Using a Smartphone Transmitter for the Visible Light Communication System to Provide Secured Light Fidelity

This paper presents an approach to utilizing smartphone transmitters in Visible Light Communication (VLC) systems to achieve secured light fidelity, often referred to as "Li-Fi." by harnessing the capabilities of modern smartphones. A cost-effective and innovative solution is explored for secure short-range wireless communication. In the transmitting side the smartphone transmitter transmits data by using the screen or LED flash as a light source. Short-distance data transmission can be done quickly and securely by varying the intensity of the light emitted. This method is economical since it makes use of the hardware already present in smartphones. On the other hand, in the receiver side a photodiode or LDR sensor module that can recognize transmitted visible light signals makes up the receiver. We take into consideration a symbol rate range of 6 kHz to 10 kHz, which is an appropriate transmission rate for receivers that make use of the rolling shutter effect. The experimental setup was proven successful and the distance between the transmitter and receiver is 80 cm to realize a successful transmission line of sight is permanently desired and the transmission distance between them can be increased to 1.5 meters. Based on experimental results and basic factors in our wireless optical communication such as the distance between both transmitter and receiver and used modulation technique are simulated in MATLAB software depending on the BER of the communication medium.