Friday 3 January 2014

6. Power Spectral Density


 6Power Spectral Density
AIM:
To verify Power Spectral Density
EQUIPMENTS:
Operating System – Windows XP
Constructor Simulator
Software - CCStudio 3 & MATLAB 7.5

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)');

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