Light Fidelity (Li-Fi)

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Name of Innovation: Light Fidelity (Li-Fi):

Name of Innovation: Light Fidelity (Li-Fi) Team/ Individual Name: Raunak Members of the Team: Raunak Name of College and City: Fr. C Rodrigues Institute of Technology , Vashi , Navi Mumbai Course of specialization: Computer Engineering Year/ Batch: 4 th year College ID: 101051 Name of the Professor involved in this project: Sandhya Pati

Choose the stage of Innovation you’ve submitted::

Choose the stage of Innovation you’ve submitted: The name of the innovation is Light Fidelity (Li-Fi) and it is just an idea as of now.

The Innovation:

The Innovation Chosen industry : Public Services Chosen technology: Analytics Objective : To partially replace the existing Wi-Fi system with Li-Fi technology so as to provide wider bandwidth and better speed for data transmission. Approach : Light Fidelity (Li-Fi) means transmission of data using visible light by sending data through a LED light bulb that varies in intensity faster than the human eye can follow. If the LED is on, the photo detector registers a binary one; otherwise it’s a binary zero. Maximum Points: 10

The Innovation:

The Innovation Description : In a Li-Fi system, a Li-Fi bulb consisting of many small LED bulbs is connected to the sender computer via USB port or COM port. The data to be sent to the receiver is first converted into byte format by the sender machine. This intermediate form of data is sent to the LED mounted on a PCB. The PCB components make the LEDs to flicker continuously according to the byte array received from the sender machine. On the receiver side, a photo detector is connected to the receiver computer. The photo detector receives the light rays sent by the LEDs and convert into a computer understandable binary format. The data in intermediate format is sent to the computer via USB port or COM port. The receiving computer then converts the data into the format which is same as the format of the original file sent by the sender. Thus, the file is exchanged.

The Innovation:

The Innovation The Li-Fi system consists of 4 primary sub-assemblies: Bulb RF power amplifier circuit (PA) Printed circuit board (PCB) Enclosure The PCB controls the electrical inputs and outputs of the lamp and houses the microcontroller used to manage different lamp functions. A RF (radio-frequency) signal is generated by the solid-state p ower amplifier and is guided into an electric field about the bulb. The high concentration of energy in the electric field vaporizes the contents of the bulb to a plasma state at the bulb’s center; this controlled plasma generates an intense source of light. All of these subassemblies are contained in an aluminum enclosure . At the heart of Li-Fi is the bulb sub-assembly where a sealed bulb is embedded in a dielectric material. The dielectric material serves two purposes; first as a waveguide for the RF energy transmitted by the PA and second as an electric field concentrator that focuses energy in the bulb. The energy from the electric field rapidly heats the material in the bulb to a plasma state that emits light of high intensity and full spectrum.

The Innovation:

The Innovation Block diagram of Li-Fi sub-assemblies Bulb sub-assembly

Compelling need for the innovation:

Compelling need for the innovation The existing Wi-Fi technology has many disadvantages. It uses radio waves for data transmission which has a limited bandwidth and is very expensive. The transmission efficiency is less and since the radio waves can propagate through walls , they can be intercepted by malicious users. Also, the radio waves are hazardous for health. On the other hand Li-Fi technology uses light for transmission whose frequency spectrum is 10000 times more than that of radio waves. Due the rapidly increasing number of internet users, there is a compelling need to increase the bandwidth of data transmission. It is more efficient as the LED lights used for communication are cheaper and consume less energy. Also, it is more secured as the light cannot propagate through the walls and hence cannot be intercepted and misused by hackers. Li-Fi can be used in hospitals , airlines and power plans where generally use of radio waves for communication is prohibited because light rays are not at all hazardous. Li-Fi can be used in auto piloted cars that can communicate using their headlights. The LED lights can alert the driver when other vehicles are too close to the driver’s vehicle. Apart from these, there are numerous other advantages of Li-Fi. Maximum Points: 20


Impact The possibilities are numerous and can be explored further. If this technology can be put into practical use, every bulb can be used something like a Wi-Fi hotspot to transmit data using wireless medium and we will proceed toward the cleaner, greener, safer and brighter future. The concept of Li-Fi is currently attracting a great deal of interest, because it may offer a genuine and very efficient alternative to radio-based wireless. As a growing number of people and their many devices access wireless internet, the airwaves are becoming increasingly clogged, making it more and more difficult to get a reliable, high-speed signal. Li-Fi may solve issues such as the shortage of radio-frequency bandwidth and also allow internet where traditional radio based wireless isn’t allowed such as aircraft or hospitals. If Li-Fi is implemented on a massive scale, then the common man will be able to afford the cost of accessing internet. Maximum Points: 30


Implementation Maximum Points: 50 Month 1 Month 2 Month 3 Month 4 Month 5 Month 6 Month 7 Requirements collection And analysis Design & manufacture PCB for sender and receiver Make software to convert file into byte format Make software to convert byte array into original format Create device driver and GUI Implementation & testing


Implementation Li-Fi Bulb


Implementation Li-Fi system connecting devices in a room


Implementation Block diagram of Li-Fi system

The Competitive Advantage:

The Competitive Advantage Maximum Points: 30 Comparison of technologies used for connecting to the end user

The Competitive Advantage:

The Competitive Advantage Sources of guidance : 1. Jyoti Rani , Prerna Chauhan , Ritika Tripathi , “Li-Fi (Light Fidelity)-The future technology In Wireless communication”, International Journal of Applied Engineering Research, ISSN 0973-4562 Vol.7 No.11 (2012).   2. Richard Gilliard , Luxim Corporation, “The lifi ® lamp high efficiency high brightness light emitting plasma with long life and excellent color quality”.   3. Richard P. Gilliard , Marc DeVincentis , Abdeslam Hafidi , Daniel O’Hare, and Gregg Hollingsworth, “Operation of the LiFi Light Emitting Plasma in Resonant Cavity”. No, I am not pursuing a patent for this innovation.

Thank You:

Thank You

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