  We give a full analysis of the auto- and cross-correlations between the
Stokes parameters of the cosmic microwave background. In particular, we derive
the windowing function for an antenna with Gaussian response in polarization
experiment, and construct correlation function estimators corrected for
instrumental noise. They are applied to calculate the signal to noise ratios
for future anisotropy and polarization measurements. While the
small-angular-scale anisotropy-polarization correlation would be likely
detected by the MAP satellite, the detection of electric and magnetic
polarization would require higher experimental sensitivity. For
large-angular-scale measurements such as the being planned SPOrt/ISS, the
expected signal to noise ratio for polarization is greater than one only for
reionized models with high reionization redshifts, and the ratio is less for
anisotropy-polarization correlation. Correlation and covariance matrices for
likelihood analyses of ground-based and satellite data are also given.
