(http://www.itri.org.tw/chi/tech-transfer/04.asp?RootNodeId=040&NodeId=041&id=4662) 本技術開發之白光Phosphor-LED可見光通訊(VLC)系統，除了具提供照明之外，還可同時提供通訊傳輸應用。此LED VLC傳輸系統可達到40Mb/s的下傳光傳輸容量，且同時具20Mb/s的下傳光傳輸容量。此外LED光傳輸距離最高可達到5m遠，極具多項通訊應用情境，如: 室內、機場、機艙、醫院、賣場、個人室內GPS定位應用等等…。

1. Copyright 2014 工業技術研究院
可見光通訊應用技術介紹
ITRI
Industrial Technology
Research Institute

2. 2
Visible Light Communication (VLC)
 What is VLC ?
 Wavelength 400 nm~700nm
(750 THz ~ 428 THz )
 Illumination / Display / Traffic
Signal / Communication,
suitable for small area requiring
high transmission rate

3. 3
Smart Lighting System based on LED VLC

4. 4
http://technologies.cttc.es/m2m/technology-transfer/visions/
http://jonatasmattes.blogspot.tw/2013/06/lifi-alternative-to-wifi.html
LED可見光照明 / 通訊 / 定位技術
 具綠色節能效益
 具可見光照明/通訊
 精準室內定位
 無電磁波干擾
 具網路安全
 License-Free
You Are
Here
LED 燈具
可見光通訊/定位

5. 5
醫療通訊應用 畫展應用
展場應用辦公室應用 家庭應用
店家應用 戶外接收資訊應用
戶外車載通訊應用飛機照明通訊
LED通訊/定位系統應用情境
潛水通訊應用

6. 6
White-Light LED Types
 Why Use White-Light LED?
White-light LED is predicted to become a key component for
future indoor illumination due to its high-efficiency, low-cost,
long lifetime, and more modulation bandwidth (faster
response) than fluorescent lights.
• Blue LED + Yellow Phosphor
 Cheaper
 Slow Response of the Yellow
Phosphor
• RGB LED
 Costly
 With Potential for WDM
~ 1 MHz BW ~ 10 MHz BW

7. 7
 Sources: Limited bandwidth (phosphor-LED)
 Channel Effects: not a issue (when data rate <
100Mbit/s)
 Receivers: not a issue (depends on cost)
 Providing Uplink: by using infrared, RF, or retro-
reflecting transceiver
 Standardization: eye-safety , harmless to epileptics,
compatibility of other wireless techniques
Technical Issues & Challenges

8. 8
 Improve the signal response by using
transmitter/receiver (pre/post) equalization
 Use more bandwidth-efficient modulation schemes
 Parallel transmission
 Optical MIMO
Solutions for Increasing Data-Rate

9. 9
國際上LED VLC發展技術 ( I )
Bytelight LED Positioning  Product Demo (定位應用) (2012)
DEMO影片-美國Bytelight
You are here
Bytelight (USA)
整合LED照明/通訊技術，並
結合Smart Pad，以達到個人
化定位與商品導覽應用
https://www.youtube.com/watch?v=ej2Hi-m1MBI

10. 10
Emart Sale Navigation  Lighting Coupon (大型超市) (2103)
DEMO影片-韓國Emart Emart : ETRI + Samsung
結合推車與個人手機於賣場內，再整
合LED室內定位/通訊技術，以達到
個人化定位與商品導覽應用
https://www.youtube.com/watch?v=Qch3kNUF0fE
國際上LED VLC發展技術 ( II )

11. 11
Philips (2104)
Philips Launches LED Lighting for Indoor Navigation in Store & Supermarket
http://www.gim-international.com/news/positioning/gps/id7900-
philips_launches_led_lighting_for_indoor_navigation.html
EuroShop 2014 in Germany
Smart Phone
國際上LED VLC發展技術 ( III )

12. 12
ITRI/ICL : Real-Time LED VCL系統
Rx
IR LED
Rx
LED
LED照明端模組
(一般白光LED)
接收端模組
(紅外光IR-LED)
可見光通訊：頭端模組
可見光通訊：用戶端模組
傳輸速率
下傳40 Mbps / 上傳20 Mbps

13. 13
ITRI/ICL : LED Indoor Positioning System
Jerry is here
ID-1 ID-2 ID-3 ID-4 ID-5
Network &
Information
Management
Indoor Positioning System
LED Lighting/Positioning Module
Client Side
(Smart Pad)
You are here
 每個 LED 可皆為不同的 ID 以作為區隔
 結合 ITRI 開發之 Dongle 與 Smart Pad，可即時知道個人於室
內的所在位置
Jerry
Management Central

