| Presentation | 2017-03-01 Separate Detection of Collided Packets in the Space-based AIS Takanori Kanzawa, Kazuhiko Fukawa, Daichi Hirahara, Yuyuan Chang, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Information of Automatic Identification System (AIS) can be obtained across the open sea by satellites. In Japan, JAXA has conducted a SPace-based AIS Experiment (SPAISE). In this experiment, satellites equipped with AIS receivers have been launched to an altitude of 600 km and have observed AIS signals suffering from Doppler shift. The experiment results clarify that the wide coverage of the satellite causes collision of many AIS signal packets, which makes signal detection very hard. To detect the collided packets separately, this report proposes a separate detection method exploiting Doppler frequencies and delayed time that are different among collided packets. First, the phase of the training sequence is rotated by candidates of the Doppler frequency and then its received timing is delayed by candidates of delayed time. Then, the correlation between the resultant training sequences and the received signals is calculated. By searching for the highest peak of the correlation, we can determine the Doppler frequency and delayed time of the dominant AIS packet. The training sequence with the estimated Doppler frequency and delayed time is subtracted from the received signals. The correlation between the resultant received signals and training sequences is recalculated. These processes are repeated until the peak of the correlation does not exceed a threshold, which we can estimate the parameters of collided packets. Using estimates of these parameters and complex envelope, successive interference cancellation (SIC) iteratively detects AIS signals and subtracts the replica signals from the received signals. Computer simulations under the condition of two collided packets evaluate mean squared estimation errors of these parameters and complex envelope. It is also shown that the average bit error rate of $10^{-3}$ can be achieved with a difference of average received powers being 10 dB. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Automatic Identification System (AIS) / SPAISE / packet collision number / correlation detection / SIC |
| Paper # | RCS2016-302 |
| Date of Issue | 2017-02-22 (RCS) |
| Conference Information | |
| Committee | RCS / SR / SRW |
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| Conference Date | 2017/3/1(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Institute of Technology |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Mobile Communication Workshop |
| Chair | Hidekazu Murata(Kyoto Univ.) / Takeo Fujii(Univ. of Electro-Comm.) / Hiroshi Harada(Kyoto Univ.) |
| Vice Chair | Satoshi Denno(Okayama Univ.) / Yukitoshi Sanada(Keio Univ.) / Eisuke Fukuda(Fujitsu Labs.) / Kenta Umebayashi(Tokyo Univ. of Agric. and Tech.) / Masayuki Ariyoshi(NEC) / Suguru Kameda(Tohoku Univ.) / Masafumi Kato(Fujitsu) / Satoshi Denno(Okayama Univ.) |
| Secretary | Satoshi Denno(Toshiba) / Yukitoshi Sanada(NTT DoCoMo) / Eisuke Fukuda(Shinshu Univ.) / Kenta Umebayashi(NICT) / Masayuki Ariyoshi(Tottori Univ.) / Suguru Kameda(NICT) / Masafumi Kato / Satoshi Denno |
| Assistant | Tetsuya Yamamoto(Panasonic) / Toshihiko Nishimura(Hokkaido Univ.) / Koichi Ishihara(NTT) / Kazushi Muraoka(NEC) / Shinsuke Ibi(Osaka Univ.) / Kazuto Yano(ATR) / Mamiko Inamori(Tokai Univ.) / Hiroyuki Shiba(NTT) / Gia Khanh Tran(Tokyo Inst. of Tech.) / Wen Yun(Fujitsu) / Keiichi Mizutani(Kyoto Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems / Technical Committee on Smart Radio / Technical Committee on Short Range Wireless Communications |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Separate Detection of Collided Packets in the Space-based AIS |
| Sub Title (in English) | |
| Keyword(1) | Automatic Identification System (AIS) |
| Keyword(2) | SPAISE |
| Keyword(3) | packet collision number |
| Keyword(4) | correlation detection |
| Keyword(5) | SIC |
| 1st Author's Name | Takanori Kanzawa |
| 1st Author's Affiliation | Tokyo Institute of Technology(TokyoTech) |
| 2nd Author's Name | Kazuhiko Fukawa |
| 2nd Author's Affiliation | Tokyo Institute of Technology(TokyoTech) |
| 3rd Author's Name | Daichi Hirahara |
| 3rd Author's Affiliation | Japan Aerospace Exploration Agency(JAXA) |
| 4th Author's Name | Yuyuan Chang |
| 4th Author's Affiliation | Tokyo Institute of Technology(TokyoTech) |
| Date | 2017-03-01 |
| Paper # | RCS2016-302 |
| Volume (vol) | vol.116 |
| Number (no) | RCS-479 |
| Page | pp.pp.79-84(RCS), |
| #Pages | 6 |
| Date of Issue | 2017-02-22 (RCS) |