1 / 21

Visible Light Communication

Visible Light Communication. By: Suhail More ME-E&TC Rollno-E1109. Under Guidance of: Prof C.V Kulkarni. Contents. Introduction Why VLC Technology Modulation VLC Consortium Applications Difficulties Conclusion and Outlook.

nira
Download Presentation

Visible Light Communication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Visible Light Communication By: Suhail More ME-E&TC Rollno-E1109 Under Guidance of: Prof C.V Kulkarni Visible Light Communication

  2. Contents • Introduction • Why VLC • Technology • Modulation • VLC Consortium • Applications • Difficulties • Conclusion and Outlook Visible Light Communication

  3. Introduction • New communication technology using Visible light. • Visible light is only a small portion of the electromagnetic spectrum. • Wavelength between 380nm(750 THz) to 750nm(428 THz). Visible Light Communication

  4. WHY VLC???? • It does not cause any health problems. • No EM-interference. • It is free. • Fast switching. • Ever-increasing market share of LEDs makes VLC ubiquitously available. Visible Light Communication

  5. Technology(1/3) • Transmitters • Theoretically every kind of light source can be used as transmitting device. • More promising alternatives are fluorescent lights and LEDs. • LEDs are the predominant choice for transmitters. Visible Light Communication

  6. Technology(2/3) • Receivers • Photodiode receivers. • CCD and CMOS sensors. Visible Light Communication

  7. Technology(3/3) Visible Light Communication

  8. Data rates achieved • Phosphorus LEDs can achieve up to 40 Mbps. • By using RGB LEDs data rates can go up to 100 Mbps. • RCLEDs (Resonant Cavity LEDs) can achieve data rates up to 500 Mbps. • RCLEDS use Bragg reflectors to enhance the emitted light. • Increased spectral purity when compared to conventional LEDs. Visible Light Communication

  9. Component Set Up Transmitter unit Receiver unit Visible Light Communication

  10. Modulation • Modulation is used to transform the data(given as a sequence of 0s and 1s) into a series of light pulses. • Two main alternative modulation schemes: • Pulse Position Modulation(PPM): - Amplitude & width of pulse is constant. • Frequency Shift Keying (FSK): - Digital information is transmitted through frequency changes of carrier wave. Visible Light Communication

  11. VL vs RF Comparison Visible Light Communication

  12. VLC Consortium • The Visible Light Communication Consortium was established in 2003 by Japanese tech-companies. • Four Committees: • Research & Planning • Technical • Standardization • Popularization • Two standards are proposed: • JEITA CP-1221 • JEITA CP-1222 • Standardization efforts for physical and media access layer are also done by IEEE 802.15, Task Group 7. Visible Light Communication

  13. Applications • Smart Home Network • Commercial Aviation • Hazardous Environments • Hospital and Healthcare • Defense and Military Applications • Underwater Communications • Indoor location estimation • Vehicle to vehicle communication Visible Light Communication

  14. VEHICLE COMMUNICATION • Many cars have LED lamps. Traffic signage, traffic lights, and street lamps are adopting the LED technology so there are massive applications opportunities here. Visible Light Communication

  15. HOSPITALS & HEALTHCARE • There are advantages for using VLC in hospitals and in healthcare.  Mobile phones and Wi-Fi's are undesirable in certain parts of hospitals, especially around MRI scanners and in operating theatres. Visible Light Communication

  16. SMART LIGHTING • Smart buildings require smart lighting. Smart lighting with VLC provides the infrastructure for illumination, control and communications and will greatly reduce wiring and energy consumption within a building. Visible Light Communication

  17. UNDERWATER COMMUNICATIONS • Radio waves do not propagate for a long distance under water. • It was demonstrated that the flashlight visible light transmitter was able to transmit signals for 7 meters distance. Visible Light Communication

  18. Difficulties • Line of sight. • Very high light intensity of other source can cause the sensor to misjudge the light from the original source. • Short range.(max 15 meters) Visible Light Communication

  19. Conclusion & Outlook • VLC is a promising technology even if it is still in a very early stage. • Transmission rates are high as compared to other technology. • Using arrays of LED’s more data transmission can be obtained. Visible Light Communication

  20. References • Komiyama, Kobayashi “Study of visible light communication using RGB LED lights” SICE annual conference 2011 • D. Langer and J. Vucic , “Optical Wireless Indoor Networks: Recent Implementation Efforts,” Proc. ECOC, Torino, Italy, Sept. 2010. • H.Sugiyama, S.Haruyama, M.Nakagawa. “Experimental investigation of modulation method for visible-light communications “2006. • T. Komine and M. Nakagawa, “Fundamental Analysis for Visible-Light Communication System using LED Lights,” IEEE Tranaction on Consumer Electronics, vol. 50, pp. 100–107, February 2004. • D. O’Brien et al.:” Visible Light Communications: recent progress and challenges”, 2008 IEEE. • Ramirez-Iniguez, R. ; Idrus, S. M. ; Sun, Z. (2008) “Optical Wireless Communications : IR for wireless connectivity” CRC Press,USA. • VLCC website ; http://www.vlcc.net Visible Light Communication

  21. THANK YOU Visible Light Communication

More Related