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Paper Abstract and Keywords
Presentation 2020-06-25 10:50
Suppression of performance degradation due to misalignment in OAM multiplexing
Nobuhiko Sakuraya, Toshihiko Nishimura, Takeo Ohgane (Hokkaido Univ), Tomoya Tandai, Daisuke Uchida (Toshiba) RCS2020-33
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
to use an uniform circular array (UCA). It is known that the performance deteriorates seriously when there is misalignment between the UCAs at both sides. In this paper, the UCA installation height is shifted on the transmitting
or receiving sides and the UCA surface is slanted on the transmitting or receiving sides. We investigate performance
deterioration and propose a method of improvement. It is found that the channel symmetry was broken by the
slight misalignment, and total throughput can be improved by MMSE weights, while the throughput was degraded
by DFT weights.
Keyword (in Japanese) (See Japanese page) 
(in English) Orbital angular momentum / Uniform circular array / Spatial multiplexing / misalignment / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 74, RCS2020-33, pp. 61-66, June 2020.
Paper # RCS2020-33 
Date of Issue 2020-06-17 (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 RCS2020-33

Conference Information
Committee RCS  
Conference Date 2020-06-24 - 2020-06-26 
Place (in Japanese) (See Japanese page) 
Place (in English) 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 2020-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Suppression of performance degradation due to misalignment in OAM multiplexing 
Sub Title (in English)  
Keyword(1) Orbital angular momentum  
Keyword(2) Uniform circular array  
Keyword(3) Spatial multiplexing  
Keyword(4) misalignment  
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 2020-06-25 10:50:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2020-33 
Volume (vol) vol.120 
Number (no) no.74 
Page pp.61-66 
Date of Issue 2020-06-17 (RCS) 

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