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 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) |
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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) |
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Keyword(1) |
adaptive array antenna |
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MIMO |
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beam pattern |
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zero-forcing |
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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 |
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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 |
2 |
Date of Issue |
2017-10-16 (SR, SRW) |
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