Hi,
When communication is carried out through visible light there are problems associated with it. The data transmission rates should be high enough so that flickering of the LED’s should not be detected. Sometimes it is possible for complete fadeout of the signals. To protect the data integrity the data should be framed, so as to detect lost signals and to ensure correct transmission and reception of the data. Computer network protocols like stop and wait algorithms are employed to solve this problem. The data can be of any form such as text, an audio, image or the video.For the communication to be full duplex it requires a downlink and an uplink. The downlink is implemented using the visible light. Whereas the uplink is provided using Infrared LED’s, as visible light would serve no purpose of illumination. Here e LED luminaires can be used
for high speed data transfer. The Visible Light Communication (VLC) can complement
the RF-based mobile communication systems in designing
high-capacity mobile data networks. Second, due to its high
frequency, visible light cannot penetrate through most objects
and walls. This characteristic allows one to create small cells of
LED transmitters with no inter-cell interference issues beyond
the walls and partitions. It can also increase the capacity of
available wireless channel dramatically. The inability of signals
to penetrate through the walls also provides an inherent wireless
communication security. Third, VLC facilitates the reuse of existing
lighting infrastructure for the purpose of communication.
Thanks,