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Morse code security system via visible light communication using MATLAB

Mohammad Faudzi, Nurazrina (2015) Morse code security system via visible light communication using MATLAB. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The wireless communication technology involves the transmission of information over a distance without the help of wires and the transmitted distances can be a few metres until hundred metres. Unfortunately, the major issue in wireless communication is the limited of radio frequency spectrum which cause the field of optical wireless communication has been rapidly developed during the recent years. The visible light communication (VLC) is an alternative solution to overcome the problem of wireless spectrum limitation. It was selected due to several characteristic such as large bandwidth than entire radio frequency. The VLC are also low power consumption, low cost and licence free operated. In this project the VLC system is used to send the numeric Morse code for the security system code. The project involves the development of the VLC transmitter unit and the receiver unit. The super bright white light emitting diodes (LEDs) are used to transmit the numeric Morse code using visible light as a transmitting medium. The receiver detected the dot, dash and space for the Morse code and represented by the three different LED colour. MATLAB coding has been implemented to translate the numeric Morse code as a security system and operates independently. Friendly MATLAB GUI has been developed by using MATLAB coding. The receiver unit translated the signal and been displayed at the GUI to ensure the system are working properly. The measurement of transmitter and receiver have been analysed between both circuits to see the performance of VLC system. Moreover, the analysis is done for various distance between transmitter and receiver to define the maximum operation distance. However, the maximum distance between the transmitter and receiver is limited to 12 cm. This VLC system can be an alternative technology that can be implemented in the existing security system.

Item Type: Thesis (Masters)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-5865 Telecommunication. Telegraph.
Depositing User: Normajihan Abd. Rahman
Date Deposited: 02 Mar 2016 02:11
Last Modified: 02 Mar 2016 02:11
URI: http://eprints.uthm.edu.my/id/eprint/7557
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