Characterization of UHF radio propagation channels in tunnel environments for microcellular and personal communications

Zhang, Y.P.; Hwang, Y.

doi:10.1109/25.661054

Cited by 87 publications

(58 citation statements)

References 33 publications

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“…The corresponding value for the 5.8 GHz band is 5 ns. Delay spread in a rectangular concrete subway tunnel, 3.5 m wide and 2.6 m high, at a carrier frequency of 1.8 GHz and over a 400 MHz band was found to be equal to 5.5 ns for a 50 m separation between the transmit and receive antennas [6].…”

Section: Delay Spreadmentioning

confidence: 99%

“…For a rectangular tunnel, 8 m × 5.6 m, the theoretical values of the D s deduced from the ray approach are larger and vary from 6 ns in the near zone to 4 ns beyond 100 m. The difference may be due to the idealized rectangular shape of the tunnel in the theoretical model, instead of the curved shape of the tunnel where experiments took place. The values of D s can be compared to those measured in an empty tunnel, without obstacles, and described by other authors as in [3] and [6]. In a 70 m long mine gallery, it was shown [3] that D s in the 2.4 GHz band is less than or equal to 6.3 ns for 50% of all locations.…”

Section: Delay Spreadmentioning

confidence: 99%

“…In [5], narrow band measurements at 2 GHz in a railway tunnel are described and the path loss, the probability distribution with respect to fading widths and the distance between successive fading are given. The results of narrowband and wideband propagation measurements conducted at 900 and 1800 MHz in five tunnels are presented in [6]. Narrowband propagation is characterized in terms of power distance law, slow fading, and fast fading statistics, whereas the rms delay spread is the chosen metric.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Double Directional Channel Measurements in an Arched Tunnel and Interpretation Using Ray Tracing in a Rectangular Tunnel

Garcia-Pardo¹,

Molina‐Garcia‐Pardo²,

Liénard³

et al. 2012

PIER M

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Abstract-The objective of this paper is to study the wideband characteristics of the radio channel in a tunnel environment, not only the delay spread, but also the angle of departure/arrival of the rays, their relative weights and their delays, which are important values for Multiple-Input Multiple-Output applications. In order to achieve this goal, a measurement campaign has been carried out in a straight arched tunnel over a frequency band extending from 2.8 to 5.0 GHz and distance varying from 50 m up to 500 m. First, the variations of the channel impulse response and of the delay spread versus the distance between the transmitter and the receiver are analyzed. Then, the bidirectional channel characteristics have been extracted from the measured channel matrices using a high resolution estimation algorithm. The main contribution of this paper is to clearly show the quantitative variation of the delay spread and the angle of departure/arrival of the rays along a real tunnel and to investigate the possibility of using the ray theory in a rectangular tunnel to interpret experimental results obtained in an arched tunnel.

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Section: Delay Spreadmentioning

confidence: 99%

Section: Delay Spreadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double Directional Channel Measurements in an Arched Tunnel and Interpretation Using Ray Tracing in a Rectangular Tunnel

Garcia-Pardo¹,

Molina‐Garcia‐Pardo²,

Liénard³

et al. 2012

PIER M

View full text Add to dashboard Cite

show abstract

“…A great number of propagation models presented in the last four decades indicate that there exists a 'critical distance' [1,2], usually called the break point [1][2][3]. The propagation characteristics including path loss, shadow fading and small-scaled fading are different before and after the break point [2,4,5].…”

Section: Introductionmentioning

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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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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“…A number of propagation models inside tunnels presented in the last four decades indicate that there is a "critical distance" [1,2], usually called the break point [1][2][3]. In front of and behind this break point, the propagation characteristics including path loss, shadow fading and small-scale fading are considerably different [2,4,5].…”

mentioning

confidence: 99%

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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Characterization of UHF radio propagation channels in tunnel environments for microcellular and personal communications

Cited by 87 publications

References 33 publications

Double Directional Channel Measurements in an Arched Tunnel and Interpretation Using Ray Tracing in a Rectangular Tunnel

Double Directional Channel Measurements in an Arched Tunnel and Interpretation Using Ray Tracing in a Rectangular Tunnel

Propagation mechanism modelling in the near region of circular tunnels

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

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