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Paper Abstract and Keywords
Presentation 2025-11-14 12:00
A Study of a Coordinated MU-MIMO Canceller by Using SRS
Ryohei Maeda, Takafumi Fujii (SoftBank), Teruya Fujii (Science Tokyo) RCS2025-178
Abstract (in Japanese) (See Japanese page) 
(in English) In mobile communication systems such as 5G, ultra-high-speed data transmission anywhere within a cell is expected. In cellular systems, which the same frequency is repeatedly reused in all cells, communication quality deteriorates due to adjacent cell interference, especially neighboring cell boundaries. The authors have proposed an interference cancellation technique neighboring cell boundaries that simultaneously uses a virtual cell MU-MIMO canceler and adaptive beamforming to cancel inter-cell interference by forming a virtual cell in which neighboring base stations cooperate with each other. In 4G and 5G systems, Sounding Reference Signals (SRS) are defined to estimate the propagation channel response of terminals in neighboring cells. However, since SRS is typically transmitted at intervals of several tens of milliseconds, there are concerns that the accuracy of channel estimation using SRS may degrade for high-mobility users, potentially impacting interference . In practice, however, most users are indoors and therefore have low mobility, meaning that channel estimation using SRS is generally sufficient. In this paper, we evaluate the effectiveness of a proposed coordinated MU-MIMO canceller for both uplink and downlink transmissions, taking into account the actual mobility of users.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile Communication / MU-MIMO / TDD / SRS / Network Coordination / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 242, RCS2025-178, pp. 175-180, Nov. 2025.
Paper # RCS2025-178 
Date of Issue 2025-11-05 (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 RCS2025-178

Conference Information
Committee AP RCS  
Conference Date 2025-11-12 - 2025-11-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Ehime Prefectural Convention Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceler, MIMO, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2025-11-AP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study of a Coordinated MU-MIMO Canceller by Using SRS 
Sub Title (in English)  
Keyword(1) Mobile Communication  
Keyword(2) MU-MIMO  
Keyword(3) TDD  
Keyword(4) SRS  
Keyword(5) Network Coordination  
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Keyword(8)  
1st Author's Name Ryohei Maeda  
1st Author's Affiliation SoftBank Corp. (SoftBank)
2nd Author's Name Takafumi Fujii  
2nd Author's Affiliation SoftBank Corp. (SoftBank)
3rd Author's Name Teruya Fujii  
3rd Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2025-11-14 12:00:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2025-178 
Volume (vol) vol.125 
Number (no) no.242 
Page pp.175-180 
#Pages 6 
Date of Issue 2025-11-05 (RCS) 

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