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Paper Abstract and Keywords
Presentation 2026-06-18 09:55
Successive Path Estimation-Based Low-Complexity OTFS Channel Estimation in Fractional Doppler Channels
Hisashi Kano (Tokyo Univ. of Science), Takanori Hara (Tohoku Univ.), Kenichi Higuchi (Tokyo Univ. of Science) RCS2026-50
Abstract (in Japanese) (See Japanese page) 
(in English) Orthogonal time frequency space (OTFS) modulation has attracted attention as an effective modulation scheme against doubly-selective fading arising in high-mobility communications. In channel estimation (CE) for OTFS, the fractional Doppler spreads the energy of each path over the delay-Doppler (DD) domain, making accurate estimation challenging. As high-accuracy CE methods, sparse Bayesian learning (SBL)-based and coordinate descent (CD)-based methods that exploit channel sparsity in the DD domain have been proposed; however, they suffer from high computational complexity due to iterative matrix inversion. To address this issue, this paper proposes a low-complexity CE method that divides the received signal on a per-delay-tap basis and successively estimates the fractional Doppler of each path via a bisection search without iterative matrix inversion.
Computer simulations demonstrate that the proposed method significantly reduces the computational complexity while achieving channel estimation accuracy and bit error rate performance comparable to or better than those of the conventional methods.
Keyword (in Japanese) (See Japanese page) 
(in English) OTFS / channel estimation / successive path estimation / fractional Doppler / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-50, pp. 141-146, June 2026.
Paper # RCS2026-50 
Date of Issue 2026-06-10 (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 RCS2026-50

Conference Information
Committee RCS  
Conference Date 2026-06-17 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English) The Ohama Nobumoto Memorial Hall 
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 2026-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Successive Path Estimation-Based Low-Complexity OTFS Channel Estimation in Fractional Doppler Channels 
Sub Title (in English)  
Keyword(1) OTFS  
Keyword(2) channel estimation  
Keyword(3) successive path estimation  
Keyword(4) fractional Doppler  
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1st Author's Name Hisashi Kano  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Takanori Hara  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Kenichi Higuchi  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2026-06-18 09:55:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-50 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.141-146 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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