how to find power spectral density of signal using fft

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C PRASAD
C PRASAD el 25 de Ag. de 2022
Respondida: Chunru el 25 de Ag. de 2022
psd using fft

Respuestas (1)

Chunru
Chunru el 25 de Ag. de 2022
You can also try other methods such as he periodogram, modified periodogram, Welch.
rng default
Fs = 1000;
t = 0:1/Fs:1-1/Fs;
x = cos(2*pi*100*t) + randn(size(t));
N = length(x);
xdft = fft(x);
xdft = xdft(1:N/2+1);
psdx = (1/(Fs*N)) * abs(xdft).^2;
psdx(2:end-1) = 2*psdx(2:end-1);
freq = 0:Fs/length(x):Fs/2;
plot(freq,10*log10(psdx))
grid on
title('Periodogram Using FFT')
xlabel('Frequency (Hz)')
ylabel('Power/Frequency (dB/Hz)')

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