1. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. 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 discussio n 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, a mend 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. Slide 1 Jaesang Cha, Seoul National Univ. of Science & Tech. January 2016

2. Submission Doc: IEEE 802. 15-16-0026-00-007a Slide 2 Contents Introduction App based Flash Light Control time delay phenomena Offset-VPWM Conclusion Jaesang Cha, Seoul National Univ. of Science&Tech January 2016

3. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 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 January 2016

4. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 4 Introduction (2) Hybird Tx: Smart device LED Flash Light & RF (3G/LTE, WiFi, Bluetooth etc.) Hybrid Rx : Smart device Camera & RF (3G/LTE, WiFi, Bluetooth etc.) LED Flash Light+RF Camera + RF OWC + RF January 2016 - 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 Storage Server ID Server Cloud

5. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 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 January 2016

6. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 6 Introduction (4) Authentication using Smart-Device Flash Light and Camera LBS using Smart-Device Flash Light and Camera January 2016 LED Light Smart Device (LBS) Gateway (Camera) Smart Device

7. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 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 January 2016

8. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 8 CounterPrepare ListDispatcher Context switching Ready Processor CPU Process Descriptor Running Process January 2016 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 App based Flash Light Control time delay phenomena (2)

9. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 9 January 2016 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) Unit variant width (v) Data Pulse width (nv)

10. Submission Doc: IEEE 802. 15-16-0026-00-007a Jaesang Cha, Seoul National Univ. of Science & Tech. Slide 10 HEXData bit(Binary)Representation 000001(P+0v), 0(P+7v) 100011(P+1v), 0(P+6v) 200101(P+2v), 0(P+5v) 300111(P+3v), 0(P+4v) 401001(P+4v), 0(P+3v) 501011(P+5v), 0(P+2v) 601101(P+6v), 0(P+1v) 701111(P+7v), 0(P+0v) 810000(P+0v), 1(P+7v) 910010(P+1v), 1(P+6v) A10100(P+2v), 1(P+5v) B10110(P+3v), 1(P+4v) C11000(P+4v), 1(P+3v) D11010(P+5v), 1(P+2v) E11100(P+6v), 1(P+1v) F11110(P+7v), 1(P+0v) January 2016 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. Submission Doc: IEEE 802. 15-16-0026-00-007a Slide 11 Jaesang Cha, Seoul National Univ. of Science&Tech. January 2016 Detailed structure of Offset-VPWM(TBD)  Maybe updated later

12. Submission Doc: IEEE 802. 15-16-0026-00-007a Slide 12 Jaesang Cha, Seoul National Univ. of Science&Tech. January 2016 Structure of PHY and MAC(TBD)  Maybe updated later

13. Submission Doc: IEEE 802. 15-16-0026-00-007a Slide 13 Jaesang Cha, Seoul National Univ. of Science&Tech. January 2016 Simulation result of Offset-VPWM(TBD)  Maybe updated later

14. Submission Doc: IEEE 802. 15-16-0026-00-007a Slide 14 Conclusion Offset Variable Pulse Width Modulation for Smart Device Flash Light is proposed 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. January 2016