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Paper Abstract and Keywords
Presentation 2006-05-18 13:30
Measurements of wideband propagation characteristics in railway tunnel
Yutaka Imaizumi, Kiyoshi Kobayashi, Hiroaki Tsunoda, Kohei Ohata (NTT), Masakatsu Yoshizawa, Seiji Imai (JR-CENTRAL) SAT2006-1
Abstract (in Japanese) (See Japanese page) 
(in English) We are examining the application of a Ku-band mobile satellite communication system as a means to offer broadband communication services, for example, the Internet connection service, to passengers in a train. To secure uninterrupted communication using the satellite, we are considering application of terrestrial repeaters, generally known as gap-fillers, as shadowing countermeasure technologies against longer obstacles such as tunnels. To design the gap-filler for the train that runs at high speed in the tunnel, the wideband propagation characteristic in the tunnel should be clarified. This paper describes the measured results and analysis on the wideband propagation characteristic in the railway tunnel. The results are as follows. 1) The degradation of the reception level doesn't depend on the tunnel shape. 2) The propagation loss in the vicinity of the transmission antenna is smaller than the free space path loss. 3) The degradation of the reception level by the presence of the oncoming train is the sum of the degradation due to the tunnel itself and the degradation due to the train. 4) The delay spread is insignificant when the high gain antenna is used for the receiving antenna.
Keyword (in Japanese) (See Japanese page) 
(in English) Railway / Tunnel / Wideband propagation / Delay spread / / / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 39, SAT2006-1, pp. 1-6, May 2006.
Paper # SAT2006-1 
Date of Issue 2006-05-11 (SAT) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee AP SAT  
Conference Date 2006-05-18 - 2006-05-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Kagoshima Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Communications and Antennas and Propagation 
Paper Information
Registration To SAT 
Conference Code 2006-05-AP-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Measurements of wideband propagation characteristics in railway tunnel 
Sub Title (in English)  
Keyword(1) Railway  
Keyword(2) Tunnel  
Keyword(3) Wideband propagation  
Keyword(4) Delay spread  
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1st Author's Name Yutaka Imaizumi  
1st Author's Affiliation NipponTelegraph and Telephone Corporation (NTT)
2nd Author's Name Kiyoshi Kobayashi  
2nd Author's Affiliation NipponTelegraph and Telephone Corporation (NTT)
3rd Author's Name Hiroaki Tsunoda  
3rd Author's Affiliation NipponTelegraph and Telephone Corporation (NTT)
4th Author's Name Kohei Ohata  
4th Author's Affiliation NipponTelegraph and Telephone Corporation (NTT)
5th Author's Name Masakatsu Yoshizawa  
5th Author's Affiliation Central Japan Railway Company (JR-CENTRAL)
6th Author's Name Seiji Imai  
6th Author's Affiliation Central Japan Railway Company (JR-CENTRAL)
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Speaker Author-1 
Date Time 2006-05-18 13:30:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2006-1 
Volume (vol) vol.106 
Number (no) no.39 
Page pp.1-6 
#Pages
Date of Issue 2006-05-11 (SAT) 


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