Project: IEEE P Working Group for Wireless Personal Area Networks N

Transcription

1 Project: IEEE P82.15 Working roup for Wireless Personal Area Networks N (WPANs( WPANs) Title: [Color Multiple Coding for VLC] Date Submitted: [7 Nov, 28] Source: [Atsua Yokoi] Compan [Samaung Yokohama esearch ] Address [2-7, Sugasawa-cho, Tsurumi-ku, Yokohama-shi, Kanagawa, Japan] Voice:[ ], FAX: [ ], [atsua.okoi@samsung.com] e: [] Abstract: [The introduction of the Color Multiple Coding (CMC) for VLC and its evaluation results. The E performances are showed b simulation and eperiment.] Purpose: [Contribution to IEEE S-VLC] Notice: 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 stud. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. elease: The contributor acknowledges and accepts that this contribution becomes the propert of IEEE and ma be made publicl available b P Slide 1

2 Color Multiple Coding for VLC Atsua Yokoi Samsung Yokohama esearch Slide 2

3 Contents Introduction What is CMC? Wh CMC? CMC performance Simulation esults Eperiment esults Conclusion Slide 3

4 Introduction WDM (Wave Length Multiple) is a good scheme for realizing high speed transmissions. ut the wave length and number have to be selected carefull, because those decide light devices (LED,PD) and the performance of VLC sstems. WDM sstem depends on the light devices strongl. CMC (Color Multiple Coding) is a new modulation scheme which we propose. It doesn t depend on the wave length and number directl. It can be epected better fleibilit for VLC sstem than WDM. Slide 4

5 What is CMC? Data Color Coding to D/A D/A D/A LED PD CMC sstem block diagram A/D A/D A/D to Color Decoding Data Data train is coded in the color coordinate. values are transformed into values. The relation between and is showed b following equations.(:7nm, :546.1nm, :435.8nm) X = Y = Z = = X /( X = Y /( X + Y+ Z) + Y+ Z) CIE1931 color coordinate CMC smbols are provided as the visible colors which are made b light sources. The information is transmitted as the intensit ratio among. Slide 5

6 Wh CMC? WDM Transmit data is distributed to channels. The channels are decided b the wave length and number. Same wave length sources and detectors are required. Sstem fleibilit is lower. CMC Transmit data is allocated in the color coordinate plane. The channels are decided b the color coordinate. It doesn t depend on the wave length and number directl. Sstem fleibilit is higher. Slide 6

7 Wh CMC? Illumination Sign board Mobile color coordinate Mobile Light source spectrum are different among the various devices. CMC smbols are produced b several light sources according to the color coordinate. CMC smbols can be reproduced b different light sensors. CMC guarantees the connectivit each device with color coordinate. CMC is better for VLC standardization with considering the connectivit among the different devices. Slide 7

8 CMC simulation enarated Signal Simbol for CMC enarated Signal Simbol for CMC enarated Signal Simbol for CMC position position position Simbol position position position position Simbol position position position position Simbol position CMC (2bits/Smbol) CMC (4bits/Smbol) CMC (6bits/Smbol) Smbol position in color coordinate for CMC performance evaluation Those smbol positions were decided for having same distance from adjacent smbols. 4CMC:4points Color Multiple Coding (2bits/smbol) 16CMC:16points Color Multiple Coding (4bits/smbol) 64CMC:64points Color Multiple Coding (6bits/smbol) Slide 8

9 E performance with random noise andom Noise vs. E 1.E+ 1.E-1 1.E-2 4CMC 16CMC 64CMC 2WDM 4WDM E 1.E-3 64CMC smbol positions ( plane) 1.E-4 1.E-5 1.E SN_ [d] 2WDM:2level(On-Off)/color WDM (3bits/smbol) with andom Noise 4WDM:4level/color WDM (6bits/smbol) with andom Noise 4WDM smbol positions ( space) 64CMC and 4WDM have same abilit for transmitting speed ratio (6bits/smbol). ( CMC has 3d lower E performance in the random noise environment. Slide 9

10 E performance with common mode noise andom Noise & Common mode Noise vs. E 1.E+ 1.E-1 1.E-2 4WDM_r3 2WDM_r3 4CMC_r3 16CMC_r3 64CMC_r3 E 1.E-3 1.E-4 1.E-5 1.E SN_ [d] 64CMC_r3:64points CMC(6bits/smbol) with andom Noise & +3d Common mode Noise 4WDM_r3:4level/color WDM (6bits/smbol) with andom Noise & +3d Common mode Noise 64CMC and 4WDM have same abilit for transmitting speed ration. CMC has 1.5d higher E performance in the common mode noise environment nment. Slide 1

11 PC Software Hardware CMC Eperiment Digital board Transmitter FPA DAC DAC DAC ch1 ch2 ch3 LED:UV136L VLC-T Front-end CMC Algorithm Driver US I/F HDD US 2. US I/F eceiver ADC FPA ADC ADC ch1 ch2 ch3 VLC- Front-end Light Prop. VLC Test ed Slide 11 PD:S972

12 Eperimental esults (2.5MHz/Smbol) Simbol for CMC with smbol points (datadem) Simbol for CMC with smbol points (datadem) Simbol for CMC with smbol points (datadem) position position position Smbol position position position position Smbol position position position position Smbol position CMC (5Mbps) E < CMC (1Mbps) E < 1-6 Slide CMC (15Mbps) E 1-4

13 Eperimental esults (5MHz/Smbol) Simbol for CMC with smbol points (datadem) Simbol for CMC with smbol points (datadem) Simbol for CMC with smbol points (datadem) position position position Smbol position position position position Smbol position position position position Smbol position CMC (1Mbps) E < CMC (2Mbps) E < CMC (3Mbps) E 1-3 Slide 13

14 Eperimental esults (1MHz/Smbol) Simbol for CMC with smbol points (datadem) Simbol for CMC with smbol points (datadem) Simbol for CMC with smbol points (datadem) position position position Smbol position position position position Smbol position position position position Smbol position CMC (2Mbps) E < CMC (4Mbps) E 1-2 Slide CMC (6Mbps) E > 1-1

15 Eperimental esults E performance 1.E+ 1.E-1 64CMC E 1.E-2 1.E-3 1.E-4 64CMC 64CMC 16CMC 1.E-5 1.E-6 4/16CMC 4/16CMC 1.E it ate [Mbps] 4CMC:4points Color Multiple Coding (2bits/smbol) 16CMC:16points Color Multiple Coding (4bits/smbol) 64CMC:64points Color Multiple Coding (6bits/smbol) Slide 15

16 Conclusion We proposed CMC as a new modulation scheme. CMC can provide more fleible VLC sstem than WDM. CMC has better performance than WDM in some case. We confirmed 2Mbps transmission on 16CMC. We can epect higher transmission speed b using the device (LED, PD) which has wider frequenc band. Slide 16

17 Thank ou for our attention! Slide 17