Estimation for Small-Scale Fading Characteristics of Rf Wireless Link Under Railway Communication Environment Using Integrative Modeling Technique.

Pu, Shi; Wang, Junhong; Zhang, and Zhan

doi:10.2528/pier10042806

Cited by 9 publications

(10 citation statements)

References 28 publications

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“…There are totally four quarterwavelength monopole antennas mounted upon the locomotive along the central line in y-direction. The monopole model of the locomotive antennas used here is composed of the monopole arm part by using thin-wire approximation and the coaxial line part by taking TEM-mode iteration, which is the same as in [2]. In the coverage configuration as shown in Figure 1(a), the BSA installed in tunnel for relay is a half-wavelength dipole antenna.…”

Section: Theory and Methodsmentioning

confidence: 99%

“…Two types of the wireless RF link based on LCX or BSAs are both discussed in this paper. Taking the downlink for example, the entire wireless RF link described here would be divided into the following three parts [1], [2]: the radiating of RF signal by LCX or BSA, the propagating of the signal wave in tunnel loaded with train body and its environment, and the receiving of the RF signal by train antenna. Many available works have concentrated on the radio-wave propagation in tunnels by different kinds of prediction models.…”

Section: Introduction 1)mentioning

confidence: 99%

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Integrative Modeling of Wireless RF Links for Train-to-Wayside Communication in Railway Tunnel

Pu¹,

Hao²

2012

Journal of the Korea Industrial Information Systems Research

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In railway tunnel environment, the reliability of a high-data-rate and real-time train-to-wayside communication should be maintained especially when high-speed train moves along the track. In China and Europe, the communication frequency around 900 MHz is widely used for railway applications. At this carrier frequency band, both of the solutions based on continuously laid leaky coaxial cable (LCX) and discretely installed base-station antennas (BSAs), are applied in tunnel radio coverage. Many available works have concentrated on the radio-wave propagation in tunnels by different kinds of prediction models. Most of them solve this problem as natural propagation in a relatively large hollow waveguide, by neglecting the transmitting/receiving (Tx/Rx) components. However, within such confined areas like railway tunnels especially loaded with train, the complex communication environment becomes an important factor that would affect the quality of the signal transmission. This paper will apply a full-wave numerical method to this case, for considering the BSA or LCX, train antennas and their interacted environments, such as the locomotive body, overhead line for power supply, locomotive pantograph, steel rails, ballastless track, tunnel walls, etc.. Involving finite-difference time-domain (FDTD) method and uni-axial anisotropic perfectly matched layer (UPML) technique, the entire wireless RF downlinks of BSA and LCX to tunnel space to train antenna are precisely modeled (so-called integrative modeling technique, IMT). When exciting the BSA and LCX separately, the field distributions of some cross-sections in a rectangular tunnel are presented. It can be found that the influence of the locomotive body and other tunnel environments is very significant. The field coverage on the locomotive roof plane where the train antennas mounted, seems more homogenous when the side-laying position of the BSA or LCX is much higher. Also, much smoother field coverage solution is achieved by choosing LCX for its characteristic of more homogenous electromagnetic wave radiation.

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Section: Theory and Methodsmentioning

confidence: 99%

Section: Introduction 1)mentioning

confidence: 99%

Integrative Modeling of Wireless RF Links for Train-to-Wayside Communication in Railway Tunnel

Pu¹,

Hao²

2012

Journal of the Korea Industrial Information Systems Research

Self Cite

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“…Phaiboon and Phokharatkul [24] using modified Xia model investigated 900&1800 MHz measurements. Pu et al [25] estimated small scale fading characteristics of RF wireless link under railway communication environment. For next generation wide band communication systems spectrum efficiency could be increased, and signal quality could be improved with the implementation of co-ordination scheme among base stations [26].…”

Section: Break Point Distancesmentioning

confidence: 99%

EXPERIMENTAL INVESTIGATION OF GSM 900 MHz RESULTS OVER NORTHERN INDIA WITH AWAS ELECTROMAGNETIC CODE AND OTHER PREDICTION MODELS

Prasad¹,

Dalela²,

Misra³

2012

PIER

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Abstract-Recent trends in propagation modeling indicate the study of mobile radio propagation modeling with the help of electromagnetic formulations which traditionally has been explained with empirical methods. These empirical methods were preferred by the cellular operators in their radio planning tools due to their ease of implementation and less time consumption. In the present study, AWAS electromagnetic code and conventional prediction methods have been employed to explain the observed results of ten base stations mainly in the near field zones of GSM 900 MHz band situated in the urban and suburban regions around Delhi in India. The suitability of the above models in terms of prediction errors and standard deviations are presented. Path loss exponents deduced from the observed data have been explained by Sommerfeld's formulations.

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“…The prediction of microwave attenuation [22][23][24][25][26][27][28][29][30][31][32][33] is important in the analysis of wireless systems. Signal propagation is strongly affected by the dissipation of the power radiated by the transmitter that is related to the distance between the communicating nodes.…”

Section: An Application In Radio Wave Propagationmentioning

confidence: 99%

A Geometric Method for Computing the Nodal Distance Distribution in Mobile Networks

Baltzis

2011

PIER

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Abstract-This paper presents a geometrically based method for the calculation of the node-to-node distance distribution function in circular-shaped networks. In our approach, this function is obtained from the intersection volume of a sphere and an ellipsoid. The method is valid for both overlapping and non-overlapping networks. Simulation results and comparisons with methods in the literature demonstrate the efficacy of the approach. The relation between networks geometric parameters and distance statistics is explored. As an application example, we model distance-dependent path loss and investigate the impact of channel characteristics and networks size on signal absorption. The aforementioned model is a useful and lowcomplexity tool for system-level modeling and simulation of mobile communication systems.

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Estimation for Small-Scale Fading Characteristics of Rf Wireless Link Under Railway Communication Environment Using Integrative Modeling Technique.

Cited by 9 publications

References 28 publications

Integrative Modeling of Wireless RF Links for Train-to-Wayside Communication in Railway Tunnel

Integrative Modeling of Wireless RF Links for Train-to-Wayside Communication in Railway Tunnel

EXPERIMENTAL INVESTIGATION OF GSM 900 MHz RESULTS OVER NORTHERN INDIA WITH AWAS ELECTROMAGNETIC CODE AND OTHER PREDICTION MODELS

A Geometric Method for Computing the Nodal Distance Distribution in Mobile Networks

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