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Paper Abstract and Keywords
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
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

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  
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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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