Information: Join today and make your research activities more affordable! Technical workshop participation fees and annual registration fees are available at member rates.
Notice: [Important] Announcement of Changes to Registration Fee Payment and Manuscript Upload Procedures for IEICE Technical Meetings
IEICE Technical Committee Submission System
Conference Paper's Information		 Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
Presentation 2026-03-06 14:10
Study on Maximum Likelihood Estimation of Varing Fading Channels at Base Station with Null Space Expansion in Multi-User MIMO
Masaharu Abiru, Makoto Taromaru (Fukuoka Univ.), Hidekazu Murata (Yamaguchi Univ.), Tatsuhiko Iwakuni, Daisei Uchida, Shuki Wai, Takafumi Fujita (NTT, Inc) RCS2025-294
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 the channel 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, conditional probability density function of the deviated channel from the one at the newest RS is studied theoretically, where each element of the channel matrics is i.i.d. (independently and identically distributed) and the channels at the newest RS and the past RSs are known. Using this analysis, the maximum likelyhood (ML) estimate of the deviated channel is shown.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO / Null-space expansion / Rayleigh fading / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 387, RCS2025-294, pp. 204-208, March 2026.
Paper # RCS2025-294 
Date of Issue 2026-02-25 (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 RCS2025-294

Conference Information
Committee RCS SR SRW  
Conference Date 2026-03-04 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo University of Science 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2026-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on Maximum Likelihood Estimation of Varing Fading Channels at Base Station with Null Space Expansion in Multi-User MIMO 
Sub Title (in English)  
Keyword(1) MIMO  
Keyword(2) Null-space expansion  
Keyword(3) Rayleigh fading  
Keyword(4)  
Keyword(5)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Masaharu Abiru  
1st Author's Affiliation Graduate School of Fukuoka University (Fukuoka Univ.)
2nd Author's Name Makoto Taromaru  
2nd Author's Affiliation Graduate School of 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 Access Network Service Systems Laboratories (NTT, Inc)
5th Author's Name Daisei Uchida  
5th Author's Affiliation Access Network Service Systems Laboratories (NTT, Inc)
6th Author's Name Shuki Wai  
6th Author's Affiliation Access Network Service Systems Laboratories (NTT, Inc)
7th Author's Name Takafumi Fujita  
7th Author's Affiliation Access Network Service Systems Laboratories (NTT, Inc)
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
21st Author's Name  
21st Author's Affiliation ()
22nd Author's Name  
22nd Author's Affiliation ()
23rd Author's Name  
23rd Author's Affiliation ()
24th Author's Name  
24th Author's Affiliation ()
25th Author's Name  
25th Author's Affiliation ()
26th Author's Name / /
26th Author's Affiliation ()
()
27th Author's Name / /
27th Author's Affiliation ()
()
28th Author's Name / /
28th Author's Affiliation ()
()
29th Author's Name / /
29th Author's Affiliation ()
()
30th Author's Name / /
30th Author's Affiliation ()
()
31st Author's Name / /
31st Author's Affiliation ()
()
32nd Author's Name / /
32nd Author's Affiliation ()
()
33rd Author's Name / /
33rd Author's Affiliation ()
()
34th Author's Name / /
34th Author's Affiliation ()
()
35th Author's Name / /
35th Author's Affiliation ()
()
36th Author's Name / /
36th Author's Affiliation ()
()
Speaker Author-1 
Date Time 2026-03-06 14:10:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2025-294 
Volume (vol) vol.125 
Number (no) no.387 
Page pp.204-208 
#Pages 5 
Date of Issue 2026-02-25 (RCS) 

[Return to Top Page]

[Return to IEICE Web Page]
The Institute of Electronics, Information and Communication Engineers (IEICE), Japan