The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Ruisi He - One of the best experts on this subject based on the ideXlab platform.
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Measurements and Analysis of Propagation Channels in High-Speed Railway Viaducts
IEEE Transactions on Wireless Communications, 2013Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen Ding, Gongpu Wang, Andreas F. MolischAbstract:This paper reports (i) a set of measurements of the wireless propagation channel at 930 MHz, conducted along the "Zhengzhou-Xian" high-speed railway of China in various railway Viaduct scenarios, and (ii) an analysis and modeling of the small-scale and large-scale channel parameters based on those measurements. The environment can be categorized into four cases, covering Viaducts with different heights and in different suburban environments. Small values of fade depth, level crossing rates, and average fade duration are observed. Akaike's Information Criterion (AIC)-based evaluation indicates that the Ricean distribution is the best to describe small-scale amplitude fading. An analysis of the envelope autocovariance function shows that the coherence distance is less than 10 cm. The Ricean K-factor is modeled as a piecewise-linear function of distance. Moreover, a breakpoint path loss model is developed and shadow fading is investigated using the same break point as for the distance-dependent K-factor model. The Suzuki distribution is found to offer a good fit for the composite multipath/shadowing channels. We find that the Viaduct height H, together with the number of surrounding scatterers, significantly affects the small- and large-scale channel parameters. These results are applicable to both normal-speed and high-speed railways, and will be useful in the modeling of railway Viaduct channels and the design of railway wireless communication systems.
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measurements and analysis of short term fading behavior for high speed rail Viaduct scenario
International Conference on Communications, 2012Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:This paper presents a set of 930 MHz measurements conducted along the “Zhengzhou-Xi'an” high-speed rail of China, to characterize short-term fading behavior of the rail Viaduct scenario. Three measurement cases covering Viaducts with different heights are reported. The analysis results include fade depth (FD), Ricean distribution fit and K-factor modeling, level crossing rates (LCR), and average fade duration (AFD). A small value of fade depth, around 15 dB, is observed. The Ricean distribution offers good fit in this line-of-sight (LOS) propagation scenario, and the K-factor estimated using moment-based method is modeled as a piecewise function, whose break point equals to the reference distance. It is found that the Viaduct height H greatly affects the severity of fading and the feature parameters. The results are applicable to the design of high-speed rail communication systems and the modeling of the rail Viaduct fading channels.
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An Empirical Path Loss Model and Fading Analysis for High-Speed Railway Viaduct Scenarios
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:Based on the narrowband 930-MHz measurements taken along the “Zhengzhou-Xi'an” high-speed railway in China, an empirical path loss model is proposed. It is applicable to high-speed railway Viaduct scenarios, considering the influences of Viaduct height H and base station antenna relative height h, which are not well-covered by existing large-scale models. The path loss exponents are investigated, based on which the influence of Viaduct on propagation is discussed. The fading depth up to 15.96 dB and the Ricean K -factor with mean value of 3.79 dB are obtained.
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path loss measurements and analysis for high speed railway Viaduct scene
International Conference on Wireless Communications and Mobile Computing, 2010Co-Authors: Ruisi He, Zhangdui Zhong, Bo AiAbstract:This paper presents the results of path loss measurements in "Zhengzhou-Xi'an" high-speed railway environment at 930 MHz band. A transmitter directional antenna height of 20~30 meters above the rail surface and a receiver omni-directional antenna height of 3.5 meters were used on the high-speed Viaducts height of 10~30 meters above the ground. An automatic acquisition system was utilized in the measurements. The model makes distinctions among different terrain. The results of measurements provide practical values for path loss exponent and standard deviation of shadowing affected by the Viaduct factor in suburban, open area, mountain area and urban propagation regions where the high-speed trains travel. Based on the measurement data, the empirical path loss model was developed, which could be used for predicting the path loss for the future railway communication systems, and provide the facilities for network optimization.
Bo Ai - One of the best experts on this subject based on the ideXlab platform.
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Measurement based ray tracer calibration and channel analysis for high-speed railway Viaduct scenario at 93.2 GHz
2017 IEEE International Symposium on Antennas and Propagation & USNC URSI National Radio Science Meeting, 2017Co-Authors: Bo Ai, Zhangdui Zhong, Danping He, Ke Guan, Li TianAbstract:In this paper, ray tracer (RT) is employed to simulate the propagation in a high-speed railway Viaduct scenario at the frequency of 93.2 GHz. By comparing the path loss between simulation and measurement, the permittivity and loss tangent of concrete which is the material of Viaduct are calibrated in the ray tracer. The average error between calibration result and measurement is 0.2 dB. The calibrated and validated RT is used to study propagation channel in Viaduct scenarios. Rician K-Factor and root-mean-square (RMS) delay spread are further analyzed, from which a conclusion that the typical structure of Viaduct and the application of horn antenna lead to a small value of Rician K-Factor and RMS delay spread is drawn.
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Measurements and Analysis of Propagation Channels in High-Speed Railway Viaducts
IEEE Transactions on Wireless Communications, 2013Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen Ding, Gongpu Wang, Andreas F. MolischAbstract:This paper reports (i) a set of measurements of the wireless propagation channel at 930 MHz, conducted along the "Zhengzhou-Xian" high-speed railway of China in various railway Viaduct scenarios, and (ii) an analysis and modeling of the small-scale and large-scale channel parameters based on those measurements. The environment can be categorized into four cases, covering Viaducts with different heights and in different suburban environments. Small values of fade depth, level crossing rates, and average fade duration are observed. Akaike's Information Criterion (AIC)-based evaluation indicates that the Ricean distribution is the best to describe small-scale amplitude fading. An analysis of the envelope autocovariance function shows that the coherence distance is less than 10 cm. The Ricean K-factor is modeled as a piecewise-linear function of distance. Moreover, a breakpoint path loss model is developed and shadow fading is investigated using the same break point as for the distance-dependent K-factor model. The Suzuki distribution is found to offer a good fit for the composite multipath/shadowing channels. We find that the Viaduct height H, together with the number of surrounding scatterers, significantly affects the small- and large-scale channel parameters. These results are applicable to both normal-speed and high-speed railways, and will be useful in the modeling of railway Viaduct channels and the design of railway wireless communication systems.
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measurements and analysis of short term fading behavior for high speed rail Viaduct scenario
International Conference on Communications, 2012Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:This paper presents a set of 930 MHz measurements conducted along the “Zhengzhou-Xi'an” high-speed rail of China, to characterize short-term fading behavior of the rail Viaduct scenario. Three measurement cases covering Viaducts with different heights are reported. The analysis results include fade depth (FD), Ricean distribution fit and K-factor modeling, level crossing rates (LCR), and average fade duration (AFD). A small value of fade depth, around 15 dB, is observed. The Ricean distribution offers good fit in this line-of-sight (LOS) propagation scenario, and the K-factor estimated using moment-based method is modeled as a piecewise function, whose break point equals to the reference distance. It is found that the Viaduct height H greatly affects the severity of fading and the feature parameters. The results are applicable to the design of high-speed rail communication systems and the modeling of the rail Viaduct fading channels.
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An Empirical Path Loss Model and Fading Analysis for High-Speed Railway Viaduct Scenarios
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:Based on the narrowband 930-MHz measurements taken along the “Zhengzhou-Xi'an” high-speed railway in China, an empirical path loss model is proposed. It is applicable to high-speed railway Viaduct scenarios, considering the influences of Viaduct height H and base station antenna relative height h, which are not well-covered by existing large-scale models. The path loss exponents are investigated, based on which the influence of Viaduct on propagation is discussed. The fading depth up to 15.96 dB and the Ricean K -factor with mean value of 3.79 dB are obtained.
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path loss measurements and analysis for high speed railway Viaduct scene
International Conference on Wireless Communications and Mobile Computing, 2010Co-Authors: Ruisi He, Zhangdui Zhong, Bo AiAbstract:This paper presents the results of path loss measurements in "Zhengzhou-Xi'an" high-speed railway environment at 930 MHz band. A transmitter directional antenna height of 20~30 meters above the rail surface and a receiver omni-directional antenna height of 3.5 meters were used on the high-speed Viaducts height of 10~30 meters above the ground. An automatic acquisition system was utilized in the measurements. The model makes distinctions among different terrain. The results of measurements provide practical values for path loss exponent and standard deviation of shadowing affected by the Viaduct factor in suburban, open area, mountain area and urban propagation regions where the high-speed trains travel. Based on the measurement data, the empirical path loss model was developed, which could be used for predicting the path loss for the future railway communication systems, and provide the facilities for network optimization.
Zhangdui Zhong - One of the best experts on this subject based on the ideXlab platform.
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Measurement based ray tracer calibration and channel analysis for high-speed railway Viaduct scenario at 93.2 GHz
2017 IEEE International Symposium on Antennas and Propagation & USNC URSI National Radio Science Meeting, 2017Co-Authors: Bo Ai, Zhangdui Zhong, Danping He, Ke Guan, Li TianAbstract:In this paper, ray tracer (RT) is employed to simulate the propagation in a high-speed railway Viaduct scenario at the frequency of 93.2 GHz. By comparing the path loss between simulation and measurement, the permittivity and loss tangent of concrete which is the material of Viaduct are calibrated in the ray tracer. The average error between calibration result and measurement is 0.2 dB. The calibrated and validated RT is used to study propagation channel in Viaduct scenarios. Rician K-Factor and root-mean-square (RMS) delay spread are further analyzed, from which a conclusion that the typical structure of Viaduct and the application of horn antenna lead to a small value of Rician K-Factor and RMS delay spread is drawn.
