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Paper Abstract and Keywords
Presentation 2017-10-24 14:00
[Poster Presentation] A Study on Beam Pattern of Array with Multi-User MIMO Using Null-Space Expansion Tolerant to Channel Fluctuation
Hironori Ban, Daisuke Motegi, Makoto Taromaru, Mai Ohta (Fukuoka Univ.) SR2017-89 SRW2017-39
Abstract (in Japanese) (See Japanese page) 
(in English) Some papers reported that a zero-forcing (ZF) adaptive array antenna or multi-user MIMO system can be robust against channel variation due to fading and/or movement of the interfering terminals when the combining weights are set to cancel not only the most recent channels but also the previous ones of the interferences. This method is called "Null-Space Expansion" and proposed by NTT. This report discusses the mechanism canceling the interferences focusing on the relation between the beam pattern formed by the MIMO weight and the incident waves of the propagation model. This report shows by computer simulations that the ZF weight vector both for the latest past interference channels additional to the present one is inclined to form nulls toward angle of arrival (AoA) of each the incident waves and the direct (line-of-sight) wave from the interference terminals. We also evaluate and discuss this phenomenon with the theoretical expressions. Those studies explain that Null-Space Expansion can be tolerant to channel fluctuation because the combining weight forms the beam pattern with nulls toward the AoA of each incident wave of the interferences which moves much slower than the phase fluctuation due to Doppler shift.
Keyword (in Japanese) (See Japanese page) 
(in English) adaptive array antenna / MIMO / beam pattern / zero-forcing / null space / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 257, SR2017-89, pp. 63-64, Oct. 2017.
Paper # SR2017-89 
Date of Issue 2017-10-16 (SR, SRW) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 SR2017-89 SRW2017-39

Conference Information
Committee SR SRW  
Conference Date 2017-10-23 - 2017-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Grand Hotel Palatino, Rome, Italy 
Topics (in Japanese) (See Japanese page) 
Topics (in English) SmartCom2017 
Paper Information
Registration To SR 
Conference Code 2017-10-SR-SRW 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Beam Pattern of Array with Multi-User MIMO Using Null-Space Expansion Tolerant to Channel Fluctuation 
Sub Title (in English)  
Keyword(1) adaptive array antenna  
Keyword(2) MIMO  
Keyword(3) beam pattern  
Keyword(4) zero-forcing  
Keyword(5) null space  
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1st Author's Name Hironori Ban  
1st Author's Affiliation Fukuoka University (Fukuoka Univ.)
2nd Author's Name Daisuke Motegi  
2nd Author's Affiliation Fukuoka University (Fukuoka Univ.)
3rd Author's Name Makoto Taromaru  
3rd Author's Affiliation Fukuoka University (Fukuoka Univ.)
4th Author's Name Mai Ohta  
4th Author's Affiliation Fukuoka University (Fukuoka Univ.)
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Speaker Author-3 
Date Time 2017-10-24 14:00:00 
Presentation Time 120 minutes 
Registration for SR 
Paper # SR2017-89, SRW2017-39 
Volume (vol) vol.117 
Number (no) no.257(SR), no.258(SRW) 
Page pp.63-64(SR), pp.57-58(SRW) 
#Pages
Date of Issue 2017-10-16 (SR, SRW) 


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