Patent ID: 8576962

Claim:
A method of determining cross-polarization isolation, comprising: obtaining a modulated signal from a communication link, the modulated signal including a modulated co-polarized signal component and a modulated cross-polarized signal component; determining cross-polarization isolation using the modulated co-polarized signal component and the modulated cross-polarized signal component, wherein said determining the cross-polarization isolation comprises: cross correlating a vector of digital sample values obtained from the modulated co-polarized signal component with a vector of digital sample values obtained from the modulated cross-polarized signal component wherein results of the cross correlating comprise a cross-correlation vector; obtaining a ratio of a peak value from the cross-correlation vector to an average of values from the cross-correlation vector, the ratio representing a peak signal-to-noise ratio; determining a correlation gain from a number of digital sample values used to perform the cross correlating; and determining a difference between the correlation gain and the peak signal-to-noise ratio; and using the determined cross-polarization isolation to adjust an antenna.