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Paper Abstract and Keywords
Presentation 2022-06-15 11:25
Inter-HAPS Interference Reduction Technique Using Subarrayed Cylindrical Antenna with Nullforming
Koji Tashiro, Kenji Hoshino, Atsushi Nagate (SoftBank) RCS2022-28
Abstract (in Japanese) (See Japanese page) 
(in English) High-altitude platform stations (HAPS) have attracted much attention as a leading technology for coverage extension in the sixth generation (6G) mobile communications. In the case where multiple neighboring HAPSs share a common frequency band, signals from one HAPS could interfere with users connected to another HAPS or a terrestrial base station (BS). This paper proposes a novel precoding scheme for simultaneously suppressing inter-HAPS interference and interference from HAPS to terrestrial BSs, targeting a cylindrical array antenna that realizes a wide coverage such as a radius of 100 km. The proposed scheme first creates multiple virtual linear subarrays with vertical elements of a cylindrical array antenna to mitigate the interference toward other service areas by forming elevation nulls with the subarrays. Multiple null points are then created toward terrestrial BSs, and user-specific beams are finally formed. Results show that the proposed scheme improves signal-to-interference-plus-noise ratio of HAPS systems by at most 7.5 dB and that of terrestrial cells by at most 10 dB, compared with conventional precoding schemes without nullforming using subarrays.
Keyword (in Japanese) (See Japanese page) 
(in English) high-altitude platform station (HAPS) / nullforming / subarray / service link / 6G / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 73, RCS2022-28, pp. 25-30, June 2022.
Paper # RCS2022-28 
Date of Issue 2022-06-08 (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 RCS2022-28

Conference Information
Committee RCS  
Conference Date 2022-06-15 - 2022-06-17 
Place (in Japanese) (See Japanese page) 
Place (in English) University of the Ryukyus, Senbaru Campus and online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2022-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Inter-HAPS Interference Reduction Technique Using Subarrayed Cylindrical Antenna with Nullforming 
Sub Title (in English)  
Keyword(1) high-altitude platform station (HAPS)  
Keyword(2) nullforming  
Keyword(3) subarray  
Keyword(4) service link  
Keyword(5) 6G  
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1st Author's Name Koji Tashiro  
1st Author's Affiliation SoftBank Corp. (SoftBank)
2nd Author's Name Kenji Hoshino  
2nd Author's Affiliation SoftBank Corp. (SoftBank)
3rd Author's Name Atsushi Nagate  
3rd Author's Affiliation SoftBank Corp. (SoftBank)
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Speaker Author-1 
Date Time 2022-06-15 11:25:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2022-28 
Volume (vol) vol.122 
Number (no) no.73 
Page pp.25-30 
#Pages 6 
Date of Issue 2022-06-08 (RCS) 

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