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Paper Abstract and Keywords
Presentation 2021-09-09 14:40
[Invited Talk] Advancement of Multiuser Massive MIMO Null-Space Expansion
Kazuki Maruta (Tokyo Tech) CQ2021-46
Abstract (in Japanese) (See Japanese page) 
(in English) Massive multiple-input multiple-output (MIMO) technology with base stations having more than a hundred antennas has been a promising solution to improve spectral efficiency. Massive array brings the benefit of improving the signal gain by beamforming, especially in the higher frequency band, as well as increasing the number of signal streams for spatial multiplexing. A significant challenge of the multiuser MIMO is the interference leakage among user terminals caused by the channel time variation due to their mobility, which significantly degrades the transmission performance. A previous study proposed a null-space expansion that can maintain the inter-user interference suppression effect even under the mobility environment. It performs null-steering to past interference channel state information, fully exploiting the huge spatial degree of freedom that massive antenna elements bring.
This paper presents the fundamental principle of the null-space expansion scheme, its extension for further capability enhancement, and its potential for advancement.
Keyword (in Japanese) (See Japanese page) 
(in English) Massive MIMO / Null-space expansion / Time varying channel / / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 173, CQ2021-46, pp. 46-46, Sept. 2021.
Paper # CQ2021-46 
Date of Issue 2021-09-02 (CQ) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 CQ2021-46

Conference Information
Committee CQ MIKA  
Conference Date 2021-09-09 - 2021-09-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communications Quality, 6G, IoT, Resource Management, Wireless Transmission, Cross layer Technologies, etc. 
Paper Information
Registration To CQ 
Conference Code 2021-09-CQ-MIKA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Advancement of Multiuser Massive MIMO Null-Space Expansion 
Sub Title (in English)  
Keyword(1) Massive MIMO  
Keyword(2) Null-space expansion  
Keyword(3) Time varying channel  
1st Author's Name Kazuki Maruta  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Date Time 2021-09-09 14:40:00 
Presentation Time 35 
Registration for CQ 
Paper # IEICE-CQ2021-46 
Volume (vol) IEICE-121 
Number (no) no.173 
Page p.46 
#Pages IEICE-1 
Date of Issue IEICE-CQ-2021-09-02 

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