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Paper Abstract and Keywords
Presentation 2022-03-11 16:00
A Study on Symbol Synchronization for Image Sensor Communication Using Propeller-type Rotary LED Transmitter
Akinori Nakayama, Shintaro Arai (Okayama Univ. of Sci.) IT2021-136 ISEC2021-101 WBS2021-104 RCC2021-111
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we focus on a propeller-type rotary LED transmitter and image-sensor-based visible light communication (i.e., image sensor communication: ISC) using this transmitter. The propeller-type rotary LED transmitter, which is currently under development by us, generates multiple afterimages of light by rotating while blinking the LED light that is the transmitting signal. We use their multiple afterimages to improve the communication speed of ISC. In ISC using this transmitter, we found that a time gap between the symbol start timing of the transmitter and the shutter timing of the camera causes inter-symbol interference, which leads to errors in the demodulated data. To solve this problem, this study proposes a symbol synchronization method for image sensor communication using the propeller-type rotary LED transmitter. Specifically, the transmitter sends a known LED blinking pattern as a header of data. The receiver uses image processing techniques to detect the coordinates of afterimages of the LED lights from the received header pattern. In addition, we detect the symbol synchronization misalignment based on the detected coordinates for the data demodulation. The simulation results show that the proposed method accurately detected both the coordinates of the afterimage and the synchronization error in the range up to 2.5 m communication distance when the LED blinking angles were at 1-degree intervals.
Keyword (in Japanese) (See Japanese page) 
(in English) visible light communication (VLC) / image sensor communication (ISC) / rotary LED transmitter / symbol synchronization misalignment / symbol synchronization method / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 430, WBS2021-104, pp. 307-312, March 2022.
Paper # WBS2021-104 
Date of Issue 2022-03-03 (IT, ISEC, WBS, RCC) 
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 IT2021-136 ISEC2021-101 WBS2021-104 RCC2021-111

Conference Information
Committee IT ISEC RCC WBS  
Conference Date 2022-03-10 - 2022-03-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Joint Meeting of ISEC, IT, RCC, and WBS 
Paper Information
Registration To WBS 
Conference Code 2022-03-IT-ISEC-RCC-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Symbol Synchronization for Image Sensor Communication Using Propeller-type Rotary LED Transmitter 
Sub Title (in English)  
Keyword(1) visible light communication (VLC)  
Keyword(2) image sensor communication (ISC)  
Keyword(3) rotary LED transmitter  
Keyword(4) symbol synchronization misalignment  
Keyword(5) symbol synchronization method  
1st Author's Name Akinori Nakayama  
1st Author's Affiliation Okayama University of Science (Okayama Univ. of Sci.)
2nd Author's Name Shintaro Arai  
2nd Author's Affiliation Okayama University of Science (Okayama Univ. of Sci.)
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Speaker Author-1 
Date Time 2022-03-11 16:00:00 
Presentation Time 25 minutes 
Registration for WBS 
Paper # IT2021-136, ISEC2021-101, WBS2021-104, RCC2021-111 
Volume (vol) vol.121 
Number (no) no.428(IT), no.429(ISEC), no.430(WBS), no.431(RCC) 
Page pp.307-312 
Date of Issue 2022-03-03 (IT, ISEC, WBS, RCC) 

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