M. Hamza Akhtar FYP Presentation File.pdf

Final Year Project Presentation

1. Final Year Project-I (FYP-I)
Presentation Topic
Data Transmission (Audio, Text, &
Image) Using Light Fidelity (Li-Fi)
Technology

2. Supervisor Name
Engr. Sir Zia Ur Rehman
Leader
Muhammad Hamza Akhtar
Co-Leader
Muhammad Musharraf
Group Members:
Name: Muhammad Hamza Akhtar I.D.: 2339-2018
Name: Muhammad Musharraf I.D.: 2132-2018
Name: Muhammad Awais I.D.: 1633-2018
Name: Zaeem Mehtab I.D.: 1452-2018
Name: MoizUr Rehman I.D.: 1451-2018

3. Li-Fiistransmissionofdatathroughilluminationbytakingthefiber
outoffiberopticsbysendingdatathroughaLEDlightbulbthatvaries
inintensityfasterthanthehumaneyecanfollow.
Li-Fiisfast&cheapopticalversionofWi-Fibasedonvisiblelight
communication(VLC).
Attheheartofthistechnologyisthehighbrightnesslight-emitting
diodes.
Theon-offactivityofLEDsenablesakindofdatatransmissionusing
binarycodes.SwitchingonanLEDisalogical‘1’;switchingitoffisa
logical‘0’.
Itallowswirelesscommunicationwithouttheuseofradiowaves,
whichcanbedangerousinplaceslikeoilplatforms,underwater&on
planesLi-Ficanbethoughtofasalight-basedWi-Fi.
Introduction of Light Fidelity (Li-Fi)

4. Mechanical Diagram of Light Fidelity (Li-Fi)

5. Block Diagram of Light Fidelity (Li-Fi)

6. ThemaincomponentsofLi-Fisystemareasfollows:
a)AhighbrightnesswhiteLEDwhichactsastransmissionsource.
b)Asiliconphotodiodewithgoodresponsetovisiblelightasthe
receivingelement.
LEDscanbeswitchedon&offtogeneratedigitalstringsofdifferent
combinationof1s&0s.Togenerateanewdatastream,datacanbe
encodedinthelightbyvaryingtheflickeringrateoftheLED.TheLi-Fi
systemconsistsof4primarysub-assemblies:
a)Bulb
b)RFPowerAmplifierCircuit(PA)
c)Optics
d)PrintedCircuitBoard(PCB)
e)Enclosure
Construction of Light Fidelity (Li-Fi)

7. LEDcanbeswitchedon&offfasterthanthehumaneyecandetectsince
theoperatingspeedofLEDsislessthan1μs,therebycausingthelight
sourcetoappeartobecontinuouslyon.Thisinvisibleon-offactivity
enablesdatatransmissionusingbinarycodes.SwitchingonanLEDis
binary‘1’,switchingitoffisbinary‘0’.Itispossibletoencodedatain
lightbyvaryingtherateatwhichLEDsflickeron&offtogivedifferent
stringsof1s&0s.Modulationissorapidthathumanscannotnoticeit.A
photodetectorthenreceivesthesignal&convertsitintooriginaldata.
Thismethodofusingrapidpulsesoflighttotransmitinformation
wirelesslyistechnicallyreferredtoasVisibleLightCommunication
(VLC).ThetermLi-Fihasbeeninspiredduetoitspotentialtocompete
withconventionalWi-Fi.TheVLCusesvisiblelightb/w400THz(780
nm)&800THz(375nm)astheopticalcarrierfordatatransmission&for
illumination.
Working of Light Fidelity (Li-Fi)

8. Dataratesofgreaterthan100Mbpscanbeachievedbyusinghigh
speedLEDswithadequatemultiplexing.Paralleldatatransmissionusing
arraysofLEDswhereeachLEDtransmitsaseparatestreamofdatacanbe
usedtoincreasetheVLCdatarate.Thoughthelightshavetobekeptonin
ordertotransmitdata,theycanbedimmedtothepointthattheyarenot
visibletohumansbutstillbecapableoftransmittingdata.
Working of Light Fidelity (Li-Fi)

9. TherearcvariousadvantagesofusingaLi-Fimachine:
Moresecurity&vulnerabletounauthorizedaccess.
Availabilityofdataisincreased.
Lesspowerisrequired.
ThespeedofLi-Fiisveryhigh,&wecanwatchthevideoswithout
buffering.
ThelightoftheLi-Fidoesn’trunthroughthepartition,therefore,itis
moreprotected&hackingisnotpossible.
Li-Fiutilizeslightwaveswhichareharmless.
Thedatatransferismoreprotected.
Advantages of Light Fidelity (Li-Fi)

10. TherearcvariousdisadvantagesofusingaLi-Fimachine:
Inradiowavespectrumthedatatransmissionsecurityisveryless.
Lotofdatacannotbetransferredsimultaneously.
Healthissues.
Bandwidthusageislimited.
ItrequiresLOS(lineofsight),aswellasthereceiver,wouldnotbea
moveininside.
Themainproblemishowthereceiverwillsendthedatabacktothe
transmittersection.
Itdoesn’tworkinthedimareas.
Disadvantages of Light Fidelity (Li-Fi)

11. Applications of Light Fidelity (Li-Fi)
TherearenumerousapplicationsofLi-Fitechnology:
TrafficManagement&RoadSafety
MedicalApplications
Aviation
CommunicationUnderwater
ElegantLighting
InteriorMap-ReadingSystemForBlindPeople
InDangerousEnvironmentsorInSensitiveRegions
Transportations
IndustrialAreas