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Doc: IEEE 802-15-14-0540-00-007a. Project: IEEE 802.15.7a 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** ]

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  1. Doc: IEEE 802-15-14-0540-00-007a Project: IEEE 802.15.7a OCC Study Group Submission Title:[Demodulation of Variable PPM & Its Application to OCC] Date Submitted: [15 Sep., 2014] Source:[JaesangCha*, 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: [82-2-970-6431], FAX: [82-2-970-6123], E-Mail:[chajs@seoultech.ac.kr] Re: [] Abstract:[Demodulation of Variable PPM & Its Application to OCC] Purpose: [Contribution to IEEE 802.15.7a Optical Camera Communication] Notice: This document has been prepared to assist the IEEE 802.15. It is offered as a basis fordiscussion 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 802.15 Slide 1 Jaesang Cha, Seoul National Univ. of Science&Tech.

  2. 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 Contents Doc: IEEE 802-15-14-0540-00-007a Jaesang Cha, Seoul National Univ. of Science&Tech.

  3. Doc: IEEE 802-15-14-0540-00-007a VPPM (Variable PPM) Technology • Included in IEEE 802.15.7 • Appropriate for dimming control during digital data transmission Jaesang Cha, Seoul National Univ. of Science&Tech.

  4. Doc: IEEE 802-15-14-0540-00-007a 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. Doc: IEEE 802-15-14-0540-00-007a 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. Doc: IEEE 802-15-14-0540-00-007a 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. Doc: IEEE 802-15-14-0540-00-007a 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. Doc: IEEE 802-15-14-0540-00-007a 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. Doc: IEEE 802-15-14-0540-00-007a 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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