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Paper Abstract and Keywords
Presentation 2026-03-05 17:15
Experimental Evaluation of Maximum Likelihood Receiver Using Measured Data of Underwater Acoustic Communication
Nozomu Akuzawa, Kazuhiko Fukawa (Tokyo Tech) RCS2025-283
Abstract (in Japanese) (See Japanese page) 
(in English) Underwater acoustic (UWA) communications suffer from significantly degraded transmission performance due to Doppler shifts and multipaths with long delay time. To compensate for this degradation, a multiple-input multiple-output (MIMO) maximum likelihood (ML) based receiver for orthogonal frequency division multiplexing (OFDM) has been proposed. By introducing a basis expansion model (BEM) into adaptive array antennas, the preprocessor of the ML-based receiver alleviates time variations of the time-varying channels. Furthermore, signal components of which delay time exceeds the guard interval (GI) can be also suppressed by adaptive array combining. The outputs of the array combiners are fed into an ML-based signal detector that exploits signal components with the delay time being not greater than GI and that is followed by a channel decoder to improve the reliability of detected information bits. However, performance of the ML-based receiver has been evaluated by only computer simulations, and its experimental evaluations in actual UWA communication environments have not been conducted yet. Therefore, this report aims to demonstrate that the MIMO-OFDM ML receiver can operate well even in the actual environments by using experimental data of UWA communications.
Since the transmission parameters of the OFDM signal used in a subsea experiment were fixed and unchangeable, channel parameters including delay time, Doppler frequency, initial phase, and amplitude of the propagation paths are firstly estimated by using pilot signals. On the basis of these estimates, computer simulations are conducted to verify the operation of the ML receiver and to optimize the OFDM transmission parameters.
Keyword (in Japanese) (See Japanese page) 
(in English) UWA Communications / MIMO-OFDM / maximum likelihood receiver / basis expansion model (BEM) / actual sea channel / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 387, RCS2025-283, pp. 140-145, March 2026.
Paper # RCS2025-283 
Date of Issue 2026-02-25 (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 RCS2025-283

Conference Information
Committee RCS SR SRW  
Conference Date 2026-03-04 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo University of Science 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2026-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experimental Evaluation of Maximum Likelihood Receiver Using Measured Data of Underwater Acoustic Communication 
Sub Title (in English)  
Keyword(1) UWA Communications  
Keyword(2) MIMO-OFDM  
Keyword(3) maximum likelihood receiver  
Keyword(4) basis expansion model (BEM)  
Keyword(5) actual sea channel  
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Keyword(7)  
Keyword(8)  
1st Author's Name Nozomu Akuzawa  
1st Author's Affiliation Institute of Science Tokyo (Tokyo Tech)
2nd Author's Name Kazuhiko Fukawa  
2nd Author's Affiliation Institute of Science Tokyo (Tokyo Tech)
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Speaker Author-1 
Date Time 2026-03-05 17:15:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2025-283 
Volume (vol) vol.125 
Number (no) no.387 
Page pp.140-145 
#Pages 6 
Date of Issue 2026-02-25 (RCS) 

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