Visible Light Communication: Concept, Technology, Challenges and Possibilities

99 Pages·2013·4.9 MB·English

by  Engel, Lisa Lisa.

Visible Light Communication:
Concept, Technology,
Challenges and Possibilities
Navin Kumar (PhD)
MIEEE, IET(UK), IAEG(HK), IE, IETE(India)
CMR Institute of Technology, Bangalore -India

Jiao Tong University
1 3/25/2013 Shanghai
Agenda

Introduction

Optical Wireless

Infrared

Free Space Optics

Basic Components and Configuration
Visible Light Communication
Motivation
LED Advancement
2
3/25/2013
Agenda …
Characteristics

Applications
Technical Details
Architecture and VLC System
Modelling Development
Prototype, Testing & Results
Progress & Current Status
Conclusion
3
3/25/2013
Introduction
Visible Light Communication ?
Communication using visible light
Wirelessly.
Tx 0 0 1 0 0
1 0
1 1 0 1 0 1 0 0 1 0
1
1 1 0 0 1 0
1
1
1 1
0 Rx
1
0
4 3/25/2013
Introduction: History
Smoke signals of the ancient tribes
The use of fire or lamp
Beacon fire, lighthouse, ship-to-ship comm.
Information delivery using mirror reflection (Heliograph): is

a wireless solar telegraph that signals using Morse code
flashes of sunlight reflected by a mirror.
Traffic light : R/G/B color multiplexing (Walk/Stop)
5 3/25/2013 Traffic Signal
Introduction: History …
A le xander Grahm Bell’s Photophone
(1880)
Optical source: sunlight
Modulation: vibrating mirror
Receiver: parabolic mirror
Distance: 700 ft (213m)
In 1920, somewhat by accident,
Losev foresaw the usage of
optical links to relay
information.
 In 1969, Gfeller presented
Source:
“Wireless In-House Data
http://www.freespaceoptic.com/
Communication via Diffuse
Infrared Radiation”. It became
the stepping stone to VLC.
6 3/25/2013
Facts, Figures, and Trends of
Wireless Networks and Technology
Several Technologies move in the same direction
5G
4G
Many
Access
Networks
7 3/25/2013
Introduction

8 3/25/2013
Introduction
Wireless data transmission via optical
carriers: opportunity, many yet
unexplored.
Optical Wireless Communication (OWC):
Significant technical and operational
advantages.
OWC, in some applications:
–a powerful alternative to radio frequency
(RF) and,
–complementary to existing RF wireless
9 3/25/2013
systems.
Frequency Spectrum

Licensing Area/ISM
Special purposed Area
Increasing Frequency(ν)
24 22 20 18 16 14 12 10 8 6 4 2 0
10 10 10 10 10 10 10 10 10 10 10 10 10 ν(Hz)
High Frequency
Micro
Low Fγrerqauyesncy
X rays UV IR FM AM Longwav(eSmall wavelength)
(High wavelength) wave High Bandwidth
Radiowave
Large Coverage Security
Mobility
-16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8
10 10 10 10 10 10 10 10 10 10 10 10 10
Increasing Wavelength(λ) λ(m)
Visible Spectrum
IrDA : 334THz(900nm) to
Non-Licensing Area
353THz (850nm)
10 3/25/2013
380nm 780nm