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Paper Abstract and Keywords
Presentation 2020-11-27 09:25
Differential OFDM Employing Joint Detection for Underwater Acoustic Communications
Hiroshi Kubo, Yuka Tanaka, Yui Nakai, Tetsuro Kubo, Haruka Toyota, Yoshitaka Yamamoto, Kouki Toyoda (Ritsumeikan Univ.) AP2020-89 RCS2020-131
Abstract (in Japanese) (See Japanese page) 
(in English) his paper discusses differential orthogonal frequency division multiplexing (OFDM) employing joint detection (JD) for underwater acoustic communications (UWACs) in the presence of severe double selectivity, where JD can estimate channel and data simultaneously. JD is effective for severe doubly-selective environment, because JD can detect data without pilot-symbols for its channel estimation. However, even differential OFDM needs frequent synchronization word (SW) insertion, in order to track fast time-varying SW timing. If differential OFDM performs differential encoding only for time direction and data detection by means of JD, there is no constraint for its phase differences between subcarriers. Thus, this differential OFDM can employ a subcarrier phase offset (SPO) scheme, whose subcarrier reference phase is equal to Zadoff-Chu (ZC) sequence of SW. SPO differential OFDM can improve transmission information efficiency, because JD can operate continuously through multiple frames. Finally, computer simulation confirms performance of SPO differential OFDM in UWAC environment.
Keyword (in Japanese) (See Japanese page) 
(in English) Multi-Carrier Modulation Scheme / Differential OFDM / Joint Detection / Doubly-Selective Channels / Underwater Acoustic Communications / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 249, RCS2020-131, pp. 116-121, Nov. 2020.
Paper # RCS2020-131 
Date of Issue 2020-11-18 (AP, RCS) 
ISSN 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 AP2020-89 RCS2020-131

Conference Information
Committee RCS AP UWT  
Conference Date 2020-11-25 - 2020-11-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
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 2020-11-RCS-AP-UWT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Differential OFDM Employing Joint Detection for Underwater Acoustic Communications 
Sub Title (in English)  
Keyword(1) Multi-Carrier Modulation Scheme  
Keyword(2) Differential OFDM  
Keyword(3) Joint Detection  
Keyword(4) Doubly-Selective Channels  
Keyword(5) Underwater Acoustic Communications  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hiroshi Kubo  
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 Yui Nakai  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
4th Author's Name Tetsuro Kubo  
4th Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
5th Author's Name Haruka Toyota  
5th Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
6th Author's Name Yoshitaka Yamamoto  
6th Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
7th Author's Name Kouki Toyoda  
7th Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2020-11-27 09:25:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # AP2020-89, RCS2020-131 
Volume (vol) vol.120 
Number (no) no.248(AP), no.249(RCS) 
Page pp.84-89(AP), pp.116-121(RCS) 
#Pages 6 
Date of Issue 2020-11-18 (AP, RCS) 

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