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Paper Abstract and Keywords
Presentation 2026-01-27 14:45
Study on Path Loss Environments for Multi-User MIMO with Null Space Expansion Using Subarrays Distributed at Base Stations
Masaharu Abiru, Makoto Taromaru (Fukuoka Univ.), Hidekazu Murata (Yamaguchi Univ.), Tatsuhiko Iwakuni, Daisei Uchida, Shuki Wai, Takafumi Fujita (NTT) SR2025-78
Abstract (in Japanese) (See Japanese page) 
(in English) When a mobile terminal connected with MIMO moves in high speed, the channel capacity is degraded because thechannel matirix deviates from the channels got at the newest reference symbol (RS) and inter-stream or inter-user interference increases in multiuser MIMO. To overcome this problem, Iwakuni, et al. proposed null-space extention method, which forms null space not only for the interference channel at the newest reference symbol but also for the previous interference channels. In this report, in order to conduct more realistic simulations, we report results obtained by taking into account distance-dependent path loss and shadowing from distributed base-station antennas to terminals.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO / Null-space expansion / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 336, SR2025-78, pp. 75-79, Jan. 2026.
Paper # SR2025-78 
Date of Issue 2026-01-19 (SR) 
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)
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Conference Information
Committee SR  
Conference Date 2026-01-26 - 2026-01-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamagata Terrsa 
Topics (in Japanese) (See Japanese page) 
Topics (in English) AI/machine learning, IoT, Distributed networking, general topics 
Paper Information
Registration To SR 
Conference Code 2026-01-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on Path Loss Environments for Multi-User MIMO with Null Space Expansion Using Subarrays Distributed at Base Stations 
Sub Title (in English)  
Keyword(1) MIMO  
Keyword(2) Null-space expansion  
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1st Author's Name Masaharu Abiru  
1st Author's Affiliation Fukuoka University (Fukuoka Univ.)
2nd Author's Name Makoto Taromaru  
2nd Author's Affiliation Fukuoka University (Fukuoka Univ.)
3rd Author's Name Hidekazu Murata  
3rd Author's Affiliation Yamaguchi University (Yamaguchi Univ.)
4th Author's Name Tatsuhiko Iwakuni  
4th Author's Affiliation NTT, Inc. (NTT)
5th Author's Name Daisei Uchida  
5th Author's Affiliation NTT, Inc. (NTT)
6th Author's Name Shuki Wai  
6th Author's Affiliation NTT, Inc. (NTT)
7th Author's Name Takafumi Fujita  
7th Author's Affiliation NTT, Inc. (NTT)
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Speaker Author-1 
Date Time 2026-01-27 14:45:00 
Presentation Time 25 minutes 
Registration for SR 
Paper # SR2025-78 
Volume (vol) vol.125 
Number (no) no.336 
Page pp.75-79 
#Pages 5 
Date of Issue 2026-01-19 (SR) 

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