1. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: MIMO-VLC scheme for Scalable Data Rate Transmission Date Submitted: September 2009 Source: * Kye San Lee [Kyunhee Univ] **.Jae Sang Cha[ Seoul National Univ. Of Technology], ***Yeong Min Jang[ Kookmin Univ.] Dong Ho Cha [Kyunhee Univ], Su Jin Bae[Kyunghee Univ.] Address Voice:82-10-4455-4370, 5624, E-Mail: * kyesan@khu.ac.kr, ** chajs@snut.ac.kr, **yjang@kookmin.ac.kr Re: Abstract:MIMO-VLC scheme for Scalable Data Rate Transmission Purpose: 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.

2. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 2 Background : Visible Light Communication system(VLC) Combined system with LED Lighting & Communication with some advantages as low power consumption longer lifetime small size etc Visible LED light has higher power than IR wireless comm. New Green comm. Tech. No EMI/EMC to human body + Demand of VLC applications (Multimedia services,P2P service etc.) require more increased (high) data transmission

3. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 3 Application example : Mobile to Mobile Service (P2P) using Bluetooth or UWB Bluetooth : 2Mbps (Low rate) UWB :450 Mbps (High rate) However, EMI & Frequency interference problems are severe MIMO-VLC scheme with Scalable Data Rate transmission structure could be one solution of above limitations

4. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 4 Proposed system Scalable data rate : < 1G bps MIMO-VLC Scheme based on VLC with OFDM & MIMO technology. It does not suffer from EMI.

5. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 5 Proposed system Could accommodate the increased demand of Multimedia services. Could achieve Scalable (High/Medium/Low) Date Transmission. Use OFDM & MIMO technology. Use Multiplexing technique using R,G,B LED waves

6. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 6 System Description. Transmission Side Receiver Side

7. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 7 System Description. Diversity Gain Scheme. ① Transmit different data - increase data rate ② Transmit same data - frequency diversity

8. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 8 Fig. 1-1. VLC-MIMO scheme in the Case of ①. 1-chip LED Concept of MIMO-VLC

9. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 9 Fig. 1-2. VLC-MIMO scheme in the case of ②. Fig. 1-3. VLC-MIMO scheme in the case of ③. Concept of MIMO-VLC

10. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 10 Semiangle at half power FOV of a terminal Physical area of a PD 60.0[deg] 74.0[deg] 1.0[cm 2 ] Optical modulation Primary modulation Original data rate of each color Original data rate of 1chip Background light noise Optical channel model IM-DD OFDM-BPSK 400[Mbps] 0.0[dBm] Directed LOS path (only AWGN channel) O/E conv. Efficiency of blue LED O/E conv. Efficiency of green LED O/E conv. Efficiency of red LED 0.40[A/W] 0.48[A/W] 0.52[A/W] O/E conv. Efficiency of 1chip LED0.53[A/W] TABLE 1. simulation parameters redgreenblue Efficiency (lm/W) type 1 Mixture ratio 10.892.51291 type 211.432.29317 type 312.621.96391 type 4111.177.19413 TABLE 2. The mixture ratio of three colors[1] Simulation Parameter

11. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 11 VLC-OFDM with 3-chip white LEDs for the frequency diversity gain. Fig. 2. BER performance of the 3-chip OFDM system for the increase of capacity compared with the 1-chip OFDM system in delay time 8ns Fig. 3. BER performance of the 3-chip OFDM system for the frequency diversity gain compared with the 1-chip OFDM system in delay time 8ns Simulation example of VLC-OFDM

12. doc.: IEEE 802.15-09-0654-00-0007 Submission September 2009 Kye San Lee.Jae Sang Cha,Yeong Min Jang et al.Slide 12 Conclusion Presented MIMO-VLC scheme is based on OFDM technique. MIMO-VLC technologies could achieve various Data Rate. Furthermore, proposed scheme also could be applied for various VLC applications with Scalable Data Rate.