Effect of antenna on propagation characteristics of electromagnetic waves in tunnel environments

Huo, Yu; Xu, Zeshui; Hong-dang, Zheng; Zhou, Xing

doi:10.1109/primeasia.2009.5397396

Cited by 14 publications

(17 citation statements)

References 4 publications

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“…Beyond that, the position, polarization, and radiation pattern of transmitter and receiver antennas will also influence the radio wave propagation along the tunnel [53], [54]. In [55] and [56], the authors provide the optimal radiation pattern and position of antenna inside the tunnel. By using the antennas with appropriate radiation pattern at an appropriate position, the attenuation of radio signals inside tunnel can be reduced.…”

Section: Parameters Influencing Radio Propagation Inside Tunnelmentioning

confidence: 99%

Channel measurements and models for high-speed train wireless communication systems in tunnel scenarios: a survey

Liu

Ghazal

Wang

et al. 2017

Sci. China Inf. Sci.

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The rapid developments of high-speed trains (HSTs) introduce new challenges to HST wireless communication systems. Realistic HST channel models play a critical role in designing and evaluating HST communication systems. Due to the length limitation, bounding of tunnel itself, and waveguide effect, channel characteristics in tunnel scenarios are very different from those in other HST scenarios. Therefore, accurate tunnel channel models considering both large-scale and small-scale fading characteristics are essential for HST communication systems. Moreover, certain characteristics of tunnel channels have not been investigated sufficiently. This article provides a comprehensive review of the measurement campaigns in tunnels and presents some tunnel channel models using various modeling methods. Finally, future directions in HST tunnel channel measurements and modeling are discussed.Keywords 5G, HST, tunnel scenarios, tunnel channel measurements, tunnel channel models, non-stationary statistical properties. CitationLiu Y, Ghazal A, Wang C X, et al. Channel measurements and models for high-speed train wireless communication systems in tunnel scenarios: a survey. Sci China Inf Sci, 2016, 59(1): xxxxxx, doi: xxxxxxxxxxxxxx IntroductionHigh-speed trains (HSTs) have experienced a rapid development recently [1], and wireless technologies for HST communications will be considered as an important issue in the fifth generation (5G) wireless communication networks [2]. With the number of HST users increasing, numerous communication data need to be transmitted to train passengers through wireless channels. Therefore, high-capacity and reliable HST communication networks regardless of users' locations or speeds, are required. In order to meet these requirements, HST wireless communication systems need to mitigate various challenges resulting from the high * Corresponding author (email: cheng-xiang.wang@hw.ac.uk) 2 Liu Y, et al. Sci China Inf Sci speed of the train, such as frequent handovers, large Doppler spreads, and fast travel through different HST scenarios [3]. Currently, the most widely used HST communication system is the Global System for Mobile Communication Railway (GSM-R) [4]. It can be used for the train communication and control. However, it cannot satisfy the increasing communication requirements of high data rates. In recent years, the Long-Term Evolution-Railway (LTE-R) system, which is based on the LTE-Advanced (LTE-A) system, has been recommended to replace the GSM-R. Both of them adopted the conventional network architecture in which HST users inside the train communicate with outdoor base stations (BSs) directly. However, such an architecture results in high penetration losses when the signals travel into the carriages and leads to a spotty coverage, which will result in the handover failure or the high drop calls rate [4]. To overcome the above problems, the promising mobile relay station (MRS) solution has been proposed for future HST communication systems to solve the spotty coverage problem and mitigate ...

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Section: Parameters Influencing Radio Propagation Inside Tunnelmentioning

confidence: 99%

Channel measurements and models for high-speed train wireless communication systems in tunnel scenarios: a survey

Liu

Ghazal

Wang

et al. 2017

Sci. China Inf. Sci.

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“…These power densities will be clear later on. The first constraint in (27) ensures that the power density (or simply the power) is bounded, whereas in (29), it ensures that the power is higher than a given threshold.…”

Section: Optimum Field Excitation For Mode Excitationmentioning

confidence: 99%

“…The understanding and modeling of radio-wave propagation are essential steps toward deriving optimum radio communication systems and deployment in these scenarios. Various studies have been done considering several models to find or analyze radiation characteristics and positioning of antennas in tunnels [21,27,28] or simply to model the wave-propagation in these environments [13,15,19,34,41,57]. The models used to study the wave-propagation in these environments are limited due to the intrinsic principles, applicability and assumptions on which they are based.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Wave Propagation Modeling for Finding Antenna Specifications and Positions in Tunnels of Arbitrary Cross-Section

Castiblanco¹,

Seetharamdoo²,

Berbineau³

et al. 2013

Wave Propagation Theories and Applications

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“…Due to large distribution density of discrete antennas used in confined space, studying of the antenna and radio coverage becomes an unseparated problem. It is shown that antenna structure and installation location have significant effect on radio wave coverage [1][2][3]. However, available works usually deal with the antenna and wave propagation independently, few works consider antenna and radio wave propagation together as a whole system.…”

Section: Introductionmentioning

confidence: 99%

Research on the field coverage generated by antennas in confined space

Wang

Huang

2014

Proceedings of 2014 3rd Asia-Pacific Conference on Antennas and Propagation

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In this paper, field coverage generated by antenna locating in rectangular tunnel is studied. Ray tracing method is utilized to simulate the wave propagation in tunnel environment, the correctness of the method is validated by FDTD method and measurement. After verification, the influence of antenna position, beam direction and beam width on the field distribution is analyzed and discussed. The effect mechanism of antenna pattern on the field distribution in tunnel is studied. A hybrid approach which contains ray tracing method and particle swarm optimization (PSO) algorithm is proposed to optimize the antenna radiation pattern, orientation and location in the tunnel environment, the objective is to generate uniform field coverage in the tunnel.

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Effect of antenna on propagation characteristics of electromagnetic waves in tunnel environments

Cited by 14 publications

References 4 publications

Channel measurements and models for high-speed train wireless communication systems in tunnel scenarios: a survey

Channel measurements and models for high-speed train wireless communication systems in tunnel scenarios: a survey

Electromagnetic Wave Propagation Modeling for Finding Antenna Specifications and Positions in Tunnels of Arbitrary Cross-Section

Research on the field coverage generated by antennas in confined space

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