Copyright 2014 工業技術研究院

可見光通訊應用技術介紹

ITRIIndustrial Technology

Research Institute

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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

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Smart Lighting System based on LED VLC

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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

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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

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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 (fasterresponse) 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

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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

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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

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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

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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 )

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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 )

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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

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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

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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

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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

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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。

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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 lightcommunication”, 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 andQuantum 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 PhotonicsJournal, 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 lightcommunication”, 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 PhotonicsJournal, 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 wirelesscommunications 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 communicationsystems,” 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 ofreflection 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 ofwhite-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 mainelectricity network,” Electronics Letters, vol. 47, no. 15, pp. 867−868, July 2011.

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

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