الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
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Abstract
In closing, a Li Fi link has been demonstrated by applying a high-power LED as a signal transmitter and a polycrystalline solar cell as a receiver. The polycrystalline cell was chosen because of its excellent power conversion efficiency. Such a receiver operates without an external bias and can concurrently communicate data and harvest power. The OOK modulation with Manchester coding was used to test the VLC link; the data rate of this modulation approach is suitable for the dual operation of the receiver circuit. The load resistor in the energy-harvesting circuit branch can have a significant impact on the VLC link’s data rates. At a data rate of 100kbps, the system was tested at various distances between transmitter and receiver, with the maximum distance reached being 1 m. the system allows for user mobility with a wide angle between the transmitter and receiver reaches 90˚. The signal strength on a solar cell is also affected by the angle of the LED’s incident ray on the solar cell; as the angle increases the signal strength decreases.