1. September 2009doc.: IEEE 802.15-09-0117-00-0007
<month year>
9/12/2018<month year>
doc.: IEEE
Doc: IEEE a
Sep 2014
Project: IEEE a OCC Study Group
Submission Title: [Demodulation of Variable PPM & Its Application to OCC]
Date Submitted: [15 Sep., 2014]
Source: [Jaesang Cha*, Jonghyeok Lee*, Yeong Min Jang**, Youngil Park**]
[*Seoul National Univ. of Science & Technology, **Kookmin Univ.]
Address : [Seoul National University of Science & Technology, Seoul, Korea]
Voice: [ ], FAX: [ ],
Re: []
Abstract: [Demodulation of Variable PPM & Its Application to OCC]
Purpose: [Contribution to IEEE a Optical Camera Communication]
Notice: This document has been prepared to assist the IEEE It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by IEEE
Slide 1
Jaesang Cha, Seoul National Univ. of Science&Tech.
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2. September 2009doc.: IEEE 802.15-09-0117-00-0007
9/12/2018<month year>
Sep 2014
Doc: IEEE a
Contents
VPPM (Variable PPM) Technology
Demodulation Scheme of VPPM Using Correlation Mask
Demodulation Process of VPPM
Experiment Results of VPPM
VPPM for Optical Camera Communications
Conclusion
Jaesang Cha, Seoul National Univ. of Science&Tech.

3. VPPM (Variable PPM) Technology
Doc: IEEE a
Sep 2014
VPPM (Variable PPM) Technology
Included in IEEE
Appropriate for dimming control during digital data transmission
Jaesang Cha, Seoul National Univ. of Science&Tech.

4. Demodulation Scheme of VPPM Using Correlation Mask
Doc: IEEE a
Sep 2014
Demodulation Scheme of VPPM Using Correlation Mask
Brightness is measured in the first stage of the receiver
Mask-1 and Mask-0 are made in real time and used for correlation receiver
Jaesang Cha, Seoul National Univ. of Science&Tech.

5. Demodulation Procedure of VPPM
Doc: IEEE a
Sep 2014
Demodulation Procedure of VPPM
Shows the signal at each part of the figure in previous page
Data is recovered from each VPPM signal with one-bit delay
Jaesang Cha, Seoul National Univ. of Science&Tech.

6. Experiment Results of VPPM
Doc: IEEE a
Jan 2014
Experiment Results of VPPM
Experiment using Photodiode was performed with 70% brightness
Transmitted data d(t) is well recoverd using the proposed scheme
Jaesang Cha, Seoul National Univ. of Science&Tech.

7. Experiment Results of VPPM
Doc: IEEE a
Jan 2014
Experiment Results of VPPM
15 Watt LED, PD with active area 13.0mm×13.0mm
Best performance observed at 50% brightness
Jaesang Cha, Seoul National Univ. of Science&Tech.

8. VPPM for Optical Camera Communications
Doc: IEEE a
Sep 2014
VPPM for Optical Camera Communications
Scan line of image sensor using Rolling Shutter
Scan-line width varies with dimming of VPPM modulated data
Signal transmission is possible regardless of LED dimming
Same demodulation scheme, correlation-based receiver, also can be used in OCC
Jaesang Cha, Seoul National Univ. of Science&Tech.

9. September 2009doc.: IEEE 802.15-09-0117-00-0007
9/12/2018<month year>
Doc: IEEE a
Sep 2014
Conclusion
In this submission, we propose a VPPM demodulation scheme using correlation mask.
Transmission was successful with LED and photodiode regardless of dimming level; however, best performance was achieved at 50% brightness.
The same correlation-based demodulaton can be applied to optical camera communication.
Jaesang Cha, Seoul National Univ. of Science&Tech.
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