Four-slope channel model for path loss prediction in tunnels at 400 MHz

Hrovat, Andrej; Kandus, Gorazd; Javornik, Tomaž

doi:10.1049/iet-map.2009.0159

Cited by 56 publications

(63 citation statements)

References 10 publications

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“…In general, the abscissa of the break point d 1 depends on the tunnel excitation conditions and hence, on the position of the Tx antenna in the transverse plane, and on its radiation pattern. For a longer transmission range, a three/fourslope model has also been proposed (Hrovat et al, 2010).…”

Section: Path Loss Determined From a Propagation Model In A Rectangulmentioning

confidence: 99%

Wireless Communication in Tunnels

Molina‐Garcia‐Pardo¹,

Liénard²,

Degauque³

2012

Digital Communication

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Section: Path Loss Determined From a Propagation Model In A Rectangulmentioning

confidence: 99%

Wireless Communication in Tunnels

Molina‐Garcia‐Pardo¹,

Liénard²,

Degauque³

2012

Digital Communication

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“…Since the UHF is considerably higher than the cutoff frequency of the fundamental modes, a wide range of E mn multiple modes propagate inside tunnels when the free space segment ends [18]. Using modal theory, the losses of horizontally and vertically polarized E mn modes can be given by…”

Section: Propagation Loss In the Multi-mode Waveguide Segmentmentioning

confidence: 99%

“…To overcome this limitation, a novel structure with a clear division point between different propagation mechanisms is highly desired. The authors of [ 18] divide the near-region into two segments and model the path loss in each segment. Concerning their division point, the model in the free space is employed to calculate the location [18].…”

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confidence: 99%

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Modeling of the Division Point of Different Propagation Mechanisms in the Near-Region Within Arched Tunnels

Guan

Zhang

et al. 2011

Wireless Pers Commun

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An accurate characterization of the near-region propagation of radio waves inside tunnels is of practical importance for the design and planning of advanced communication systems. However, there has been no consensus yet on the propagation mechanism in this region. Some authors claim that the propagation mechanism follows the free space model, others intend to interpret it by the multi-mode waveguide model. This paper clarifies the situation in the near-region of arched tunnels by analytical modeling of the division point between the two propagation mechanisms. The procedure is based on the combination of the propagation theory and the three-dimensional solid geometry. Three groups of measurements are employed to verify the model in different tunnels at different frequencies. Furthermore, simplified models for the division point in five specific application situations are derived to facilitate the use of the model. The results in this paper could help to deepen the insight into the propagation mechanism within tunnel environments.

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“…Most wireless communications networks in subway tunnels use narrow band systems like TETRA or GSM [1,2], however, with the development of third generation mobile communication, high capacity and efficient communications are needed in subway tunnels for metros controlling and to give better service for the passengers. Therefore, it does require an accurate broadband characteristic and model of the tunnels to build the wireless network.…”

Section: Introductionmentioning

confidence: 99%

Broadband Channel Long Delay Cluster Measurements and Analysis at 2.4GHz in Subway Tunnels

Zhang

Briso-Rodríguez³

2011

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

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Abstract-The delay caused by the reflected ray in broadband communication has a great influence on the communications in subway tunnel. This paper presents measurements taken in subway tunnels at 2.4 GHz, with 5 MHz bandwidth. According to propagation characteristics of tunnel, the measurements were carried out with a frequency domain channel sounding technique, in three typical scenarios: line of sight (LOS), Nonline-of-sight (NLOS) and far line of sight (FLOS), which lead to different delay distributions. Firstly IFFT was chosen to get channel impulse response (CIR) h(t) from measured threedimensional transfer functions. Power delay profile (PDP) was investigated to give an overview of broadband channel model. Thereafter, a long delay caused by the obturation of tunnel is observed and investigated in all the scenarios. The measurements show that the reflection can be greatly remained by the tunnel, which leads to long delay cluster where the reflection, but direct ray, makes the main contribution for radio wave propagation. Four important parameters: distribution of whole PDP power, first peak arriving time, reflection cluster duration and PDP power distribution of reflection cluster were studied to give a detailed description of long delay characteristic in tunnel. This can be used to ensure high capacity communication in tunnels.

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Four-slope channel model for path loss prediction in tunnels at 400 MHz

Cited by 56 publications

References 10 publications

Wireless Communication in Tunnels

Wireless Communication in Tunnels

Modeling of the Division Point of Different Propagation Mechanisms in the Near-Region Within Arched Tunnels

Broadband Channel Long Delay Cluster Measurements and Analysis at 2.4GHz in Subway Tunnels

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