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Paper Abstract and Keywords
Presentation 2024-03-13 09:55
User Scheduling based on Expanded Null-Space for Massive MIMO
Yuki Sasaki (Tokyo Univ. of Scince), Kabuto Arai (The Univ. of Electro-Communications), Jin Nakazato (UTokyo), Kazuki Maruta (Tokyo Univ. of Scince) RCS2023-250
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a user scheduling scheme for multi-user massive MIMO (MU-mMIMO), particularly effective in time-varying channel environments. MU-MIMO enables spectral efficiency enhancement by multiplexing a number of user terminals (UTs) in the spatial domain.
Due to the finite number of base station (BS) antennas, the simultaneous transmission capacity is constrained in MU-MIMO. Therefore, BS must divide UTs into distinct subsets and transmit signals for each subset. When UTs move at high speed, it causes inter-user interference (IUI) and subsequently reduces the spatial multiplexing capability.
Null-space expansion (NSE) fully exploits the spatial degree of freedoms of BS and enhances IUI suppression capability by steering several nulls to interfering UTs.
Effective multi-user scheduling suitable for NSE has not been established so far.
Our proposed approach leverages past CSI of UTs and strategically selects UTs to obtain their maximum individual gains. The performance of proposed and conventional scheduling schemes are compared through computer simulation; its effectiveness is presented.
Keyword (in Japanese) (See Japanese page) 
(in English) Multiuser MIMO / Null-space expansion / User scheduling / / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 434, RCS2023-250, pp. 1-6, March 2024.
Paper # RCS2023-250 
Date of Issue 2024-03-06 (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 RCS2023-250

Conference Information
Committee RCS SR SRW  
Conference Date 2024-03-13 - 2024-03-15 
Place (in Japanese) (See Japanese page) 
Place (in English) The University of Tokyo (Hongo Campus), and online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2024-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) User Scheduling based on Expanded Null-Space for Massive MIMO 
Sub Title (in English)  
Keyword(1) Multiuser MIMO  
Keyword(2) Null-space expansion  
Keyword(3) User scheduling  
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1st Author's Name Yuki Sasaki  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Scince)
2nd Author's Name Kabuto Arai  
2nd Author's Affiliation The University of Electro-Communications (The Univ. of Electro-Communications)
3rd Author's Name Jin Nakazato  
3rd Author's Affiliation The University of Tokyo (UTokyo)
4th Author's Name Kazuki Maruta  
4th Author's Affiliation Tokyo University of Science (Tokyo Univ. of Scince)
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Speaker Author-1 
Date Time 2024-03-13 09:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2023-250 
Volume (vol) vol.123 
Number (no) no.434 
Page pp.1-6 
#Pages 6 
Date of Issue 2024-03-06 (RCS) 

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