Presentation 2017-05-26
[Technology Exhibit] Experimental Evaluation for QZSS Short Message SS-CDMA Communication
Rei Kawai, Hiroshi Oguma, Kei Ohya, Suguru Kameda, Noriharu Suematsu,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) We have proposed Spread Spectrum Code Division Multiple Access (SS-CDMA) short message communication using Quasi-Zenith Satellite System (QZSS) for safety confirmation system at the time of large disaster. The proposed system controls the transmission timing using highly accurate time and position information obtained from the QZSS. In order to realize the proposed system, we evaluate the time synchronization accuracy. As a prototype, when a time synchronization system with Network Time Protocol (NTP) server is constructed, it has a timing synchronization error of 1.07 μs. Since the target time synchronization accuracy of the prototype with NTP is not satisfied because of software delay, we design and implement a transmission timing control system that performs hardware processing without software delay using Field Programmable Gate Array (FPGA) in this work. As a result of evaluating the time synchronization accuracy, when the delay time for the transmission timing control is 330 ns, an error within 8 ns occur in the implemented system. Also, it is found that there is a proportional relationship between the delay time and the terminal time deviation.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) satellite communication / QZSS / GPS / SS-CDMA / FPGA
Paper # SR2017-15
Date of Issue 2017-05-18 (SR)

Conference Information
Committee SR
Conference Date 2017/5/25(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Tokyo big sight
Topics (in Japanese) (See Japanese page)
Topics (in English) Technical Exhibition, etc.
Chair Takeo Fujii(Univ. of Electro-Comm.)
Vice Chair Kenta Umebayashi(Tokyo Univ. of Agric. and Tech.) / Masayuki Ariyoshi(NEC) / Suguru Kameda(Tohoku Univ.)
Secretary Kenta Umebayashi(Shinshu Univ.) / Masayuki Ariyoshi(NICT) / Suguru Kameda
Assistant Kazuto Yano(ATR) / Mamiko Inamori(Tokai Univ.) / Hiroyuki Shiba(NTT) / Gia Khanh Tran(Tokyo Inst. of Tech.)

Paper Information
Registration To Technical Committee on Smart Radio
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) [Technology Exhibit] Experimental Evaluation for QZSS Short Message SS-CDMA Communication
Sub Title (in English) Construction of Transmission Timing Control System with FPGA
Keyword(1) satellite communication
Keyword(2) QZSS
Keyword(3) GPS
Keyword(4) SS-CDMA
Keyword(5) FPGA
1st Author's Name Rei Kawai
1st Author's Affiliation NIT, Toyama College(NIT, Toyama College)
2nd Author's Name Hiroshi Oguma
2nd Author's Affiliation NIT, Toyama College(NIT, Toyama College)
3rd Author's Name Kei Ohya
3rd Author's Affiliation Tohoku University(Tohoku Univ.)
4th Author's Name Suguru Kameda
4th Author's Affiliation Tohoku University(Tohoku Univ.)
5th Author's Name Noriharu Suematsu
5th Author's Affiliation Tohoku University(Tohoku Univ.)
Date 2017-05-26
Paper # SR2017-15
Volume (vol) vol.117
Number (no) SR-56
Page pp.pp.89-95(SR),
#Pages 7
Date of Issue 2017-05-18 (SR)