Ray-optical prediction of radio-wave propagation characteristics in tunnel environments. 2. Analysis and measurements

Zhang, Y.P.; Hwang, Y.; Kouyoumjian, R. G.

doi:10.1109/8.719977

Cited by 101 publications

(30 citation statements)

References 21 publications

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“…Conventional ray-tracing techniques, based on ray launching [1], imaging [2]- [5], or a combination of both [6], [7], have in common that they can only treat reflections at plane boundaries. The reason for this is the so-called multiple ray problem [8], where adjacent rays are too closely spaced to be considered as independent [9].…”

Section: The Simulation Approachmentioning

confidence: 99%

Subway tunnel guided electromagnetic wave propagation at mobile communications frequencies

Didascalou¹,

Maurer²,

Wiesbeck³

2001

IEEE Trans. Antennas Propagat.

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A measurement campaign has been carried out in the Berlin subway to characterize electromagnetic wave propagation in underground railroad tunnels. The received power levels at 945 and 1853.4 MHz are used to evaluate the attenuation and the fading characteristics in a curved arched-shaped tunnel. The measurements are compared to ray-optical modeling results, which are based on ray density normalization. It is shown that the geometry of a tunnel, especially the cross-sectional shape and the course, is of major impact on the propagation behavior and thus on the accuracy of the modeling, while the material parameters of the building materials have less impact.

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Section: The Simulation Approachmentioning

confidence: 99%

Subway tunnel guided electromagnetic wave propagation at mobile communications frequencies

Didascalou¹,

Maurer²,

Wiesbeck³

2001

IEEE Trans. Antennas Propagat.

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“…The model reveals some important propagation characteristics of the radio propagation channel in the tunnel. Considering a narrow-band communication system, as reported by many authors [14], [15], we notice that the multipath causes small-scale fading and some sporadic severe attenuation of the signals. Energy also seems to fill the entire empty tunnel without the possibility of selectively addressing one or the other parallel track.…”

Section: Base Radio Coverage Using Antennasmentioning

confidence: 76%

Leaky Waveguide for Train-to-Wayside Communication-Based Train Control

Heddebaut¹

2009

IEEE Trans. Veh. Technol.

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Abstract-In guided urban automated transportation systems, the maintenance of a high-quality broadband train-to-wayside communication at all locations along the track poses a major problem. Several techniques are currently used. However, to achieve sufficient rates, a communication frequency range of 2-6 GHz is widely in use. At these frequencies, the natural propagation in tunnels usually works efficiently, but the communication through a leaky waveguide that is continuously laid along the track has several advantages. Over the required communication ranges of several hundred meters, between stations, such waveguides provide low longitudinal attenuation and remain of reasonable size. They also provide predictable communication ranges that could offer significant advantages over the natural propagation approach. This paper will theoretically and experimentally describe such a technical solution. Using ray-optical modeling of the radio propagation in a railway-type tunnel, the radiation characteristics of such a system will be evaluated. At the same operating frequencies, it will be compared with a conventional base solution using antennas separated a few hundred meters apart. An example of a recently operational implemented system will be presented.

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“…Hwang et al developed uniform theory of diffraction (UTD) [17] for predicting narrow band and wideband propagation losses at 900 and 1,800 MHz (part II) [18]. The first comparison is made at 900 MHz in a 2-km length tunnel with a 4 m in height and 7.5 m in width for vertical propagation.…”

Section: Discussionmentioning

confidence: 99%

Some experimental investigation of the effect of railway tunnels on mobile communications in Western India

Prasad

Dalela

2008

Ann. Telecommun.

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Establishing of mobile communications in guided structures like railway tunnels, coal mines, etc., is gaining increasing importance due to the passage of high speed and high density of trains in tunnels and for monitoring of information on safety of workers and dayto-day operations in various mines. The present study reports investigation of mobile communication experiments in ultra high frequency band in railway tunnels of western India conducted in a moving train both in uplink and downlink directions. The observed signal fluctuations are discussed in terms of tunnel characteristics and different modes of propagation in tunnels and compared with model deduced values.

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Ray-optical prediction of radio-wave propagation characteristics in tunnel environments. 2. Analysis and measurements

Cited by 101 publications

References 21 publications

Subway tunnel guided electromagnetic wave propagation at mobile communications frequencies

Subway tunnel guided electromagnetic wave propagation at mobile communications frequencies

Leaky Waveguide for Train-to-Wayside Communication-Based Train Control

Some experimental investigation of the effect of railway tunnels on mobile communications in Western India

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