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Paper Abstract and Keywords
Presentation 2020-01-24 12:35
Differential Orthogonal Frequency-Division Multiplexing Employing AFC for Time-Varying Doppler Shifts in Underwater Acoustic Communications
Yui Nakai, Yuka Tanaka, Hiroshi Kubo (Ritsumeikan Univ.) IT2019-70 SIP2019-83 RCS2019-300
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes differential orthogonal frequency division multiplexing (OFDM) employing automatic frequency control (AFC) for time-varying Doppler shifts in underwater acoustic communications (UWACs). There exist the following two issues in UWACs: 1) to improve time and frequency selective channels, i.e., doubly-selective channels; 2) to track fast time-varying Doppler shifts. With respect to the problem 1), the proposed scheme employs differential encoding and differential detection for time selectivity, and it also employs OFDM for frequency selectivity. With respect to the problem 2), the proposed scheme employs a multiple open-loop frequency estimation (MOLFE), which has good trade-off between frequency coverage and estimation accuracy in short observation time. Next, this paper proposes a simple time-varying Doppler shifts model of a turning AUV for simulation similar to real environment. Finally, computer simulation confirms that the proposed differential OFDM employing MOLFE has excellent performance in doubly-selective channels with time-varying Doppler shifts like turning AUV.
Keyword (in Japanese) (See Japanese page) 
(in English) Underwater Acoustic Communications / Differential Orthogonal Frequency Division Multiplexing / Automatic Frequency Control / Tone Signal / Doubly-Selective Channels / Time-Varying Doppler Shifts / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 378, RCS2019-300, pp. 197-202, Jan. 2020.
Paper # RCS2019-300 
Date of Issue 2020-01-16 (IT, SIP, 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 IT2019-70 SIP2019-83 RCS2019-300

Conference Information
Committee IT SIP RCS  
Conference Date 2020-01-23 - 2020-01-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima City Youth Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2020-01-IT-SIP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Differential Orthogonal Frequency-Division Multiplexing Employing AFC for Time-Varying Doppler Shifts in Underwater Acoustic Communications 
Sub Title (in English)  
Keyword(1) Underwater Acoustic Communications  
Keyword(2) Differential Orthogonal Frequency Division Multiplexing  
Keyword(3) Automatic Frequency Control  
Keyword(4) Tone Signal  
Keyword(5) Doubly-Selective Channels  
Keyword(6) Time-Varying Doppler Shifts  
1st Author's Name Yui Nakai  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Yuka Tanaka  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Hiroshi Kubo  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2020-01-24 12:35:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # IT2019-70, SIP2019-83, RCS2019-300 
Volume (vol) vol.119 
Number (no) no.376(IT), no.377(SIP), no.378(RCS) 
Page pp.197-202 
Date of Issue 2020-01-16 (IT, SIP, RCS) 

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