Frequency domain delay and correlation

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Paolo Rossi
Paolo Rossi 2015-5-12
编辑： Paolo Rossi 2015-5-13
Hi, i have a signal S and i like to delay it in frequency domain. This is a little example of the code:
s = wgn(1,100,1); %White Gaussian Noise
sfft = fft(s)
sfft_shift = sfft.*exp(-i*2*pi*f*delay)
s_delay = ifft(sfft_shift)
i have some question:
1) delay should be express in second (continous) or in samples ? or it doesn't matter?
2) when i calculate the autocorrelation of the signal s the coefficient is 1. It is perfectly correlate. But when i calculate the crosscorrelation beetween s and s_delay with xcorr(s,s_delay,'coeff'), the coefficient is not 1 but it seems that the two signal s and s_delay are not completely correlate why?
Thanks Paolo

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