Figure 5 the main component of li fi system leds

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Figure 5: The main component of Li-Fi system: LEDs, Photodiode and Image sensor.
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Seminar Li-Fi Technology 11 The LED bulb will hold a micro-chip that will do the job of processing the data. The light intensity can be manipulated to send data by tiny changes in amplitude. Figure 6 shows the working principle of Li-Fi system, for data transmission; it can be done by single LED or multi LED. On the receiver side there is a photo detector, which convert this light into electric signals and it will give the electric signals to the device connected to it. Voltage regulator and level shifter circuits are used on both sides to convert or maintain a voltage level between transmitter and receiver. [ 12 ] Figure 6: The working principle of the Li-Fi. 2-5 Advantages Li-Fi is ideal for high density wireless data coverage in confined area and for reducing radio interference issues. Its features include benefits to the capacity, energy efficiency, safety and security of a wireless system; now, we will talk briefly about each one of these advantages. [ 4 ] [ 12 ] I. Efficiency The efficiency of each radio station is just 5%due to the fact that most of the energy is used for the cooling system in base of the radio station. Li-Fi is highly efficient because LED consumes less energy. [16] It is effective in terms of low cost, low required energy and for various Environments. In this topic there are some main and important points: Low cost: Requires fewer components than radio technology, due to the cheap price of the LEDs and Digital components compared with the microwave equipment. Energy: LED illumination is already efficient and the data transmission does not requires, additional power because most energy dissipation in LEDs requires little amount of energy. Environment: RF transmission and propagation in water is extremely difficult but Li-Fi works well in this environment. [ 15 ] II. Capacity Any lighting devices like car lights, ceiling lights, street lamps, etc. are used as a hotspot. It means that any light spread internet using VLC which helps us to lower cost architecture for a hotspot. [ 12 ] The most important issues here are Bandwidth, Data density and speed.
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Seminar Li-Fi Technology 12 Bandwidth: The visible light spectrum more abundant 10,000 times compared with the RF spectrum.. Data density: Li-Fi can achieve about 1000 times the data density of Wi-Fi because visible light can be well contained in a tight illumination area, whereas RF tends to spread out and cause interference. High speed, Very high data rates can be achieved as high as 500mbps or 30GB per minute due to the low interference, high device bandwidths and high intensity optical output. [ 4 ] III. Safety Light is all around us it is a natural part of life and as such there are no health concerns associated with its use as a communications medium. It never gives any side effects on any living thing like radio waves and other communication waves which can dangerously interfere with electronic circuits and have effects on birds and humans. [ 10 ] IV. Security “If you can’t see the light, you can’t access the data!”
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