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Your search keyword '"QIU Jiahui"' showing total 3 results
Start Over Author "QIU Jiahui" Topic high-speed railway
3 results on '"QIU Jiahui"'

2. An Performance Study for Sectorised Antenna based Doppler Diversity in High-Speed Railway Communications

Author

Liu, Liu, Tao, Cheng, Qiu, Jiahui, and Chen, Houjin

Subjects
High-Speed Railway, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, Data_CODINGANDINFORMATIONTHEORY, lcsh:Electrical engineering. Electronics. Nuclear engineering, Doppler diversity, sectorised antenna, lcsh:TK1-9971, Computer Science::Information Theory
Abstract

The wireless channel of High-Speed Railway communication system is rapidly time-varying. The orthogonal frequency division multiplexing transmitting over this channel will be exposed to the intercarrier interference caused by large Doppler spread. The sectorised antenna can be employed for Doppler mitigation and obtaining Doppler diversity gain. In this paper the performance of this directional antenna is analyzed. The preferable partition scheme for the omnidirectional antenna and the optimal Doppler compensation frequency are addressed firstly. And the uncorrelated property of the signal received from the different sectorised antennas is demonstrated originally which can be utilized for Doppler diversity gain. Finally, it is proved by the simulation results that this architecture will allows us to achieve remarkable performance under high mobility conditions.

Published
2011

3. Position-Based Modeling for Wireless Channel on High-Speed Railway under a Viaduct at 2.35 GHz.

Author

Liu, Tao, Cheng, Qiu, Jiahui, Chen, Houjin, Yu, Li, Dong, Weihui, and Yuan, Yao

Subjects
WIRELESS communications, HIGH speed trains, DOPPLER effect, MOBILE communication systems, RAILROADS, RADIO transmitter fading, COLLISION broadening
Abstract

This paper presents a novel and practical study on the position-based radio propagation channel for High-Speed Railway by performing extensive measurements at 2.35 GHz in China. The specification on the path loss model is developed. In particular, small scale fading properties such as K-factor, Doppler frequency feature and time delay spread are parameterized, which show dynamic variances depending on the train location and the transceiver separation. Finally, the statistical position-based channel models are firstly established to characterize the High-Speed Railway channel, which significantly promotes the evaluation and verification of wireless communications in relative scenarios. [ABSTRACT FROM PUBLISHER]

Published
2012
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