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Paper Abstract and Keywords
Presentation 2014-01-09 13:50
[Invited Talk] QZSS Location and Short Message Communication System against Big Disasters
Akinori Taira, Yuji Miyake, Suguru Kameda, Noriharu Suematsu, Tadashi Takagi, Kazuo Tsubouchi (Tohoku Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) When great disaster occurs, many terrestrial infrastructures are seriously damaged. Thus satellite communication has important roles to keep a minimum reliable connection. Quasi-Zenith Satellite System (QZSS) is expected to provide a high accurate positioning service and allows two-way communication which includes the terminal location and short messages. We propose SS-CDMA scheme which realizes the direct access from terminals to the satellite and many users simultaneous transmission using large spreading factor SS-codes. In this system, the keeping orthogonality among users in time and fre-quency domain is the most important issue. All terminals synchronize own clock and frequency to Quasi-Zenith Satellite (QZS). In this paper, the influence of residual timing jitter and frequency offset is evaluated with computer simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) Quasi-Zenith Satellite System (QZSS) / satellite communication / Global Positioning System (GPS) / Spread Spectrum Code Division Multiple Access (SS-CDMA) / Automatic Frequency Control (AFC) / timing synchronization / /  
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Conference Information
Committee AP  
Conference Date 2014-01-08 - 2014-01-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Le Quy Don Technical University (Hanoi, Vietnam) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Vietnam-Japan International Symposium on Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2014-01-AP 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) QZSS Location and Short Message Communication System against Big Disasters 
Sub Title (in English)  
Keyword(1) Quasi-Zenith Satellite System (QZSS)  
Keyword(2) satellite communication  
Keyword(3) Global Positioning System (GPS)  
Keyword(4) Spread Spectrum Code Division Multiple Access (SS-CDMA)  
Keyword(5) Automatic Frequency Control (AFC)  
Keyword(6) timing synchronization  
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Keyword(8)  
1st Author's Name Akinori Taira  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Yuji Miyake  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Suguru Kameda  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Noriharu Suematsu  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
5th Author's Name Tadashi Takagi  
5th Author's Affiliation Tohoku University (Tohoku Univ.)
6th Author's Name Kazuo Tsubouchi  
6th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2014-01-09 13:50:00 
Presentation Time 30 minutes 
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