It can also be chosen as next power of 2 of the length of the signal. The number of points – – in the DFT computation is taken as power of (2) for facilitating efficient computation with FFT. A value of is chosen here. In a power spectrum, power of each frequency component of the given signal is plotted against their respective frequency. Usually, power spectrum is desired for analysis in frequency domain. Representing the given signal in frequency domain is done via Fast Fourier Transform (FFT) which implements Discrete Fourier Transform (DFT) in an efficient manner. X=sin(2*pi*f*t+phase) %replace with cos if a cosine wave is desired NCyl = 5 %to generate five cycles of sine wave Phase = 1/3*pi %desired phase shift in radians If a phase shift is desired for the sine wave, specify it too. A oversampling factor of is chosen here – this is to plot a smooth continuous-like sine wave (If this is not the requirement, reduce the oversampling factor to desired level).

In order to generate/plot a smooth sine wave, the sampling rate must be far higher than the prescribed minimum required sampling rate which is at least twice the frequency – as per Nyquist Shannon Theorem. Matlab is a software that processes everything in digital.

Now that you have determined the frequency of the sinewave, the next step is to determine the sampling rate. For example, I intend to generate a f=10 Hz sine wave whose minimum and maximum amplitudes are and respectively. In order to generate a sine wave in Matlab, the first step is to fix the frequency of the sine wave.

Wireless communication systems in Matlab ISBN: 979-8648350779Īll books available in ebook (PDF) and Paperback formats.

Digital Modulations using Matlab : Build Simulation Models from Scratch, ISBN: 978-1521493885.

This article is part of the following books If you are inclined towards Python programming, visit here. I intend to show (in a series of articles) how these basic signals can be generated in Matlab and how to represent them in frequency domain using FFT. Often we are confronted with the need to generate simple, standard signals (sine, cosine, Gaussian pulse, squarewave, isolated rectangular pulse, exponential decay, chirp signal) for simulation purpose. Numerous texts are available to explain the basics of Discrete Fourier Transform and its very efficient implementation – Fast Fourier Transform (FFT). Plot one-sided, double-sided and normalized spectrum. Key focus: Learn how to plot FFT of sine wave and cosine wave using Matlab.

Fplot matlab