14. 14
2014 : 智慧城市展
真茂科技行動醫療推車
Client模組
LED照明通訊
Server管理
4G應用服務探索館 : VLC醫療推車應用

15. 15
2014 : 智慧城市展
4G應用服務探索館 : 室內定位應用
You are
here
展場 LED VLC 定位圖資
定位LED光源
接收端模組/
Smart Pad
Dongle

16. 16
ITRI/ICL : 國內外報章雜誌報導
 「工研院4G服務館，秀情境體驗」，中央通訊社/聯合新聞網/大紀元，2014年2月19日。
 「智慧城市展，手機室內導航成趨勢」，自由時報電子報，2014年2月19日。
 「4G即將上路，情境體驗生活」，公共新聞網，2014年2月19日。
 「光通訊Li-Fi揭新世代」，非凡新聞台(新聞特攻隊)專訪報導，2013年11月23日。
 「突破調變/濾波技術瓶頸：LED可見光通訊應用成真」，新電子科技雜誌，2013年1月刊。
(Invited Paper)
 “Digital Signal Processing for the Light Emitting Diode Based Visible Light Communication”,
IEEE Photonics Society Newsletter, vol. 26, no. 5, pp. 9−13, October 2012. (Invited Paper)
 「LED可見光通訊的時代到了」，CTimes雜誌，vol. 252，pp. 108−111，2012年10月刊。
(Invited Paper)
 「聯網/多螢串流皆宜：LED可見光通訊技術成真」，新電子科技eNews，October 26，2012。
 「寬頻通訊系統主題館−展現光纖新應用」，TechUp科技網，October 12，2012。
 「LED可見光通訊的時代到了！照明、通訊一手包辦」，CTimes eNews，September 14，
2012。

17. 17
ITRI/ICL : VLC前瞻技術成果
1. C. H. Yeh, C. W. Chow, et.al., “Adaptive 84.44–190 Mbit/s phosphor-LED wireless communication utilizing no blue filter at practical
transmission distance”, Optics Express, vol. 22, no. 8, pp. 9783–9788, April 2014.
2. J. Y. Sung, C. W. Chow, and C. H. Yeh, “Dimming-discrete-multi-tone (DMT) for simultaneous color control and high speed visible light
communication”, Optics Express, vol. 22, no. 7, pp. 7538–7543, April 2014.
3. C. H. Yeh, Y. L. Liu, et. al, “Real-time white-light phosphor-LED visible light communication (VLC) with compact size”, Optics Express, vol.
21, no. 22, pp. 26192–26197, November 2013.
4. Y. F. Liu, C. H. Yeh, et. al., “AC-based phosphor LED visible light communication by utilizing novel signal modulation”, Optical and
Quantum Electronics, vol. 45, no. 10, pp. 1057−1061, October 2013.
5. Y. F. Liu, C. H. Yeh, et. al., “Alternating-signal-biased system design and demonstration for visible light communication”, IEEE Photonics
Journal, vol. 5, no. 4, p. 7901806, August 2013.
6. C. H. Yeh, C. W. Chow, et. al., “Simple digital FIR equalizer design for improving the phosphor LED modulation bandwidth in visible light
communication”, Optical and Quantum Electronics, vol. 45, no. 8, pp. 901−905, August 2013.
7. C. W. Chow, C. H. Yeh, et. al., “Background optical noises circumvention in LED optical wireless systems using OFDM,” IEEE Photonics
Journal, vol. 5, no. 2, p. 7900709, April 2013.
8. C. W. Chow, C. H. Yeh, et. al., “Adaptive scheme for maintaining the performance of the in-home white-LED visible light wireless
communications using OFDM,” Optics Communications, vol. 292, pp. 49−52, April 2013.
9. C. W. Chow, C. H. Yeh, et. al., “Mitigation of optical background noise in light-emitting diode (LED) optical wireless communication
systems,” IEEE Photonics Journal, vol. 5, no. 1, p. 7900307, February 2013.
10. Y. F. Liu, C. H. Yeh, et. al., “Demonstration of bi-directional LED visible light communication using TDD traffic with mitigation of
reflection interference,” Optics Express, vol. 20, no. 21, pp. 23019−23024, October 2012.
11. C. H. Yeh, Y. F. Liu, et. al., “Investigation of 4-ASK modulation with digital filtering to increase 20 times of direct modulation speed of
white-light LED visible light communication system,” Optics Express, vol. 20, no. 15, pp. 16218−16223, July 2012.
12. C. W. Chow, C. H. Yeh, et. al., “Improved modulation speed of the LED visible light communication system integrated to the main
electricity network,” Electronics Letters, vol. 47, no. 15, pp. 867−868, July 2011.

18.  可移轉技術公告網址：http://www.itri.org.tw/ (首頁→公告→研發成果公告)
 ttp://www.itri.org.tw/chi/tech-transfer/04.asp?RootNodeId=040&NodeId=041&id=4662
可移轉技術項目