Performance Analysis of Visible Light Communication System for Free Space Optical Communication Link. (2016) - Shamsudheen, P.
Abstract: The fast growth in gadgets usage and application developments has prompted many researchers to look beyond Wi-Fi. The possibility of using visible light for short range communication is explored by many researchers [1]. An intuitive acronym Li-Fi is used by many in contemporary literature to describe this concept. Light reaches almost all over the place, so communication can be done through light easily. By utilizing visible light as a transmission means, Li-Fi provides wireless indoor communication. Since the switching speed of Light Emitting Diode is less than 1 μs, they can be turned on and off rapidly, so human eye cannot identify any flickering, thus the light source seems to be persistent. This imperceptible on-off action permits information transmission utilizing binary codes. Turning on LED is a binary'1', turning it off is a binary'0'. It is possible to get sequence of 1s and 0s by adjusting the LEDs flickering rate. A photo detector can be used to recover the original data. This method of wireless transmission of information using rapid pulses of light is cited as Visible Light Communication. Its ability to challenge conventional Wi-Fi has roused the interest in Li-Fi. A study to analyze the performance of visible light communication system in optical wireless communication has been made and achieved a data rate of 10 kbps over 40 cm distances.