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1 doc.: IEEE 802.15-<doc#> <month year>doc.: IEEE <doc#>January 2016Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)Submission Title: Offset Variable Pulse Width Modulation for Smart Device Flash LightDate Submitted: 10 January, 2016Source: Jaesang Cha, Junghoon Lee, Seonhee Lee, Soo-Young Chang and Soonho Jung [SNUST]Address : Seoul National University of Science & Technology [SNUST], Seoul, KoreaVoice: , FAX: ,Re: Response to Call For IEEE r1 Proposal on November 2015Abstract: Offset Variable Pulse Width Modulation for Smart Device Flash Light is proposed.Purpose: Call for Proposal to IEEE r1 Optical Wireless Communication ResponseNotice: This document has been prepared to assist the IEEE P 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 PSlide 1Jaesang Cha, Seoul National Univ. of Science & Tech.<author>, <company>
2 Contents Introduction 6/18/2018<month year>January 2016ContentsIntroductionApp. based Smart Device Light(Flash, etc.) ControlComparison App. based Flash Light control with HW Modem based Light controlOffset-VPWMBER PerformanceConclusionJaesang Cha, Seoul National Univ. of Science&Tech
3 Introduction (1) Smart Device Light (Flash, etc.) based OWC January 2016Introduction (1)Smart Device Light (Flash, etc.) based OWCAnother DeviceCameraSmart DeviceCameraSmart Device(App based Tx )Low Speed PD
4 January 2016Introduction (2)Low rate OWC (such as LED-ID and OCC) can be sent by Device Light and can be received by low rate PD or Camera.Below picture is an example of Smart Devices.- Left one shows low rate PD communication.- Right one shows Camera communication.
5 January 2016Introduction (3)Proposed OWC/RF Hybrid mode can access High rate data from cloud by OWC address Pointer(URL, Address etc.)Hybrid Tx : Smart device Light(Flash, etc.) & RF(3G/LTE, WiFi, Bluetooth etc.)Hybrid Rx : Smart device Camera & RF(3G/LTE, WiFi, Bluetooth etc.)Cloud NetworkConnect byWi-Fi/BTSmart Device Light + RFCamera + RFLink, URL,IP Address, etc- Smart Device 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
6 Introduction (4) Authentication using Smart-Device Light and Camera January 2016Introduction (4)Authentication using Smart-Device Light and CameraLBS using Smart-Device Light(using Offset-VPWM) and CameraLED LightSmart Device(LBS)Gateway(Camera)Smart Device
7 App. based Smart Device Light Control(1) January 2016App. based Smart Device Light Control(1)DLT<SW structure of Smart Device ><SW structure of Smart Device + Flash Light Tx App. >Proposed scheme is App. based Device Light system without HW changeJust have only to add(install) “Device light transmitter(DLT)” App.
8 App. based Device Light Control(2) January 2016App. based Device Light Control(2)App. (Application)Device Light(Flash, etc.) control App.: Light on/off control by calling framework IOMain control block for Device light controlFrame Work(Light IO IF)SWDevice Light IO interface: Calling Devie Light driverKernel layer(S/W Driver)Flash Light IO interface: On/Off Control of deviceFlash device, etc.HWTurn on or off lightApp. is main control block for Device Light(Flash, etc.) control
9 January 2016Comparison App. based Flash Light control with HW Modem based Light control(1)HW modem based light control system can turn on/off light at absolutely exact time duration due to HW clock synchronizationApp. based light control can’t keep turning on/off timing because it is performed by CPU
10 January 2016Comparison App. based Flash Light control with HW Modem based Light control(2)HW modem basedlight controlApp. based FlashExact time spanfalling edgerising edgeApp. based Flash control can’t keep exact on/off timing when context switching process, ISR(interrupt service routine), and so on…It can happen both rising and falling edge time
11 January 2016Offset-VPWM (1)In order to overcome Jitter problem, we propose new modulation scheme Offset-VPWM(Variable Pulse Width Modulation)In Offset-VPWM, Data is expressed with offset pulse widthFor example,2bits data were mapped into 4 Offset-VPWM symbol as below< Mapping Table>Data bitsPulse width00P01P+V10P+2V11P+3V< Offset-VPWM scheme>
12 January 2016Offset-VPWM (2)Even though rising edge jitter happened, receiver can synchronize rising edge and check pulse width length
13 January 2016Offset-VPWM (3)If falling edge jitter happened, it can affect BER performanceFor example,When sending ’00’,If Tx signals falling edge happened with short pulse width(v)then Rx’s decision making error is occurred (00 01)Pfalling edge0 000 01v0 1Efficient offset value design is needed considering the relation falling jitter and pulse width
14 The number of simulation data January 2016BER Performance(1)P is 40ms*Falling edge is varied from 0%~5% of POffset length(v) is varied from 10~50% of P<Simulation Parameters>ItemValuemodulationOffset-VPWMP40msFalling edge jitter0, 1, 2, 3, 4, 5% of PPWM offset length(v)10, 20, 30, 40, 50% of PThe number of simulation data< Offset-VPWM scheme>*P value 40ms is calculated via (1second) / (the number of flash blinking)The number of blinking is the capacity how often mobile device can turn flash on and off means that the frequency which was tested using Nexus5S device.
15 BER Performance(2) January 2016 <Pulse offset length 10% of P>
16 6/18/2018<month year>January 2016ConclusionsOffset Variable Pulse Width Modulation for Smart Device Light(Flash, etc.) are proposedProposed scheme is App. based Device Light system without HW change Just have only to add(install) “Device light transmitter(DLT)” App.Offset-VPWM can be applied on LED-ID and OCCApplication scenarios like OWC/RF Hybrid method, Authentication, LBS were introducedSmart Device based/connected Multiple Device Lights also can be appliedJaesang Cha, Seoul National Univ. of Science&Tech.