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Autocorrelation is the cross-correlation of a signal with itself.

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finding period with autocorrelation is not correct

I first pad the signal with zeros, and then apply the autocorrelation y_cor = [zeros(1,N), y, zeros(1,N)]; [autocor, lags] = xcorr(y_cor); figure; plot(lags, autocor) grid As can be seen in the figure …