expected value formula in xcorr

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SYML2nd 2019-7-9

回答： Navya Seelam 2019-7-17

Hi all,

when I use the xcorr, the formula used in matlab is C(m) = E[A(n+m)*conj(B(n))] = E[A(n)*conj(B(n-m))] where E is the expected value.

I have seen that matlab does not have a function $expected value", so I was wandering which is the real formula behind xcorr.

Thank you in advance

Star Strider 2019-7-9

It appears to be the summation right below that, in the More About section.

Bjorn Gustavsson 2019-7-9

In my (oldish) version of matlab the xcorr function is a regular .m-file open for inspection. The heavy lifting is done by fft-ifft.

Navya Seelam 2019-7-17

Hi,

By default, “xcorr” computes raw correlations by summation with no normalization.

For more details on working of “xcorr” here:

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