Abstract
In the recent years Visible Light Communication (VLC) has gained great interest 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. The advantages of indoor VLC that is offering illumination and data transmission simultaneously using the existing infrastructure, White LED lamp used as source. The significant challenge is a right location of the source allowed users to receive fine illumination as well as high data rate. In this paper we proposed a numerous distribution patterns with different number of LEDs to increase the signal to noise ratio (SNR) and enhanced the uniformity of the illumination. The indoor VLC system is modeled using the proposed pattern and the theoretical analysis is presented. Firstly we compare the normal distribution of the luminous intensity of one locations LED located on the center of room ceiling with our four locations LEDs model. To eliminate spot lighting 8 lactation of LED lamps was proposed. Lastly our novel arrangement using 17 locations has been investigated. A proposed design provide normal distribution which enhance the lighting and communication in whole room. A mathematical model of illumination LEDs has been studied, as well as the basic parameters which are important for the development of the design.
Highlights
Wireless communication is dominated by RF (Radio Frequency) communication, since James Maxwell and Michael Faraday demonstrated that Electromagnetic wave travels in a straight line through space
Firstly the simulation of the one Light-emitting diodes (LEDs) light located in the center of the ceiling at coordinate of [2.5, 2.5, 3.0] are investigated as [5], a simulation resulted clearly that the light is concentrate on the center of the ceiling which cause low illumination as well as data rate at the corners of the room
The system has been improves by adding four sources of LEDs in different locations to enhance the illumination and power distribution located at the coordinate of (1.25, 1.25), (3.75, 1.25), (3.75, 1.25), and (3.75, 3.75), arrangement has been done according to room diameter of the room mentioned above, led source is located in each corner
Summary
Wireless communication is dominated by RF (Radio Frequency) communication, since James Maxwell and Michael Faraday demonstrated that Electromagnetic wave travels in a straight line through space. An alternative method of communication of wireless communication using visual light is visible light communication, it's used emitting light source and light sensor receiver for data transfer. The dominant device for transmitter is Light-emitting diodes (LEDs) and for receiver is photo diode. This method have several advantages such as safety of human health, faster switching time and greater design flexibility [4], used is without license, any existing light source such as room illuminations and displays could be used as transmitters, in other word it can be used at a place where radio waves cannot be used, for example hospitals or area around precision machine [5]. There has been significant progress in this area in the past decade but still there are some challenges, to locate the source on the ceiling in order to emit light to cover all the floor of the room is the main of this challenges [8]
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