Research on High-Speed Mobile Radio Large-scale Propagation Characteristics and Interference
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studied on the followed two aspects: the small-scale fading and the large scale fading. Small-scale fading is used to describe rapid change of the received signal magnitude within short-range (wavelength level) or a short period of time. Comparatively speaking, largescale decline depending upon topography, terrain, is mainly used to describe the signal intensity variations in long distance between the transmitter and receiver. It is often adopted to classify the propagation scenarios, measure data according to the specific scenarios, and then extract statistical distributions and channel parameters by measurements. The work of this paper is based on the tests of a highspeed vehicle experimental section in China. Not only the large scale fading characteristics, including path loss, path loss index, standard deviations, but also the influence of radio frequency interference (RFI) on GSM-R band is analyzed in this paper. The main RFI effects arise from the high voltage spark breakdown when the pantograph is raised or lowered and high current arcing during operation. This study and the results are helpful for the development of land high-speed mobile communication. The remainder of this paper is organized as follows. After the introduction, In Section II the experiment is presented, including experiment setup, experiment instruments, and data processing and analyzing. In Section III, the characteristics of high speed mobile propagation, such as path loss, shadow fading standard deviation, are given. Besides, the impact of the interference of the spark breakdown pulse from pantograph-catenary on GSM-R band is discussed in Section IV. Finally, concluding remarks are given in Section V. 2 EXPERIMENT
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INTRODUCTION
Along with the rapid development of high-speed vehicle, higher demand has been asked for research on the high-speed radio propagation characteristics. The existing mobile radio propagation research, no matter what kind of propagation environment, most of the propagation models are based on automobile and low-speed (<=200km/h). Study on the high speed vehicle radio propagation characteristics mainly focused on the propagation characteristics in the carriage[Zuazola2009][ Nianzu2009]. The latest measurement and research on high-speed mobile radio large-scale fading features mostly concentrated in the 2Ghz and above[Hattori1999][Wiesbeck2007] [Kyösti2007] [Ohta04]]; the measured data for the characteristics outside the carriage, especially 900MHz band, are still rarely [Abrishamkar2000]. It has been widely understood that specific geographical environments of wireless communications, such as topography, terrain, buildings, trees, vehicles even pedestrians can have impact on radio propagation and radio propagation has a significant impact on the performance of wireless communication systems. The impact on highspeed wireless communication systems is even more important due to high velocity, increased data rate, adaptively, QoS, etc. Because of the major influence on the system performance and complexity, radio channel models have to be more accurate than in earlier systems. In general, radio propagation is
Research on High-Speed Mobile Radio Large-scale Propagation Characterin1,2，WEN Ying-hong1，TAN Zhen-hui2
Abstract Study of high speed radio wave characteristics is significant for development of High-speed mobile communication technology ． According to the mobile radio propagation characteristics, a method of measurement of these characteristics is proposed in this paper ． Based on the sophisticated measurement instruments and the virtual instrument technology, the high speed measurement system is established and conducted at one high-speed channel pilot section in China. Through the test and measured data, the propagation characteristic such as slow fading pass loss exponent and standard deviation of shadow fading, etc is obtained. Furthermore, the influence of interference from pantograph-catenary disconnection discharge on high-speed mobile channel is analyzed. Keywords- High-Speed; Large-Scale Fading; Radio Propagation Characteristics; Pantograph-Catenary Noise
2.1 Experiment setup The experiment is done in a carriage of high-speed vehicle on a test line in China. The wireless control connection to the vehicles is arranged by using GSM-R, whose antennas are mounted on the ceiling of the carriage. The link between the fixed network (GSM-R base station) and the moving network (vehicle) is typically a LOS type. There is a track accompanied
studied on the followed two aspects: the small-scale fading and the large scale fading. Small-scale fading is used to describe rapid change of the received signal magnitude within short-range (wavelength level) or a short period of time. Comparatively speaking, largescale decline depending upon topography, terrain, is mainly used to describe the signal intensity variations in long distance between the transmitter and receiver. It is often adopted to classify the propagation scenarios, measure data according to the specific scenarios, and then extract statistical distributions and channel parameters by measurements. The work of this paper is based on the tests of a highspeed vehicle experimental section in China. Not only the large scale fading characteristics, including path loss, path loss index, standard deviations, but also the influence of radio frequency interference (RFI) on GSM-R band is analyzed in this paper. The main RFI effects arise from the high voltage spark breakdown when the pantograph is raised or lowered and high current arcing during operation. This study and the results are helpful for the development of land high-speed mobile communication. The remainder of this paper is organized as follows. After the introduction, In Section II the experiment is presented, including experiment setup, experiment instruments, and data processing and analyzing. In Section III, the characteristics of high speed mobile propagation, such as path loss, shadow fading standard deviation, are given. Besides, the impact of the interference of the spark breakdown pulse from pantograph-catenary on GSM-R band is discussed in Section IV. Finally, concluding remarks are given in Section V. 2 EXPERIMENT
1
INTRODUCTION
Along with the rapid development of high-speed vehicle, higher demand has been asked for research on the high-speed radio propagation characteristics. The existing mobile radio propagation research, no matter what kind of propagation environment, most of the propagation models are based on automobile and low-speed (<=200km/h). Study on the high speed vehicle radio propagation characteristics mainly focused on the propagation characteristics in the carriage[Zuazola2009][ Nianzu2009]. The latest measurement and research on high-speed mobile radio large-scale fading features mostly concentrated in the 2Ghz and above[Hattori1999][Wiesbeck2007] [Kyösti2007] [Ohta04]]; the measured data for the characteristics outside the carriage, especially 900MHz band, are still rarely [Abrishamkar2000]. It has been widely understood that specific geographical environments of wireless communications, such as topography, terrain, buildings, trees, vehicles even pedestrians can have impact on radio propagation and radio propagation has a significant impact on the performance of wireless communication systems. The impact on highspeed wireless communication systems is even more important due to high velocity, increased data rate, adaptively, QoS, etc. Because of the major influence on the system performance and complexity, radio channel models have to be more accurate than in earlier systems. In general, radio propagation is
Research on High-Speed Mobile Radio Large-scale Propagation Characterin1,2，WEN Ying-hong1，TAN Zhen-hui2
Abstract Study of high speed radio wave characteristics is significant for development of High-speed mobile communication technology ． According to the mobile radio propagation characteristics, a method of measurement of these characteristics is proposed in this paper ． Based on the sophisticated measurement instruments and the virtual instrument technology, the high speed measurement system is established and conducted at one high-speed channel pilot section in China. Through the test and measured data, the propagation characteristic such as slow fading pass loss exponent and standard deviation of shadow fading, etc is obtained. Furthermore, the influence of interference from pantograph-catenary disconnection discharge on high-speed mobile channel is analyzed. Keywords- High-Speed; Large-Scale Fading; Radio Propagation Characteristics; Pantograph-Catenary Noise
2.1 Experiment setup The experiment is done in a carriage of high-speed vehicle on a test line in China. The wireless control connection to the vehicles is arranged by using GSM-R, whose antennas are mounted on the ceiling of the carriage. The link between the fixed network (GSM-R base station) and the moving network (vehicle) is typically a LOS type. There is a track accompanied
