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Paper Abstract and Keywords
Presentation 2026-01-27 11:45
Computationally Efficient Deep-Unfolded Multi-Tap Time-Domain Precoding
Soma Kato (Yokohama National Univ.), Hiroki Iimori, Yuto Hama, Chandan Pradhan, Szabolcs Malomsoky (ERJ), Naoki Ishikawa (Yokohama National Univ.) IT2025-69 SIP2025-83 RCS2025-240
Abstract (in Japanese) (See Japanese page) 
(in English) Time-domain precoding has emerged as a promising technique due to its low complexity. In this paper, we tackle the critical computational bottleneck arising from the multi-tap design of space-time block diagonal channel shortening (ST-BDCS), a time-domain precoding scheme realizing the concept of channel estimation considerate precoding. While this multi-tap approach enhances spectral efficiency (SE) by allowing multiple channel taps, it necessitates an iterative optimization involving SE and gradient calculations for every subcarrier, resulting in prohibitive complexity. In our simulations, we demonstrate that by applying deep unfolding to this computationally intensive optimization process of ST-BDCS, the need for SE calculations for every subcarrier is eliminated, thereby reducing complexity while accelerating convergence. Furthermore, by introducing a sampling process to the gradient calculations, the complexity was significantly reduced while maintaining nearly the same convergence speed as the conventional method.
Keyword (in Japanese) (See Japanese page) 
(in English) Deep Unfolding / Time-domain Precoding / MIMO-OFDM / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 333, SIP2025-83, pp. 184-189, Jan. 2026.
Paper # SIP2025-83 
Date of Issue 2026-01-19 (IT, SIP, 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 IT2025-69 SIP2025-83 RCS2025-240

Conference Information
Committee IT RCS SIP  
Conference Date 2026-01-26 - 2026-01-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Forest Sendai 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing for Wireless Communications, Learning, Mathematics, Information Theory, etc. 
Paper Information
Registration To SIP 
Conference Code 2026-01-IT-RCS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Computationally Efficient Deep-Unfolded Multi-Tap Time-Domain Precoding 
Sub Title (in English)  
Keyword(1) Deep Unfolding  
Keyword(2) Time-domain Precoding  
Keyword(3) MIMO-OFDM  
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1st Author's Name Soma Kato  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Hiroki Iimori  
2nd Author's Affiliation Ericsson Research Japan (ERJ)
3rd Author's Name Yuto Hama  
3rd Author's Affiliation Ericsson Research Japan (ERJ)
4th Author's Name Chandan Pradhan  
4th Author's Affiliation Ericsson Research Japan (ERJ)
5th Author's Name Szabolcs Malomsoky  
5th Author's Affiliation Ericsson Research Japan (ERJ)
6th Author's Name Naoki Ishikawa  
6th Author's Affiliation Yokohama National University (Yokohama National Univ.)
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Speaker Author-1 
Date Time 2026-01-27 11:45:00 
Presentation Time 25 minutes 
Registration for SIP 
Paper # IT2025-69, SIP2025-83, RCS2025-240 
Volume (vol) vol.125 
Number (no) no.332(IT), no.333(SIP), no.334(RCS) 
Page pp.184-189 
#Pages 6 
Date of Issue 2026-01-19 (IT, SIP, RCS) 

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