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Paper Abstract and Keywords
Presentation 2026-06-17 15:20
A Study on Polar-Domain Transform Matrix Design for Low-Complexity Channel Estimation in Near-Field XL-MIMO
Taichi Okabe, Takumi Takahashi, Hideki Ochiai (The Univ of Osaka) RCS2026-43
Abstract (in Japanese) (See Japanese page) 
(in English) In extremely-large multiple-input multiple-output (XL-MIMO) systems operating at millimeter-wave frequencies, the enlarged antenna aperture extends the Rayleigh distance, making near-field effects significant in channel estimation. Since near-field channels depend on both angle and distance, DFT-based angular-domain representations suffer from energy leakage and lose sparsity. In this paper, we propose a polar-domain transform matrix design based on the maximum range interval that
preserves the unimodality of the transformed angular response. The proposed design sequentially determines range samples while keeping the transform matrix compact. We further develop a low-complexity estimator that partitions the transform matrix into range blocks and applies compressed sensing only to the dominant block. Simulation results show a favorable trade-off between estimation accuracy and computational complexity, achieving near polar-domain performance with a search dimension comparable to that of the DFT basis.
Keyword (in Japanese) (See Japanese page) 
(in English) XL-MIMO / near field / channel estimation / polar-domain representation / transform matrix design / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-43, pp. 104-109, June 2026.
Paper # RCS2026-43 
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 RCS2026-43

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 Polar-Domain Transform Matrix Design for Low-Complexity Channel Estimation in Near-Field XL-MIMO 
Sub Title (in English)  
Keyword(1) XL-MIMO  
Keyword(2) near field  
Keyword(3) channel estimation  
Keyword(4) polar-domain representation  
Keyword(5) transform matrix design  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Taichi Okabe  
1st Author's Affiliation The University of Osaka (The Univ of Osaka)
2nd Author's Name Takumi Takahashi  
2nd Author's Affiliation The University of Osaka (The Univ of Osaka)
3rd Author's Name Hideki Ochiai  
3rd Author's Affiliation The University of Osaka (The Univ of Osaka)
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Speaker Author-1 
Date Time 2026-06-17 15:20:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-43 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.104-109 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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