الفهرس 
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Abstract
This thesis focuses on improving the communication system to download data in the dark light when indoor lighting is not needed. This thesis explains how visible light can be used to transmit data even when the light appears dark or OFF. This thesis investigates VLC minimum illumination to receive power, to enable users to receive data when the light is “OFF”. This thesis focuses on improving the system performance including signal to noise ratio, required power and bit error rate. VLC with different modulation schemes highlighting as the ON–OFF Keying, Pulse Position Modulation, LPulse Position Modulation and Inverse L-Pulse Position Modulation are investigated in the dark light for communication. A short part of Pulse Width Modulation is used for dimming illumination. The thesis examines the selected parameters and essential requirements of VLC dark light system which are power, bandwidth efficiency and the dimming factor of light sources. The dark light is allowed enough to keep up information paces of a few kbps. This looks good for the eventual fate of VLC for actualizing shrewd lighting systems. After that, VLC can be utilized for Indoor Positioning Systems (IPSs). Most of VLC IPSs work when LED lights are on, which cause energy less when indoor lighting system is not necessary in the daytime. The main fundamental challenge in VLC systems is which commonly require the light to be ON during communication. Then how to communicate when the lights appear “OFF”? This thesis is proposing a positioning system of receiver that use in dark light visible light communication based on Received Signal Strength (RSS) positioning algorithm and discussing the possibility to use VLC IPS in dark light environment. The technique of RSS-based positioning is used for indoor positioning because of its simplicity. In this work, presented our solution dependent on the RSS. This proposition can ensure the IPS function even when LED to be “OFF” and makes more energy, that can be actualized in VLC systems to spare energy and give precise illumination control.