LiFi Share Ppt

8/18/2019 LiFi Share Ppt

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$echnolog' ehind LiFi*+R,

It has its uni-ueness on ma!ing use of hard wares that are alread'present in the mobile&

*ardware level mobile app accessing the L,. diode and Flash

L,.&

ince light is used as transmitting medium& .ata transmissionrate is ver' high&

*uge /les can be transferred in ver' short time interval&

Can be improved b' multi colored L,.s and multifunctionalambient light sensor&


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WOR0I12 OF LiFi *+R,


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$ransmitter

L,.s are good source of LiFibecause of their high response rate&

L,.s can response ver' rapidl' tochange in input&

when a bit 3ero is to be passed theL,. is OFF and when 4 is to be passedL,. is on&

$he data or /le to be transmitted is/rst converted into binaries ( 5 and 4 )

$he binaries thus formed is used forswitching the L,. O1 and OFFrespectivel'&


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.i6erent wa's of 7odulating ignals

ON/OFF Keying.Flic!ering of light at a ver' fast rate to form 5s and 4s

Variable Pulse Modulation.7odulating the amplitude of the light so as to increase the densit'of data transmission&

Color Shift keying.When multiple number of colors are used need of amplitude

variation becomes rare&


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7ulti Color or Color hift0e'ing

$his method is for increasing the amount of data transmission& It favors data sharing even through light re8ections from walls&


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R,C,I%,R

,ver' phone has a pro#imit' sensorintegrated with a +mbient light sensor&

In practical +mbient light sensors are

used for rightness control&

since the ambient light sensor used inmobile phone is a photo diode it can beused in our application&

$he +mbient light sensor here is usedfor sensing the 8ic!ering of L,. so as toreceive the inar' bits&


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W*9 :*O$O .IO., ;

:hoto diodes have a response time of < ns which is ver' muchenough for sensing the 8ic!ering of L,. so fast& $he accurac' of the L,. is convinced with the help of+lgorithm developed in app&


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7obile +pp

• $he +mbient lightsensor " thus acting asthe receiver will receivethe binaries at a rate of


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*+RI12 :ROC,•

the app shows the authentication details forconnecting with the receiver mobile&

• Once the authentication process is over receiver hasto clic! receive button for receiving the data from thetransmitter via LIFI&

• Once pairing is done and the encoded /le now has tobe transmitted through LiFi and the receiver receivesit&


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LI7I$+$IO1 = *OW W, O%,RCO7, $*+$

• .ata transfer during da' time or during thepresence of light ma' a6ect the transmission& – $his can be over come b' either using

multifunctional +mbient Light ensor or theenvironment lighting is considered as 3ero atprogram level&


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F>$>R, CO:,

• While LiFi ma' not completel' replace WiFi" thetechnologies could be used in parallel to createmore e?cient networ!s& $he success of the pilotpro@ects could see LiFi technolog' rolled out for

consumers within the ne#t three to four 'ears&• that in the future ever' L,. light bulb could be

used as an ultrafast alternative to WiFi&

• +ll we need to do is /t a small microchip to ever'

potential illumination device and this would thencombine two basic Functionalities the' areillumination and wireless data transmission

LiFi Share Ppt

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