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Paper Abstract and Keywords
Presentation 2026-06-17 15:30
A Study on Delay-Domain Denoising in Message Space for Joint Channel and CFO Estimation in MU-MIMO-OFDM Uplink
Takuto Ikebayashi, Shoma Hara, Takumi Takahashi (Osaka Univ.), Kenta Ito (KDDI), Koji Ishibashi (UEC), Hedeki Ochiai (Osaka Univ.) RCS2026-44
Abstract (in Japanese) (See Japanese page) 
(in English) This paper addresses joint channel and carrier frequency offset (CFO) estimation for uplink multi-user multi-input multi-output orthogonal frequency-division multiplexing (MU-MIMO-OFDM) systems and proposes a delay-domain denoising framework in message space. The method exploits delay-domain channel structure while remaining compatible with existing frequency-domain OFDM/JCCE receivers. Instead of reformulating the entire receiver in the time domain, it transforms only the Gaussian messages associated with pilot-subcarrier channel estimates, generated by the moment-matching step of matched filter expectation propagation (MF-EP), into an effective delay domain and feeds the denoised messages back to frequency-domain JCCE. In the denoising stage, taps outside the cyclic prefix (CP) are removed by deterministic support projection, whereas taps inside the CP are processed by sparse Bernoulli-Gaussian modeling with expectation-maximization (EM)-based parameter updates. Thus, delay-domain channel structure can be incorporated with limited additional processing beyond conventional frequency-domain Gaussian denoising. Simulation results show clear estimation gains over conventional frequency-domain JCCE and bit-error-rate performance close to the ideal case with perfect channel and CFO knowledge.
Keyword (in Japanese) (See Japanese page) 
(in English) MU-MIMO-OFDM / carrier frequency offset / delay-domain denosing / sparse estimation / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-44, pp. 110-115, June 2026.
Paper # RCS2026-44 
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 RCS2026-44

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) A Study on Delay-Domain Denoising in Message Space for Joint Channel and CFO Estimation in MU-MIMO-OFDM Uplink 
Sub Title (in English)  
Keyword(1) MU-MIMO-OFDM  
Keyword(2) carrier frequency offset  
Keyword(3) delay-domain denosing  
Keyword(4) sparse estimation  
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1st Author's Name Takuto Ikebayashi  
1st Author's Affiliation The University of Osaka (Osaka Univ.)
2nd Author's Name Shoma Hara  
2nd Author's Affiliation The University of Osaka (Osaka Univ.)
3rd Author's Name Takumi Takahashi  
3rd Author's Affiliation The University of Osaka (Osaka Univ.)
4th Author's Name Kenta Ito  
4th Author's Affiliation KDDI Research Inc. (KDDI)
5th Author's Name Koji Ishibashi  
5th Author's Affiliation The University of Electro-Communications (UEC)
6th Author's Name Hedeki Ochiai  
6th Author's Affiliation The University of Osaka (Osaka Univ.)
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Speaker Author-1 
Date Time 2026-06-17 15:30:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-44 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.110-115 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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