Question
I know that XCORR calculates linear cross-correlation function estimates, but I wonder if there is a function that calculates circular correlation.
Expert Answer
Kshitij Singh
PhD Expert
Answered Aug 23, 2026
If you have the Signal Processing Toolbox, you can use the CCONV function to calculate the circular cross-correlation of two sequences.
The following example from the documentation for CCONV (link below) calculates a circular cross-correlation of two sequences:
a = [1 2 2 1]+1i; b = [1 3 4 1]-2*1i; c = cconv(a,conj(fliplr(b)),7);
Note that this function was introduced in R2007a. For previous versions, you would need to implement a custom function in order to compute the circular cross-correlation.
If you do not have the Signal Processing Toolbox, you could also calculate the circular cross-correlation using the FFT function using the following syntax:
circcorr_ab = ifft(fft(a).*conj(fft(b)));
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