Technical Solutions

Is there a function that calculates circular cross-correlation of sequences?

Date Last Modified: 20 Nov 2007

Solution ID:		1-16GLY
Product:		Signal Processing Toolbox
Reported in Release:		R2007b
Fixed in Release:
Platform:		All Platforms
Operating System:		All OS

Subject:

Is there a function that calculates circular cross-correlation of sequences?

Problem Description:

I know that XCORR calculates linear cross-correlation function estimates, but I wonder if there is a function that calculates circular correlation.

Solution:

The CCONV function in the Signal Processing Toolbox 6.8 (R2007b) can be used to calculate the circular cross-correlation of two sequences.

The following example calculates a modulo-4 circular cross-correlation of two sequences:
a = [2 1 2 1]; b = [1 2 3 4]; c = cconv(a,b,4)
For previous versions you would need to implement a custom function in order to compute the circular cross-correlation.

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