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Paper Abstract and Keywords
Presentation 2019-11-22 15:05
[Invited Lecture] Study on Underwater Acoustic Communication using Time-Reversal DFE -- Application for MIMO and Multiuser Communication --
Takuya Shimura, Mitsuyasu Deguchi, Yukihiro Kida, Yoshitakawa Watanabe (JAMSTEC) AP2019-139 RCS2019-234
Abstract (in Japanese) (See Japanese page) 
(in English) In underwater acoustic communication, effects of multipath interferences and Doppler shift are much larger than those in radio communication in air, and available bandwidth is much narrower. To overcome these problems, time-reversal decision feedback equalizer (DFE) is effective especially in horizontal communication because multipath signals are collected and utilized. Additionally, adaptive time reversal was proposed to suppress co-channel or multiuser interference as well as multipath interference by using the focusing effect. In this study, adaptive passive time-reversal DFE is applied to multiple-input/multiple-output (MIMO) communication and multiuser communication, and its effectiveness is investigated in simulation, tank experiment, and at-sea experiment. As results, in tank experiment of MIMO communication, in case of using orthogonal frequency division multiplexing (OFDM), it is impossible to increase the number of MIMO transmitter channels. In the meantime, in case of using adaptive passive time-reversal DFE, the spectral efficiency is not degraded as increasing the number of channel and it is possible to achieve 5×12 MIMO communication at the efficiency of 16.7bps/Hz. In at-sea experiment for multiuser communication, it was demonstrated that adaptive passive time-reversal DFE can realize multiuser communication with a transmitter moving at the velocity of 2 knots.
Keyword (in Japanese) (See Japanese page) 
(in English) underwater acoustic communication / time reversal / phase conjugate / adaptive time reversal / decision feedback equalizer (DFE) / multiple-input/multiple-output (MIMO) / orthogonal frequency division multiplexing (OFDM) / spatial division multiplexing (SDM)  
Reference Info. IEICE Tech. Rep., vol. 119, no. 296, RCS2019-234, pp. 175-180, Nov. 2019.
Paper # RCS2019-234 
Date of Issue 2019-11-13 (AP, RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 AP2019-139 RCS2019-234

Conference Information
Committee AP RCS  
Conference Date 2019-11-20 - 2019-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Saga Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceler, MIMO, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2019-11-AP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on Underwater Acoustic Communication using Time-Reversal DFE 
Sub Title (in English) Application for MIMO and Multiuser Communication 
Keyword(1) underwater acoustic communication  
Keyword(2) time reversal  
Keyword(3) phase conjugate  
Keyword(4) adaptive time reversal  
Keyword(5) decision feedback equalizer (DFE)  
Keyword(6) multiple-input/multiple-output (MIMO)  
Keyword(7) orthogonal frequency division multiplexing (OFDM)  
Keyword(8) spatial division multiplexing (SDM)  
1st Author's Name Takuya Shimura  
1st Author's Affiliation Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
2nd Author's Name Mitsuyasu Deguchi  
2nd Author's Affiliation Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
3rd Author's Name Yukihiro Kida  
3rd Author's Affiliation Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
4th Author's Name Yoshitakawa Watanabe  
4th Author's Affiliation Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
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Date Time 2019-11-22 15:05:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-AP2019-139,IEICE-RCS2019-234 
Volume (vol) IEICE-119 
Number (no) no.295(AP), no.296(RCS) 
Page pp.181-186(AP), pp.175-180(RCS) 
#Pages IEICE-6 
Date of Issue IEICE-AP-2019-11-13,IEICE-RCS-2019-11-13 

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