VLCGhulam Yasin

Let there beLIGHT !!

Let there beLIGHT !!

Existing or Being everywhere at the same time

Universal Connectivity

There is a large range of new opinion on these consideration.

New Idea for the Communication?

Security

Regulation

Eye safety

Health

Power consump-tion

Invisibility

Multimedia

Eavesdrop (regularity)

Frequency restriction

Low price

Human body safe

Eye safety regulation

Low power consumption

Mobility

Ease to use

Using it everywhere

High Speed Invisibility

Price

Convenience

Introduction

Lighting is a major source of electric energy consumption

It is estimated that 1/3 of global consumption of electricity is spent on lighting purposes Fluorescent lampas contain environnemental polluants

– The replacement of Light emitting diodes (LEDs) generating white light will reduce energy consumption It is fortune that White LED (WLEDs) are already

commercially available– Roughly 20 times and 5 times less power than

conventional light source and fluorescent bulbs

VLC ResearchesFirst research can be traced to as early as 1998-1999Contribution addressing broadband VLC using WLEDstarted appearing in 2001 Visible Light Communication Consortium (VLCC)

was established in November 2003– Members includes Toshiba, NEC, KDDI, Sony,

etcIEEE issued a Call for contributions on IEEE

802.15.7VLC in 2009 and held the first meeting

MotivationAbout 10 years ago, researchers came to the realization

that WLED devices could also be used for wireless communication purposes

– LEDs rends to be considerable cheaper than RF– Optical wireless allows easy bandwidth reuse and

improve security– It does not generate RF pollution– Replacing RF device will reduce interference in RFband– RF radiation in hospital, airplane, and mine will bevanished– Large amount energy can be saved

Why WLED?The weakness of conventional wireless

technologiesExpensive license band

Limited license-free band Interference Cost Power consumption Security

VLC (Visible Light Communication)New communication technology using “Visible Light”

Wavelength between ~400nm (750THz) and ~700nm (428THz)

General characteristic Visibility : Aesthetically pleasing

Security : What You See Is What You Send

Unregulated : No regulation in optical frequency

Health : Harmless for human body

Non-interference with other devices

visibleIR UV700nm 400nm100μm

RF3cm1m 1nm

428THz 750THz3THz10GHz300MHz 300PHz

1mm

300GHz

IrDA

TC 48802.15.3c

THzVLC802.11

802.16

VLC Introduction

Schematic Diagram based onWLED modulation

Application Scenario of VLC

Information

Broadcast

SAMSUNG

English

Chinese

Korean

USB dongleUSB dongle

Mobile to Mobile

Mobile to Multimedia

Keyless door entry

ID check E-payment

• Sign Board• E-book• Airplane• ITS(Intellig

ent Transport System)

• Museum• Product

Info.

Peripheral

Interface

Feasibility Test (PDA-PC/PC-PC visible link)

• Information Broadcasting system

Normal function as indication and illumination devices

Can be used as communication devices for transmitting & broadcasting digital information.

Message Board

E-book

Sign BoardITS (intelligent Transport System)

• Distance and Coverage of Transmission - might be improved as all of RGB LEDs could be modulated. Picture source: LED Magazine★

★

Information Broadcasting of VLC

LED application

Economicalefficiency

Back Lighting Mobile Phone

Home applications

digital device

TFT LCD TV

General Lighting

Communication

Display

General Lighting

Task Lighting

Signal Lamp

VLC Mobile to Mobile Infra to Mobile

Exterior, interior display

Sign & Architecture display

LED screen

LED Applications

Application Function

Mobile to

Mobile

Contents-sharing Data transfer

Mobile to

Fixed

File transfer Video streaming M-commerce

Infrastructure to

Mobile

Indoor Navigation Information-broad-

cast

Handheld device, Portable device

CE, Kiosk, Printer

VLC Application

VLC application

BandwidthSecurity

CoverageMobility

IRU

V

780nm

380nm

1nm

100μm

RF

3cm

1m

visi

ble

PeripheralInterface

LAN

Banking

Door Lock

In Plane

Digital Hospital

ITS (Navigation)

SAMSUNG

Sign Board

e-book

VisibleLAN

RFProhibited

InformationBroadcast

Security

E-display

Contents Machine

Optical receiver Receiver consists of

Optical filter Rejects ‘out-of-band’ ambient (background)

illumination (light)noise Lens system or concentrator

Collects and focuses radiation Photodetector (or array of detectors)

Converts optical power to photocurrent Incoherent (disjoint) detection

Preamplifier (or number of preamplifiers) Determines system noise performance

Post-amplifier and subsequent processing

Optical filter

Optical system

Photodetector

Amplifier

Output

Input radiation

Considering Factor

• Network Topology• Centralized network between AP and VL device.• Distributed network between VL devices

• To establish visible light link• Initial network entry• Channel access• Media access control

• Modulation• IM (Intensity Modulation)• Sub-carrier

• Resource management (RM) and QoS• Efficient resource allocation to different connections• Reuse of resources

• Power saving/power control

• Sleep/Idle modes for power saving• Indicate arrival of packets to nodes in power save mode• Buffer management for devices in power save mode• Power control for battery management and bandwidth management

• Mobility (micro mobility) • when the RX moving

Technical Fields to be discussed

Energy-Efficient CommunicationVLC technology has potential in a number of

specialized application areas, including Hospital and healthcareRisky environmentCommercial aviationCorporate and organizational securityWi-Fi spectrum reliefGreen ComputingDefence and military applicationsUnderwater communications