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Paper Abstract and Keywords
Presentation 2021-06-24 13:30
Comparison of Differential OFDM Systems Employing Multiple Differential Detection with Channel Prediction in Doubly Selective Channels
Taichi Fujita, Kota Iwamoto, Hiroshi Kubo (Ritsumeikan Univ.) RCS2021-56
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we compare the performance of differential orthogonal frequency division multiplexing (OFDM) for underwater acoustic communications (UWAC), which is a doubly selective channel with severe time and frequency selectivity.
UWAC can be modelled as a sparse static channel with a large Doppler shift.Double differential OFDM has good performance when the Doppler shifts of each path in this channel are almost the same.However, when the Doppler shift of each path is different, the performance is degraded.
In this paper, we evaluate the performance of differential OFDM employing multiple differential detection with channel prediction when the Doppler shift of each path is different.The modulation schemes used are DQPSK, DBPSK, DTC8PSK, and DTCQPSK.Finally, computer simulations show that differential OFDM under consideration has good characteristics when there is a difference in the Doppler shift of each path.
Keyword (in Japanese) (See Japanese page) 
(in English) Orthogonal Frequency Division Multiplexing / Channel Prediction / Multiple Differential Detection / Trellis-Coded Modulation / Underwater Acoustic Communications / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 72, RCS2021-56, pp. 163-168, June 2021.
Paper # RCS2021-56 
Date of Issue 2021-06-16 (RCS) 
ISSN 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 RCS2021-56

Conference Information
Committee RCS  
Conference Date 2021-06-23 - 2021-06-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2021-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparison of Differential OFDM Systems Employing Multiple Differential Detection with Channel Prediction in Doubly Selective Channels 
Sub Title (in English)  
Keyword(1) Orthogonal Frequency Division Multiplexing  
Keyword(2) Channel Prediction  
Keyword(3) Multiple Differential Detection  
Keyword(4) Trellis-Coded Modulation  
Keyword(5) Underwater Acoustic Communications  
1st Author's Name Taichi Fujita  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Kota Iwamoto  
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 2021-06-24 13:30:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2021-56 
Volume (vol) vol.121 
Number (no) no.72 
Page pp.163-168 
Date of Issue 2021-06-16 (RCS) 

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