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Measurements and Analysis of Propagation Channels in High-Speed Railway Viaducts
IEEE Transactions on Wireless Communications, 2013Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen Ding, Gongpu Wang, Andreas F. MolischAbstract:This paper reports (i) a set of measurements of the wireless propagation channel at 930 MHz, conducted along the "Zhengzhou-Xian" high-speed railway of China in various railway Viaduct scenarios, and (ii) an analysis and modeling of the small-scale and large-scale channel parameters based on those measurements. The environment can be categorized into four cases, covering Viaducts with different heights and in different suburban environments. Small values of fade depth, level crossing rates, and average fade duration are observed. Akaike's Information Criterion (AIC)-based evaluation indicates that the Ricean distribution is the best to describe small-scale amplitude fading. An analysis of the envelope autocovariance function shows that the coherence distance is less than 10 cm. The Ricean K-factor is modeled as a piecewise-linear function of distance. Moreover, a breakpoint path loss model is developed and shadow fading is investigated using the same break point as for the distance-dependent K-factor model. The Suzuki distribution is found to offer a good fit for the composite multipath/shadowing channels. We find that the Viaduct height H, together with the number of surrounding scatterers, significantly affects the small- and large-scale channel parameters. These results are applicable to both normal-speed and high-speed railways, and will be useful in the modeling of railway Viaduct channels and the design of railway wireless communication systems.
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measurements and analysis of short term fading behavior for high speed rail Viaduct scenario
International Conference on Communications, 2012Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:This paper presents a set of 930 MHz measurements conducted along the “Zhengzhou-Xi'an” high-speed rail of China, to characterize short-term fading behavior of the rail Viaduct scenario. Three measurement cases covering Viaducts with different heights are reported. The analysis results include fade depth (FD), Ricean distribution fit and K-factor modeling, level crossing rates (LCR), and average fade duration (AFD). A small value of fade depth, around 15 dB, is observed. The Ricean distribution offers good fit in this line-of-sight (LOS) propagation scenario, and the K-factor estimated using moment-based method is modeled as a piecewise function, whose break point equals to the reference distance. It is found that the Viaduct height H greatly affects the severity of fading and the feature parameters. The results are applicable to the design of high-speed rail communication systems and the modeling of the rail Viaduct fading channels.
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An Empirical Path Loss Model and Fading Analysis for High-Speed Railway Viaduct Scenarios
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:Based on the narrowband 930-MHz measurements taken along the “Zhengzhou-Xi'an” high-speed railway in China, an empirical path loss model is proposed. It is applicable to high-speed railway Viaduct scenarios, considering the influences of Viaduct height H and base station antenna relative height h, which are not well-covered by existing large-scale models. The path loss exponents are investigated, based on which the influence of Viaduct on propagation is discussed. The fading depth up to 15.96 dB and the Ricean K -factor with mean value of 3.79 dB are obtained.
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path loss measurements and analysis for high speed railway Viaduct scene
International Conference on Wireless Communications and Mobile Computing, 2010Co-Authors: Ruisi He, Zhangdui Zhong, Bo AiAbstract:This paper presents the results of path loss measurements in "Zhengzhou-Xi'an" high-speed railway environment at 930 MHz band. A transmitter directional antenna height of 20~30 meters above the rail surface and a receiver omni-directional antenna height of 3.5 meters were used on the high-speed Viaducts height of 10~30 meters above the ground. An automatic acquisition system was utilized in the measurements. The model makes distinctions among different terrain. The results of measurements provide practical values for path loss exponent and standard deviation of shadowing affected by the Viaduct factor in suburban, open area, mountain area and urban propagation regions where the high-speed trains travel. Based on the measurement data, the empirical path loss model was developed, which could be used for predicting the path loss for the future railway communication systems, and provide the facilities for network optimization.
Zhigang Yang - One of the best experts on this subject based on the ideXlab platform.
