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Paper Abstract and Keywords
Presentation 2022-07-28 09:50
A Study on Null Formation Control for Interference Suppression on High-Altitude Platforms Comprising Space-Air-Ground Integrated Network
Yuto Okawara, Yuichi Kawamoto, Nei Kato (Tohoku Univ) SAT2022-22
Abstract (in Japanese) (See Japanese page) 
(in English) Since one of the 6G requirements is to provide global and ubiquitous coverage, there is an urgent need to cover unreachable areas by current mobile communications systems. SAGIN (Space-Air-Ground Integrated Network) has been attracting attention to enable global and ubiquitous coverage. Hence, in this study, we assume a SAGIN in which HAPS act as a relay for uploading data to satellite and forwarding data to the ground terminals (GT) over shared frequencies. However, the backlobes of the satellite uplink can interfere with the downlink to the GT, which can degrade communication quality. Therefore, previous studies have proposed interference suppression methods using directivity control of array antennas in SAGIN, but the number and location of ground terminals to suppress interference are not studied. In a real environment, the number of generated nulls is smaller than the number of GTs, which makes it impossible to direct nulls to all GTs. Thus, we propose a method for selection of the location of the null point while considering the effect of GTs' position. We also examine the impact of interference suppression on ground terminals according to the location of the null formation.
Keyword (in Japanese) (See Japanese page) 
(in English) Space-Air-Ground Integrated Network / Interference suppression / Frequency Sharing / Null Formation Control / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 137, SAT2022-22, pp. 30-34, July 2022.
Paper # SAT2022-22 
Date of Issue 2022-07-20 (SAT) 
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 SAT2022-22

Conference Information
Committee AP SANE SAT  
Conference Date 2022-07-27 - 2022-07-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Asahikawa Taisetsu Crystal Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Remote sensing, Sattelite Communication, Radio propagation, Antennas and Propagation 
Paper Information
Registration To SAT 
Conference Code 2022-07-AP-SANE-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Null Formation Control for Interference Suppression on High-Altitude Platforms Comprising Space-Air-Ground Integrated Network 
Sub Title (in English)  
Keyword(1) Space-Air-Ground Integrated Network  
Keyword(2) Interference suppression  
Keyword(3) Frequency Sharing  
Keyword(4) Null Formation Control  
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1st Author's Name Yuto Okawara  
1st Author's Affiliation Tohoku University (Tohoku Univ)
2nd Author's Name Yuichi Kawamoto  
2nd Author's Affiliation Tohoku University (Tohoku Univ)
3rd Author's Name Nei Kato  
3rd Author's Affiliation Tohoku University (Tohoku Univ)
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Speaker Author-1 
Date Time 2022-07-28 09:50:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2022-22 
Volume (vol) vol.122 
Number (no) no.137 
Page pp.30-34 
#Pages 5 
Date of Issue 2022-07-20 (SAT) 

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