding mechanism and the beginning of the degraded waveguiding mechanism . A two-slope radio wave propagation model is then proposed for radio communications inside curved tunnels by using the determined break point, with performance evaluation.
ISSN:1524-9050
1558-0016
DOI:10.1109/TITS.2020.3012724