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VISIBLE LIGHT COMMUNICATION
Transcript of VISIBLE LIGHT COMMUNICATION
COMMUNICATION 600 TB/month EFFICIENCY ELECTROMAGNETIC SPECTRUM VLC Standards Applications WHITE LIGHT LEDs 1.4 million 5 billion CAPACITY SECURITY AVAILABILITY GENERAL LIGHTING SOLUTION Incandescent Bulb First Industrial Light Source
5% light, 95% heat
Life span : Few thousand hours Solid State LED Compact
Life span : More than 50,000 hrs Flourscent Light White Light
Life span : 10,000 hrs OLED New technology, expensive and short life time. However very potential. Blue Chip + Phosphor Popular for general lighting,
efficient and cheap RGB Well known technology, limited use, problem with balancing R G B component to create white light JEITA CP-1221 JAPAN ELECTRONICS AND INFORMATION TECHNOLOGY INDUSTRY ASSOCIATION Restricts the wavelength of all emitted light to be within a range of 380nm-750nm.
Suggests using Sub Carrier - Pulse Modulation
Defines three major frequency ranges :
15 KHz - 40 KHz
40 KHz - 1 MHz
>1 MHz JEITA CP-1222 JAPAN ELECTRONICS AND INFORMATION TECHNOLOGY INDUSTRY ASSOCIATION Supposed to be used only for communication purposes
Restricts the sub-carrier frequency to 28.8 KHz
Suggests using Sub Carrier -4 PPM as modulation scheme IEEE 802.15 TG7 The IEEE has formed a Task Group 7 which is supposed to write a PHY and MAC standard for VLC
Physical Layer (PHY) defines the electrical and physical specifications for devices
Media Access Control (MAC) data communication protocol sub-layer provides addressing and channel access control mechanisms Under water Communication Systems Radio waves do not propagate under water for a long distance. Instead, we use flash light visible light which can be transmitted upto better depth. Inside Airplane Communication Vehicle to vehicle messaging Thank You
Q n A Presented by:
Manish Saini  Christian Pohlmann, “Visible Light Communication”, http://www-old.itm.uni-luebeck.de/teaching/ss10/sem_kim/ausarbeitungen/2010-06-29%20Pohlmann.%20Visible%20Light%20Communication.pdf?lang=de
 H. Elgala, R. Mesleh, H. Haas and B. Pricope, “OFDM Visible Light Wireless Communication Based on White LEDs”, http://www.cwc.jacobs-university.de/pdf/emhp0701.pdf
 OFDM Mostafa Z. Afgani, Harald Haas, Hany Elgala, and Dietmar Knipp, “Visible Light Communication Using OFDM,” http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.83.3923&rep=rep1&type=pdf
 Grantham Pang, Thomas Kwan, Hugh Liu, Chi-Ho Chan, “Optical Wireless based on High Brightness Visible LEDs”, www.eee.hku.hk/~gpang/IARL/Publication/LEDs.pdf
 Harald Haas, “Wireless data from every light bulb | Video on TED.com,” http://www.ted.com/talks/harald_haas_wireless_data_from_every_light_bulb.html
 Hoa Le Minh and Zabih Ghassemlooy, Optical Communications Research Group (OCRG) School of Computing, Engineering and Information Sciences Northumbria University, United Kingdom “Visible Light Communications”
 IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs), http://www.ieee802.org/802_tutorials/2008-03/15-08-0114-02-0000-VLC_Tutorial_MCO_Samsung-VLCC-Oxford_2008-03-17.pdf