  Visible Light Communication (VLC) has gained great interest in the last
decade due to the rapid developments in Light Emitting Diodes (LEDs)
fabrication. Efficiency, durability and long life span of LEDs make them a
promising residential lighting equipment as well as an alternative cheap and
fast data transfer equipment. Appliance of visual light in data communication
by means of LEDs has been densely searched in academia. In this paper, we
explore the fundamentals and challenges of indoor VLC systems. Basics of
optical transmission such as transmitter, receiver, and links are investigated.
Moreover, characteristics of channel models in indoor VLC systems are
identified and theoretical details about channel modelling are presented in
detail.

Networking and Internet Architecture