Power Spectral Density matlab code

AIM:

To verify Power Spectral Density

EQUIPMENTS:

Operating System – Windows XP

Constructor - Simulator

Software - CCStudio 3 & MATLAB 7.5

THEORY:

The power spectral density(P.S.D) is a measurement of the energy at various frequencies.

PROGRAM:

%Power spectral density

t = 0:0.001:0.6;

x = sin(2*pi*50*t)+sin(2*pi*120*t);

y = x + 2*randn(size(t));

figure,plot(1000*t(1:50),y(1:50))

title('Signal Corrupted with Zero-Mean Random Noise')

xlabel('time (milliseconds)');

Y = fft(y,512);

%The power spectral density, a measurement of the energy at various frequencies, is:

Pyy = Y.* conj(Y) / 512;

f = 1000*(0:256)/512;

figure,plot(f,Pyy(1:257))

title('Frequency content of y');

xlabel('frequency (Hz)');

RESULT:

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