Özet:

Visible Light Communication (VLC), which is based on the idea of using the light sources used for lighting in data transmission, is expected to be among the communication technologies of the future. However, for reliable communication, it is important to know and predict indoor VLC channels that are known to have a multipath structure. Therefore, in order to examine the possible channel characteristics, multiple transmitter rooms with different sizes are arranged in the study. Channel Impulse Responses and Channel Frequency Responses were calculated for different receiver locations taking into account mobile users. As a result of the study, it has been shown that multiple transmitters are a powerful factor that changes the characteristics of the channel and frequency selective channels are formed related to the distribution of the sources and the receiver location. In the same room, depending on the receiver location, there may be a completely different fluctuation in the frequency band and some serious fading is observed in some frequencies. This result has attracted attention especially as a problem with pending solution for mobile users. At the end of the study, it was shown by using simulations that using directed illumination or detector with narrow field of view may reduce the frequency selectivity of the channel.

Anahtar Kelimeler: