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Offset Variable Pulse Width Modulation for Smart Device Flash Light

This proposal introduces Offset Variable Pulse Width Modulation (Offset-VPWM) for smart device flash lights. It discusses the time delay phenomena in app-based flash light control and presents the concept of Offset-VPWM. The conclusion highlights the potential applications of Offset-VPWM in optical wireless communication, authentication, and location-based services.

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Offset Variable Pulse Width Modulation for Smart Device Flash Light

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Offset Variable Pulse Width Modulation for Smart Device Flash Light Date Submitted: 10 January, 2016 Source:Jaesang Cha, Soonho Jung [Seoul National University of Science & Technology] Address : Seoul National University of Science & Technology [SNUST], Seoul, Korea Voice: +82-2-970-6431, FAX: +82-2-970-6123, E-Mail: chajs@seoultech.ac.kr Re: Response to Call For IEEE802.15.7r1 Proposal on November 2015 Abstract: Offset Variable Pulse Width Modulation for Smart Device Flash Light is proposed. Purpose: Call for Proposal to IEEE 802.15.7r1 Optical Wireless Communication Response Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 1

  2. Contents • Introduction • App based Flash Light Control time delay phenomena • Offset-VPWM • Conclusion Jaesang Cha, Seoul National Univ. of Science&Tech

  3. Introduction (1) • Low rate OWC(such as LED-ID, OCC) can be sent via low rate PD or image sensor communication • Below picture is a example of Smart Devices • - Left one shows low rate PD communication - Right one shows image sensor communication

  4. Introduction (2) Cloud • Hybird Tx: Smart device LED Flash Light & RF (3G/LTE, WiFi, Bluetooth etc.) • Hybrid Rx : Smart device Camera & RF (3G/LTE, WiFi, Bluetooth etc.) Storage Server ID Server OWC + RF Camera + RF LED Flash Light+RF - Flash Light’s data : OWC IP address Pointer (URL, Storage address etc.) - RF data : High rate based access function to Virtual Cloud Big Data Network(Storages) - Virtual Big data exchange(Flexible IoT solution) is available using Hybrid mode

  5. Introduction (3) • Proposed Flash Light Tx structure support both LED-ID and OCC • LED-ID case : Rx is PD • OCC case ; Rx is Camera

  6. Introduction (4) • Authentication using Smart-Device Flash Light and Camera • LBS using Smart-Device Flash Light and Camera LED Light Gateway (Camera) Smart Device Smart Device (LBS)

  7. App based Flash Light Control time delay phenomena (1) • Smart Device App operating on non-real-time OS, Symbol Duration is not constant(Time Jitter like phenomena occurred in the signal) • That is, the cause of ON/OFF time (jitter like)deviation problems is require irregular processing time of OS • Signal characteristic specific new Modulation/Line Coding method is required Symbol duration

  8. App based Flash Light Control time delay phenomena (2) ReadyProcessor Process Descriptor Counter Prepare List Dispatcher Context switching CPU Running Process • OS allocates each App process’s time and decide task procedure. • Flash Light signals using App structure are affected by Various Sequential and Interrupt Process

  9. Offset-VPWM (1) • Tx time is not periodic because of App based Flash Light Control time delay • Rx can't synchronize to tx signal by itself • Rx can detect well start time of tx signal and its duration • There, Pulse width based Modulation/Line Coding, called Using offset-VPWM, is proposed. • Pulse width of Tx signal can be calculated via "Unit Pulse width"+ "Data Pulse width" Unit Pulse width(P) Data Pulse width (nv) Unit variant width (v)

  10. Offset-VPWM (2) • Case study of 4bit Symbol based Offset-VPWM • - Every symbols are matched one of Offset-VPWM signal as below • mapping table

  11. Detailed structure of Offset-VPWM(TBD) • Maybe updated later Jaesang Cha, Seoul National Univ. of Science&Tech.

  12. Structure of PHY and MAC(TBD) • Maybe updated later Jaesang Cha, Seoul National Univ. of Science&Tech.

  13. Simulation result of Offset-VPWM(TBD) • Maybe updated later Jaesang Cha, Seoul National Univ. of Science&Tech.

  14. Conclusion • Offset Variable Pulse Width Modulation for Smart Device Flash Light isproposed • Offset-VPWM can support both LED-ID and OCC • Offset-VPWM can be used for OWC/RF Hybrid method, Authentication, LBS and etc. Jaesang Cha, Seoul National Univ. of Science&Tech.

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