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Effect of double line Viaduct noise barrier height on aerodynamic characteristics of high speed train
2011 International Conference on Consumer Electronics Communications and Networks (CECNet), 2011Co-Authors: Zhigang YangAbstract:Viaducts are widely built in the modern high speed railway system. The noise barrier will have some effect on the aerodynamic characteristics of the high speed train running on the double line Viaduct. It is essential that the research on this effect will be made. It will provide some engineering reference for the high speed railway construction. Using the CFD(Computational Fluid Dynamics) soft Fluent, the effect of double line Viaduct noise barrier height on the aerodynamic characteristic of the high speed train has been researched. When the high speed train runs on the windward, the aerodynamic forces and moments acting on the train are analyzed. The simulation results show that the aerodynamic forces and moments on the high speed train have some discipline with the changing of the noise barrier height. The side force coefficient decreases gradually in the head train, middle train and the rear train with the height increase of the noise barrier. The rolling moment of the head train reaches the maximum among the whole train and decreases gradually with the increase of the noise barrier height.
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Research on the Noise Barrier Height Change of the Monoline Viaduct Affecting the Aerodynamic Characteristic of High Speed Train
2010 International Conference on Intelligent Computation Technology and Automation, 2010Co-Authors: Zhigang YangAbstract:Viaducts are widely used in the modern high speed railway construction. In order to ensure the high speed train running safely, passenger's comfort and environment protecting, it is essential that the aerodynamic characteristic of the high speed train moving on the Viaduct will been researched. These researches will provide some engineering reference for the high speed railway construction. The studying methods of the aerodynamic characteristic include theoretical computing, numerical simulation and experimentation. Using the commercial soft Fluent, the numerical research on the noise barrier height change of the monoline Viaduct having effect on the aerodynamic characteristic of the high speed train has been made. The calculation precision has been obtained with the suitable meshing, selecting appropriate turbulent model and adopting the right boundary conditions. The aerodynamic forces and moments acting on the high speed train are analysed. The simulation results show that the aerodynamic forces and moments on the high speed train have some discipline with the height change of the noise barrier. Finally, the relative best aerodynamic height of the noise barrier is found by optimization.
Jianwen Ding - One of the best experts on this subject based on the ideXlab platform.
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Measurements and Analysis of Propagation Channels in High-Speed Railway Viaducts
IEEE Transactions on Wireless Communications, 2013Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen Ding, Gongpu Wang, Andreas F. MolischAbstract:This paper reports (i) a set of measurements of the wireless propagation channel at 930 MHz, conducted along the "Zhengzhou-Xian" high-speed railway of China in various railway Viaduct scenarios, and (ii) an analysis and modeling of the small-scale and large-scale channel parameters based on those measurements. The environment can be categorized into four cases, covering Viaducts with different heights and in different suburban environments. Small values of fade depth, level crossing rates, and average fade duration are observed. Akaike's Information Criterion (AIC)-based evaluation indicates that the Ricean distribution is the best to describe small-scale amplitude fading. An analysis of the envelope autocovariance function shows that the coherence distance is less than 10 cm. The Ricean K-factor is modeled as a piecewise-linear function of distance. Moreover, a breakpoint path loss model is developed and shadow fading is investigated using the same break point as for the distance-dependent K-factor model. The Suzuki distribution is found to offer a good fit for the composite multipath/shadowing channels. We find that the Viaduct height H, together with the number of surrounding scatterers, significantly affects the small- and large-scale channel parameters. These results are applicable to both normal-speed and high-speed railways, and will be useful in the modeling of railway Viaduct channels and the design of railway wireless communication systems.
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measurements and analysis of short term fading behavior for high speed rail Viaduct scenario
International Conference on Communications, 2012Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:This paper presents a set of 930 MHz measurements conducted along the “Zhengzhou-Xi'an” high-speed rail of China, to characterize short-term fading behavior of the rail Viaduct scenario. Three measurement cases covering Viaducts with different heights are reported. The analysis results include fade depth (FD), Ricean distribution fit and K-factor modeling, level crossing rates (LCR), and average fade duration (AFD). A small value of fade depth, around 15 dB, is observed. The Ricean distribution offers good fit in this line-of-sight (LOS) propagation scenario, and the K-factor estimated using moment-based method is modeled as a piecewise function, whose break point equals to the reference distance. It is found that the Viaduct height H greatly affects the severity of fading and the feature parameters. The results are applicable to the design of high-speed rail communication systems and the modeling of the rail Viaduct fading channels.
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An Empirical Path Loss Model and Fading Analysis for High-Speed Railway Viaduct Scenarios
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Ruisi He, Zhangdui Zhong, Bo Ai, Jianwen DingAbstract:Based on the narrowband 930-MHz measurements taken along the “Zhengzhou-Xi'an” high-speed railway in China, an empirical path loss model is proposed. It is applicable to high-speed railway Viaduct scenarios, considering the influences of Viaduct height H and base station antenna relative height h, which are not well-covered by existing large-scale models. The path loss exponents are investigated, based on which the influence of Viaduct on propagation is discussed. The fading depth up to 15.96 dB and the Ricean K -factor with mean value of 3.79 dB are obtained.
