System-Level Evaluation of Next-Generation Radio Communication System for Train Operation Services (original) (raw)
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I would like to start by thanking my Ph.D directors, Mme Marion BER-BINEAU and M. Iyad DAYOUB, for their support during my Ph.D study. The realisation of this work could have not been possible without their guidance. I exploit this opportunity to thank my scholorship donors, IFSTTAR and the region "Hauts de France" for their financial support that allowed me to conduct my Ph.D. I would like to thank M. Michel TERRE and Mme Karine AMIS for accepting to review and evaluate the thesis. Also, I thank M. Kosai RAOOF and M. Loïc Brunel for accepting to be members of the jury.
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Because of the measurement restriction and measurement efficiency issues of applying conventional channel sounders in high-speed railway (HSR) scenarios, railway network based channel measurement methods have recently attracted much attention. A method that employs long-term evolution (LTE) railway networks to achieve channel measurements for HSR communications is presented. The principle of the method is described and the channel sounding performance is analyzed. The method is implemented by a novel measurement system which can enable the collection of time-frequency-space channel data. Based on the system, field measurements that consider both direct and relay coverage schemes are conducted on Beijing to Tianjin HSR in China. Measurement data are partitioned into single-link case in which the common channel parameters can be extracted and multi-link case in which the correlation between different links can be characterized. Finally, statistical results, involving path loss (PL), Ricean K-factor, root mean square (RMS) delay spread (DS), single-link spatial correlation (SC) and multi-link SC, are presented, which not only confirm the viability of the proposed method but also provide realistic channel characteristics available for the study of both existing HSR LTE systems and future HSR dedicated systems.