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Paper Abstract and Keywords
Presentation 2020-11-25 16:15
[Invited Lecture] Spatially Parallel Signal Transmission in LED Visible Light Wireless Communications
Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara (Okayama Univ.) AP2020-82 RCS2020-121
Abstract (in Japanese) (See Japanese page) 
(in English) The traffic of wireless communication systems has greatly increased due to the expansion of smartphones and IoT. Visible light wireless communications with LED lighting have been researched to meet such increase. This paper evaluates spatially parallel signal transmission with a lot of LED lighting and photodetectors installed in the same place to expand signal transmission bandwidth in LED visible light communications. Transmission performance of each photodetector is evaluated according to LED lighting and photodetector arrangement, and the number of simultaneously receivable signal streams is estimated based on the evaluation results. In the estimation, square-shaped 25 LEDs with 1 m intervals are arranged within an evaluation area of 5 m square, and 9 photodetectors installed at the same place receive their light to realize spatially parallel signal transmission. The number of receivable signal streams is counted by desired-to-undesired signal power ratios of the evaluation points, where the LED with the strongest light is a desired one, and the other LEDs are undesired ones. The results show that 2 or more signal streams can be received at 97 % evaluation points by appropriately setting the angles among photodetectors according to the set LED lighting interval.
Keyword (in Japanese) (See Japanese page) 
(in English) LED / Visible Light Wireless Communications / Spatially Parallel Transmission / / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 249, RCS2020-121, pp. 66-70, Nov. 2020.
Paper # RCS2020-121 
Date of Issue 2020-11-18 (AP, 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)
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Conference Information
Committee RCS AP UWT  
Conference Date 2020-11-25 - 2020-11-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceler, MIMO, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2020-11-RCS-AP-UWT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Spatially Parallel Signal Transmission in LED Visible Light Wireless Communications 
Sub Title (in English)  
Keyword(1) LED  
Keyword(2) Visible Light Wireless Communications  
Keyword(3) Spatially Parallel Transmission  
1st Author's Name Shigeru Tomisato  
1st Author's Affiliation Okayama University (Okayama Univ.)
2nd Author's Name Satoshi Denno  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Kazuhiro Uehara  
3rd Author's Affiliation Okayama University (Okayama Univ.)
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Speaker Author-1 
Date Time 2020-11-25 16:15:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # AP2020-82, RCS2020-121 
Volume (vol) vol.120 
Number (no) no.248(AP), no.249(RCS) 
Page pp.51-55(AP), pp.66-70(RCS) 
Date of Issue 2020-11-18 (AP, RCS) 

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