Wireless propagation in tunnels

Dudley, D.G.; Liénard, M.; Mahmoud, Samir F.; Degauque, P.

doi:10.1109/map.2007.376637

Cited by 206 publications

(145 citation statements)

References 20 publications

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“…• First group of measurements in the vehicle runnel [16]: A = 0.66, R = 4.3, x t =1.8, y t =0, z t = 0, x r =1.8, Jr=0.…”

Section: Dividing Point Between Different Propagation Mechanismsmentioning

confidence: 99%

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Propagation mechanism modelling in the near region of circular tunnels

Guan

Zhang

et al. 2012

IET Microw. Antennas Propag.

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Along with the increase in operating frequencies in advanced radio communication systems utilised inside tunnels, the location of the break point is further and further away from the transmitter. This means that the near región lengthens considerably and even occupies the whole propagation cell or the entire length of some short tunnels. To begin with, this srudy analyses the propagation loss resulting from the free-space mechanism and the multi-mode waveguide mechanism in the near región of circular tunnels, respectively. Then, by conjunctive employing the propagation theory and the three-dimensional solid geometry, a general analytical model of the dividing point between two propagation mechanisms is presented for the first time. Moreover, the model is validated by a wide range of measurement campaigns in different tunnels at different frequencies. Finally, discussions on the simplified formulae of the dividing point in some application siruations are made. The results in this srudy can be helpful to grasp the essence of the propagation mechanism inside tunnels.

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“…• First group of measurements in the vehicle runnel [16]: A = 0.66, R = 4.3, x t =1.8, y t =0, z t = 0, x r =1.8, Jr=0.…”

Section: Dividing Point Between Different Propagation Mechanismsmentioning

confidence: 99%

“…• Second group of measurements in the vehicle runnel [16]: A = 0.33, R = 4.3, x t = 1.8, y t = 0, z t = 0, x r = 1.8, j r = 0. Table 1 shows the global comparisons of the dividing point inside tunnels between the results of model and the measurements.…”

Section: Dividing Point Between Different Propagation Mechanismsmentioning

confidence: 99%

Propagation mechanism modelling in the near region of circular tunnels

Guan

Zhang

et al. 2012

IET Microw. Antennas Propag.

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“…In the literature, there are mainly three types of models to characterize the wireless channel in empty tunnels [6]: the Geometrical Optical model (GO model) [7], [8], the Waveguide model [9], and the Full Wave model [10]. The GO model and the Full Wave model can only provide numerical results and the computational complexity is high.…”

Section: Related Workmentioning

confidence: 99%

Capacity and Outage Analysis of MIMO and Cooperative Communication Systems in Underground Tunnels

Sun

Akyildiz

Hancke

2011

IEEE Trans. Wireless Commun.

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Abstract-In underground mine and road tunnels, multipath fading is much more severe than in the terrestrial wireless channels. To overcome the multipath fading in underground tunnels, MIMO (Multiple Input Multiple Output) and Cooperative Communication system can be utilized. Since the underground channel characteristics are significantly different from those in terrestrial environments, the channel capacity and the outage behavior of such systems need to be investigated based on underground tunnel channel models, which had not been addressed by the research community yet. In this paper, the capacity distribution and outage probability of MIMO and cooperative communication systems are investigated in underground tunnel environments. Explicit formulas of the capacity distribution and outage probability are developed as functions of environmental conditions and system configurations. Based on the capacity and outage analysis in underground tunnels, the optimal MIMO antenna geometry design scheme is proposed for MIMO systems; and the cooperative relay assignment protocol is developed for cooperative communication systems. Simulations are conducted to validate the theoretical results.Index Terms-Underground tunnel, MIMO, cooperative communications, channel capacity, outage behavior, MIMO antenna geometry, cooperative relay assignment.

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“…The values of this parameter have been exhibited in Table. II for wide tunnel and narrow tunnel, respectively. The existing models for the radio-propagation inside subway tunnels are usually presented in a two slope curve [10][11], where the propagation path losses are predicted by two expres sions with a different slope parameter [12]. We can describe…”

Section: B Statistical Modeling Of Near Shadowing Phenomenonmentioning

confidence: 99%

“…bp d> bp (10) where LT represents the propagation loss inside tunnel, L Z NF and L Z FF are the loss in near-field zone and the loss in far field zone, respectively. bp is the position of breaking point which is the boundary between near-field zone and far-field zone.…”

Section: B Statistical Modeling Of Near Shadowing Phenomenonmentioning

confidence: 99%

Measurement and modeling of subway near shadowing phenomenon

Guan¹,

Zhang²,

Ai³

et al. 2010

Proceedings of the 5th International ICST Conference on Communications and Networking in China

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Abstract-This paper focuses on one vital aspect in propa gation characteristics inside subway tunnels: near shadowing phenomenon in a practical environment. In order to characterize this effect, an accurate measurement has been made at 2.4GHz in a real environment in Madrid subway. By analyzing the numerical results in this measurement, the characteristic of near shadowing phenomenon in propagation process has been revealed and corresponding engineering suggestions have been given in order to compensate the near shadowing effect. Finally, statistical model including the depth, duration and length of near shadowing, fast fading and attenuation inside wide tunnel and narrow tunnel has been built and simulated.

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Wireless propagation in tunnels

Cited by 206 publications

References 20 publications

Propagation mechanism modelling in the near region of circular tunnels

Propagation mechanism modelling in the near region of circular tunnels

Capacity and Outage Analysis of MIMO and Cooperative Communication Systems in Underground Tunnels

Measurement and modeling of subway near shadowing phenomenon

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