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Generating Amplitude-Modulated Signal
(Matlab Code, Simulink and Multisim)

E.M.Q. Panambo
E.D.G de Guzman
J.M.F. Heramis
College of Engineering – Electronics Engineering
Lyceum of Subic Bay, SBFZ
e.panambo@yahoo.com

Abstract – The receivers used to list Amplitude Modulation – Double Sideband Carrier (AM-DSBC) as the simplest receivers of any radio modulation technique; which may be why that version of amplitude modulation is still widely used today [1]. Amplitude modulation techniques are well established and understood when implemented with analog circuits and in Simulink. Since amplitude modulation is one of the earliest radios’ modulation techniques, this study illustrated the small part of its larger system. It examined and modeled the process of generating amplitude-modulate using MatLab – Simulink and Multisim program with a modulating frequency (message signal) of 2Hz and a carrier frequency of 50Hz having an ideal modulation of 100%. Also, this study compared three different results of an AM signal through Matlab Code Simulink, and Multisim system. The history of generating amplitude-modulated signal will also be tackled. Lastly, this study will evaluate the disadvantages and advantages of using amplitude modulation process.

Going through the study, the researcher applied corresponding method in each different system in order to obtain the aimed data and results. The message frequency signal and carrier frequency signal are in sine and cos waveform with different frequencies while the output signal was in amplitude-modulated form with modulation index of 1. In comparing three outcomes, the modulating frequency signal, carrier frequency signal and AM signal are closely similar with one another, wherein the researchers acquired the accurate data.

Amplitude modulation is considered one of the easiest methods in analog-to-digital conversion. And since AM technology is much simpler than frequency modulation (FM), it is still used in


References: Foden, S. (1999). Explanation of Amplitude Modulation. http://www.ehow.com/info_8793029_explanation-amplitude-modulation.html Tucker, D.G Mistry, Jaggers, Lodge,Alton, Mericle, Frush, & Meliones. (2008). Communication and Leadership. http://www.nwlink.com/~donclarck/leader/leadcom.html What is Amplitude Modulation Signal
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