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Paper Abstract and Keywords
Presentation 2024-05-30 10:50
Performance Analysis of Null-Space Expansion in Line-of-Sight Environment
Kazuki Maruta (Tokyo Univ. of Science), Koji Ikuta (Kyocera) RCS2024-16
Abstract (in Japanese) (See Japanese page) 
(in English) Null-space expansion (NSE) has been proposed as a method for multi-user MIMO that is tolerant to the user mobility environment. NSE is performed in the presence of temporal and spatial correlations by using the channel state information (CSI) estimated between the base station (BS) and the user equipment (UE). Interference suppression is achieved even for future channel states that may change due to user mobility. This is achieved by exploiting the enormous spatial degrees of freedom in massive MIMO, where the BS is equipped with multi-element antennas. The effectiveness of NSE has been qualitatively explained, but its principles have not been clearly presented. In this paper, the effectiveness of NSE is discussed based on the beam patterns and sidelobe shapes formed by array antennas in basic antenna arrangements such as line-of-sight propagation environments and linear array arrangements. The conditions for the effective operation of NSE are clarified in relation to the array aperture due to the number of antenna elements.
Keyword (in Japanese) (See Japanese page) 
(in English) Massive MIMO / Multiuser MIMO / Null-space expansion / / / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 52, RCS2024-16, pp. 13-18, May 2024.
Paper # RCS2024-16 
Date of Issue 2024-05-23 (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 RCS2024-16

Conference Information
Committee IN RCS NV  
Conference Date 2024-05-30 - 2024-05-31 
Place (in Japanese) (See Japanese page) 
Place (in English) Fukuoka University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Ad-Hoc/Sensor Networks/MANET, Mobile Networks, M2M/IoT Communications, Wi-Fi, IEEE802.15(ZigBee) and others 
Paper Information
Registration To RCS 
Conference Code 2024-05-IN-RCS-NV 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance Analysis of Null-Space Expansion in Line-of-Sight Environment 
Sub Title (in English)  
Keyword(1) Massive MIMO  
Keyword(2) Multiuser MIMO  
Keyword(3) Null-space expansion  
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1st Author's Name Kazuki Maruta  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Koji Ikuta  
2nd Author's Affiliation Kyocera Corporation (Kyocera)
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Speaker Author-1 
Date Time 2024-05-30 10:50:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2024-16 
Volume (vol) vol.124 
Number (no) no.52 
Page pp.13-18 
#Pages 6 
Date of Issue 2024-05-23 (RCS) 

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