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Paper Abstract and Keywords
Presentation 2021-03-05 16:55
Compensation for axis misalignment of UCA with OAM beam control
Nobuhiko Sakuraya, Toshihiko Nishimura, Takeo Ohgane (Hokkaido Univ), Tomoya Tandai, Daisuke Uchida (Toshiba) RCS2020-260
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, mobile data traffic has increased explosively due to increasing wireless devices. Capacity enhancement is required for fronthaul and backhaul accordingly.
Spatial multiplex transmission using orbital angular momentum (OAM) has been attracting attention as a solution.
One of the OAM multiplexing methods is the use of uniform circular array (UCA).
It is known that the performance deteriorates seriously if there are misalignments of the UCA at transmitter and/or receiver.
In this paper, we propose a method of compensation for the degradation with beam control and/or MMSE weights in the case that the UCA installation height is shifted on the transmitter or receiver and the UCA surface is slanted on the transmitter.
Specifically, the received power is increased by adjusting the main beam toward the transmit UCA to compensate for the degradation.
It is found that by using beam control, total throughput is improved compared to using only MMSE weights.
By using the beam control method together, it was found that the method can be applied to a wide range of angles.
Keyword (in Japanese) (See Japanese page) 
(in English) Orbital angular momentum / Uniform circular array / Spatial multiplexing / misalignment / beam control / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 404, RCS2020-260, pp. 261-266, March 2021.
Paper # RCS2020-260 
Date of Issue 2021-02-24 (RCS) 
ISSN Online edition: ISSN 2432-6380
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 RCS2020-260

Conference Information
Committee RCS SR SRW  
Conference Date 2021-03-03 - 2021-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2021-03-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Compensation for axis misalignment of UCA with OAM beam control 
Sub Title (in English)  
Keyword(1) Orbital angular momentum  
Keyword(2) Uniform circular array  
Keyword(3) Spatial multiplexing  
Keyword(4) misalignment  
Keyword(5) beam control  
1st Author's Name Nobuhiko Sakuraya  
1st Author's Affiliation Hokkaido University (Hokkaido Univ)
2nd Author's Name Toshihiko Nishimura  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ)
3rd Author's Name Takeo Ohgane  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ)
4th Author's Name Tomoya Tandai  
4th Author's Affiliation Toshiba (Toshiba)
5th Author's Name Daisuke Uchida  
5th Author's Affiliation Toshiba (Toshiba)
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Speaker Author-1 
Date Time 2021-03-05 16:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2020-260 
Volume (vol) vol.120 
Number (no) no.404 
Page pp.261-266 
Date of Issue 2021-02-24 (RCS) 

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