Question
The XCOV function in the Signal Processing Toolbox 6.8 (R2007b) has four distinct options: 'biased', 'unbiased', 'coeff', and 'none'. I would like to be able to create unbiased estimates of the cross-covariance function of my sequence with a normalized zero lag term.
Expert Answer
John Michell
PhD Expert
Answered Aug 24, 2026
The ability to create estimates of the cross-covariance function that are both unbiased and normalized is not available in the Signal Processing Toolbox.
To work around this issue, create unbiased estimates and normalize by the zero lag term manually, as in the following example:
ww = randn(1000,1); N = 10; [cov_ww,lags] = xcov(ww,N,'unbiased'); cov_ww = cov_ww / cov_ww(N+1); stem(lags,cov_ww)
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