Radio Communication in Tunnels

Chiba, J.; Inaba, Takayuki; Kuwamoto, Y.; Banno, Osamu; Sato, Ryo

doi:10.1109/tmtt.1978.1129409

Cited by 76 publications

(16 citation statements)

References 9 publications

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“…Previously, electromagnetic wave propagation in tunnel environments has been studied in detail by comparing them with hollow dielectric waveguides using the basic waveguide theory [1,2]. Because wave propagation is possible only above a specific cutoff frequency that is determined by the tunnel dimensions and cross-sectional shape, many studies have focused on the shape of the tunnel to analyse the electromagnetic field distribution therein [3].…”

mentioning

confidence: 99%

Characterisation of electromagnetic properties in iron-mine production tunnels

et al. 2012

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Modern underground mines require reliable wireless communication for transmitting voice data, operating surveillance cameras, and monitoring mining equipment such as heavy vehicles. The electromagnetic characteristics of mines therefore have to be considered when determining the type of wireless technology for such critical applications. In this reported work, measurements of radio interference levels, path loss, and multipath propagation are performed in the world's now largest iron ore mine, situated in Sweden, to determine a suitable wireless technology for this mine.

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confidence: 99%

Characterisation of electromagnetic properties in iron-mine production tunnels

et al. 2012

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“…1b and 1c, respectively. The relative dielectric constant and the conductivity of the lossy material outside the tunnel are 5.5 and 0.03 S/m, respectively, according to Chiba [10]. The transmitting and receiving antennas are both half-wave dipoles and vertically polarized.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…An alternative way to establish communication in tunnels is building a relay antenna at the entrance of tunnels. Some results of narrow-band propagation characteristics in empty tunnels have been presented [8][9][10][11][12][13]. Nevertheless, only a few investigations have been made on narrow-band propagation characteristics for tunnels with traffic [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

BER Performance of Wireless BPSK Communication System in Tunnels With and Without Traffic

Chen

Chiu

Hung

et al. 2004

Wireless Pers Commun

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The bit error rate (BER) performance for high-speed personal communication service in tunnels with and without traffic is investigated. The impulse responses of tunnels for any transmitter-receiver location are computed by shooting and bouncing ray/image techniques. By using the impulse responses of these multipath channels, the BER performance of BPSK (binary phase shift keying) system with phase and timing recovery circuits are calculated. Numerical results have shown that the multipath effect by the vehicles in the tunnel is an important factor for BER performance. In addition, the effect of space diversity techniques and decision feedback equalizer on mitigating the multipath fading is also investigated.

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“…They have carried out narrow band analysis in terms of propagation factor and linear regression slopes and wide-band analysis by calculating delay spread factors. Earlier work on tunnels employed modal theory due to the strong guiding characteristics [8][9][10][11][12].…”

Section: Introductionmentioning

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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Radio Communication in Tunnels

Cited by 76 publications

References 9 publications

Characterisation of electromagnetic properties in iron-mine production tunnels

Characterisation of electromagnetic properties in iron-mine production tunnels

BER Performance of Wireless BPSK Communication System in Tunnels With and Without Traffic

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

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