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Paper Abstract and Keywords
Presentation 2026-01-27 11:20
Fast Weight Derivation for Phase-Controlled Massive MIMO Null-Space Expansion with Analog Beamforming
Masaya Ueda, Yuta Tsunoda, Kazuki Maruta (Tokyo Univ. of Science), Chun-hsiang Huang, Koji Ikuta (Kyocera) IT2025-64 SIP2025-78 RCS2025-235
Abstract (in Japanese) (See Japanese page) 
(in English) In multi-user MIMO downlink transmission, null-space expansion (NSE) that leverages the vast antenna degrees of freedom in Massive MIMO has been proposed as an effective approach to mitigate the degradation of spatial multiplexing performance caused by channel variations due to user mobility. From the perspective of implementation feasibility, we have previously proposed and verified the effectiveness of an NSE scheme that applies phase-only adaptive nulling (POAN), which performs null-steering using only phase adjustments under the assumption of an analog beamformer. However, since the weight derivation relies on gradient-based optimization, the associated iterative processing leads to increased computational load and processing latency. In this study, we report the results of our study on accelerating weight derivation through initial weight setting and threshold-based processing.
Keyword (in Japanese) (See Japanese page) 
(in English) Massive MIMO / Multiuser MIMO / Null-space expansion / Analog beamforming / Phase control / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 334, RCS2025-235, pp. 154-159, Jan. 2026.
Paper # RCS2025-235 
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 IT2025-64 SIP2025-78 RCS2025-235

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 RCS 
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) Fast Weight Derivation for Phase-Controlled Massive MIMO Null-Space Expansion with Analog Beamforming 
Sub Title (in English)  
Keyword(1) Massive MIMO  
Keyword(2) Multiuser MIMO  
Keyword(3) Null-space expansion  
Keyword(4) Analog beamforming  
Keyword(5) Phase control  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Masaya Ueda  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Yuta Tsunoda  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
3rd Author's Name Kazuki Maruta  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
4th Author's Name Chun-hsiang Huang  
4th Author's Affiliation Kyocera Corporation (Kyocera)
5th Author's Name Koji Ikuta  
5th Author's Affiliation Kyocera Corporation (Kyocera)
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Speaker Author-1 
Date Time 2026-01-27 11:20:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # IT2025-64, SIP2025-78, RCS2025-235 
Volume (vol) vol.125 
Number (no) no.332(IT), no.333(SIP), no.334(RCS) 
Page pp.154-159 
#Pages 6 
Date of Issue 2026-01-19 (IT, SIP, RCS) 

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