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| Presentation | 2007-08-24 10:30 Results of an Underwater Communication Experiment at Deep Sea Using QPSK and 8PSK Hiroshi Ochi, Yoshitaka Watanabe, Takuya Shimura (JAMSTEC)  US2007-28 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In JAMSTEC, short-range (up to 500 m) high speed (over 64 kbps) acoustic communication system for deep sea environment has been investigating. To obtaining an real sea data of acoustic transmission, an experiment was carried out at the depth of 1,000m. A transmitter was moored at near sea bottom. And a receiver was suspended from a surface ship by wire rope. The distance between the transmitter and the receiver was 250 - 550 m. As a transducer, wideband tilted toroidal beam with reflector was used. By this transducer, when the transmitter was moored at near the sea bottom, bottom reflected waves were well reduced. Carrier frequency of this projector is 80 kHz, and its bandwidth is 40 kHz. Two omni-directional hydrophones were used for receiving. Quadrature phase shift keying (QPSK) and 8PSK were used as its modulation method. The data of several transmission speed (10 k symbol per second (sps), 12.5 ksps, 16 ksps, 20 ksps, 25 ksps and 40 ksps) were obtained at the transmission range of 250-550 m. The two channel decision feedback equalizer (DFE) was applied for the demodulation algorithm. In this experiment, 80 kbps of transmission rate was achieved at range of 510 m with using QPSK, and 120 kbps of transmission rate was achieved at range of 300 m with using. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Acoustic Communication / QPSK / 8PSK / Wideband Transducer / Deep Water / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 107, no. 200, US2007-28, pp. 1-5, Aug. 2007. | |
| Paper # | US2007-28 | |
| Date of Issue | 2007-08-17 (US) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and 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) | |
| Download PDF | US2007-28 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2007-08-24 - 2007-08-24 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | The Port and Airport Research Institute |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Underwater Acoustics |
| Paper Information | |
| Registration To | US |
| Conference Code | 2007-08-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Results of an Underwater Communication Experiment at Deep Sea Using QPSK and 8PSK |
| Sub Title (in English) | |
| Keyword(1) | Acoustic Communication |
| Keyword(2) | QPSK |
| Keyword(3) | 8PSK |
| Keyword(4) | Wideband Transducer |
| Keyword(5) | Deep Water |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Hiroshi Ochi |
| 1st Author's Affiliation | Japan Agency for Marine-Earth Science and Technology (JAMSTEC) |
| 2nd Author's Name | Yoshitaka Watanabe |
| 2nd Author's Affiliation | Japan Agency for Marine-Earth Science and Technology (JAMSTEC) |
| 3rd Author's Name | Takuya Shimura |
| 3rd Author's Affiliation | Japan Agency for Marine-Earth Science and Technology (JAMSTEC) |
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| Speaker | Author-1 |
| Date Time | 2007-08-24 10:30:00 |
| Presentation Time | 30 minutes |
| Registration for | US |
| Paper # | US2007-28 |
| Volume (vol) | vol.107 |
| Number (no) | no.200 |
| Page | pp.1-5 |
| #Pages | 5 |
| Date of Issue | 2007-08-17 (US) |
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