Presentation 2021-02-19
Signal Decomposition of Collided Packets Employing Highly Accurate Estimation of Doppler Frequencies in Space-based AIS
Kohei Nozaki, Yuwa Takanezawa, Yuyuan Chang, Kazuhiko Fukawa, Daichi Hirahara,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) The automatic identification system (AIS) aims at communications among ships or between base stations on seaside and ships near the shore. On the other hand, Japan Aerospace Exploration Agency (JAXA) has conducted an experiment named Space based AIS Experiment (SPAISE), which enables satellites to observe AIS signals that are transmitted from ships across the open ocean and affected by Doppler shift. This experiment has shown that conventional and simple detection schemes cannot successfully receive AIS packets by satellites, because the wide coverage of the satellites causes a collision of several AIS signal packets. To cope with such a problem, a multi-user detection scheme such as PIC (Parallel Interference Cancellation) has been used for the signal detection. However, the bit error rate (BER) performance is degraded when channel parameters are estimated using cross correlation between the received signals and the known training sequence. To alleviate the degradation, this report proposes to employ highly accurate estimation scheme based on the quasi-Newton method for Doppler frequencies that affect the BER performance most. Computer simulations under Rician fading channel conditions demonstrate that PIC employing the highly accurate estimation of the Doppler frequencies can improve the BER performance furthermore.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Automatic identification system / Space-based AIS / cross correlation / PIC / Doppler frequency / quasi-Newton method
Paper # SAT2020-38
Date of Issue 2021-02-11 (SAT)

Conference Information
Committee SANE / SAT
Conference Date 2021/2/18(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Online
Topics (in Japanese) (See Japanese page)
Topics (in English) Satellite technology, etc.
Chair Akitsugu Nadai(NICT) / Hisashi Sujikai(NHK)
Vice Chair Hiroyoshi Yamada(Niigata Univ.) / Makoto Tanaka(Tokai Univ.) / Hiroyasu Ishikawa(Nihon Univ.) / Tetsushi Ikegami(Meiji Univ.)
Secretary Hiroyoshi Yamada(Univ. of Electro-Comm.) / Makoto Tanaka(Mitsubishi Electric) / Hiroyasu Ishikawa(NHK) / Tetsushi Ikegami(KDDI Research)
Assistant Shunichi Futatsumori(ENRI) / Takuya Okura(NICT) / Daisuke Goto(NTT)

Paper Information
Registration To Technical Committee on Space, Aeronautical and Navigational Electronics / Technical Committee on Satellite Telecommunications
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Signal Decomposition of Collided Packets Employing Highly Accurate Estimation of Doppler Frequencies in Space-based AIS
Sub Title (in English)
Keyword(1) Automatic identification system
Keyword(2) Space-based AIS
Keyword(3) cross correlation
Keyword(4) PIC
Keyword(5) Doppler frequency
Keyword(6) quasi-Newton method
1st Author's Name Kohei Nozaki
1st Author's Affiliation Tokyo Institute of Technology(Tokyo Tech)
2nd Author's Name Yuwa Takanezawa
2nd Author's Affiliation Tokyo Institute of Technology(Tokyo Tech)
3rd Author's Name Yuyuan Chang
3rd Author's Affiliation Tokyo Institute of Technology(Tokyo Tech)
4th Author's Name Kazuhiko Fukawa
4th Author's Affiliation Tokyo Institute of Technology(Tokyo Tech)
5th Author's Name Daichi Hirahara
5th Author's Affiliation Japan Aerospace Exploration Agency(JAXA)
Date 2021-02-19
Paper # SAT2020-38
Volume (vol) vol.120
Number (no) SAT-372
Page pp.pp.48-53(SAT),
#Pages 6
Date of Issue 2021-02-11 (SAT)