Although the commonly used radio frequency band in today’s broadband infocommunication technology is getting overloaded, the demand is increasing in data rates and channel capacity. In order to be able to meet demand, we need to use the optical range of the electromagnetic spectrum instead of the microwave range.
In my thesis I am going to focus on VLC (Visible Light Communication), especially on its possible application in low data transmission (< 1 Mbps) as a new, wireless technology. I compare the possibilities of higher data rates and other frequency ranges. I summarize the recent researches and review the advantages and disadvantages of VLC technology. I present the most popular types of modulation for data transmitting.
After presenting VLC, I am going to talk about low data transmission. I describe the advantages and disadvantages, synchronous-asynchronous transmission, error detection and correction, and data framing.
In the final part of my thesis I present a transmitter and receiver software of a low data rate VLC link, using serial port for data transmission. I also created a graphical user interface to the software in MATLAB environment. After showing the full code I will give a step by step explanation the operation of the programme.
The existence of the link is verified by a predefined series of data, and bit error rates (BER) are also measured and analyzed by graphs.
At the end of my thesis I will summarize what I have mentioned so far and talk about the future possibilities and developments.