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VISIBLE LIGHT COMMUNICATION

Seminar
by

Manish Saini

on 11 February 2013

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Transcript of VISIBLE LIGHT COMMUNICATION

VISIBLE LIGHT
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
50% Light
Life span : More than 50,000 hrs Flourscent Light White Light
25% 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 [1] 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

[2] 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

[3] 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

[4] 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

[5] 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

[6] 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”

[7] 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
References
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