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US 8,576,962 B1Granted
Determining cross-polarization isolation using a modulated carrier
AssigneeGlowlink Communications Technology, Inc.
InventorsMichael L. Downey, Jeffrey C. Chu
Life of this patent
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Abstract
A method of and system for determining cross-polarization isolation is described. In one embodiment, a modulated signal is obtained from a communication link. The modulated signal includes a modulated co-polarized signal component and a modulated cross-polarized signal component. Cross-polarization isolation is determined using the modulated co-polarized signal component and the modulated cross-polarized signal component. The determined cross-polarization isolation can be used to adjust an antenna.
Claims41
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.
6 more elements
A method of determining cross-polarization isolation, comprising:
- obtaining a signal from a communication link, the signal including a co-polarized signal component and a cross-polarized signal component;
- cross correlating a vector of digital sample values obtained from the co-polarized signal component with a vector of digital sample values obtained from the cross-polarized signal component wherein the results of the cross correlating comprise a cross-correlation vector;
- determining cross-polarization isolation using results of the cross correlating to obtain a peak signal-to-noise ratio, wherein the peak signal-to-noise ratio is determined by identifying a peak value from the cross-correlation vector, determining an average of values from the cross-correlation vector and obtaining a ratio of the peak value to the average;
- and
- using the determined cross-polarization isolation to adjust an antenna.
2 more elements
A method of determining cross-polarization isolation, comprising:
- obtaining a signal from a communication link, the signal including a co-polarized signal component and a cross-polarized signal component;
- cross correlating a vector of digital sample values obtained from the co-polarized signal component with a vector of digital sample values obtained from the cross-polarized signal component;
- determining a first cross-polarization isolation using results of the cross correlating;
- determining a power spectral density for each of the co-polarized signal component and the cross-polarized signal component;
- determining a second cross-polarization isolation from a difference between the power spectral density of the co-polarized signal component and the power spectral density of the cross-polarized signal component;
- and
- using a maximum of the first cross-polarization isolation and the second cross-polarization isolation to adjust an antenna.
4 more elements
A system for determining cross-polarization isolation, comprising:
- means for obtaining a signal from a communication link, the signal including a co-polarized signal component and a cross-polarized signal component;
- means for processing the co-polarized signal component to obtain a vector of digital sample values for the co-polarized signal component;
- means for processing the cross-polarized signal component to obtain a vector of digital sample values for the cross-polarized signal component;
- means for cross correlating the vector for the co-polarized signal component with the vector for the cross-polarized signal component and using results of the cross correlating to obtain a peak signal-to-noise ratio;
- means for determining a correlation gain based on a number of digital sample values used to perform the cross correlating;
- and
- means for determining cross-polarization isolation based on a difference between the correlation gain and the peak signal-to-noise ratio.
4 more elements
A system for determining cross-polarization isolation, comprising:
- an antenna that receives a modulated signal, the modulated signal including a modulated co-polarized signal component and a modulated cross-polarized signal component;
- and
- a signal processor that determines cross-polarization isolation using the modulated co-polarized signal component and the modulated cross-polarized signal component, wherein signal processor determines the cross-polarization isolation by:
- 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 to obtain 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 obtain the cross-correlation vector;
- and determining a difference between the correlation gain and the peak signal-to-noise ratio.
4 more elements
A system for determining cross-polarization isolation, comprising:
- an antenna that receives a signal, the signal including a co-polarized signal component and a cross-polarized signal component;
- and
- a signal processor that cross correlates a vector of digital sample values obtained from the co-polarized signal component with a vector of digital sample values obtained from the cross-polarized signal component to obtain a cross-correlation vector, and that determines cross-polarization isolation using results of the cross correlating to obtain a peak signal-to-noise ratio, wherein the peak signal-to-noise ratio is determined by identifying a peak value from the cross-correlation vector, determining an average of values from the cross-correlation vector and obtaining a ratio of the peak value to the average.
A system for determining cross-polarization isolation, comprising:
- an antenna that receives a signal, the signal including a co-polarized signal component and a cross-polarized signal component;
- and
- a signal processor that:
- cross correlates a vector of digital sample values obtained from the co-polarized signal component with a vector of digital sample values obtained from the cross-polarized signal component;
- determines a first cross-polarization isolation using results of the cross correlating;
- determines a power spectral density for each of the co-polarized signal component and the cross-polarized signal component;
- determines a second cross-polarization isolation from a difference between the power spectral density of the co-polarized signal component and the power spectral density of the cross-polarized signal component;
- and that outputs a maximum of the first cross-polarization isolation and the second cross-polarization isolation.
5 more elements
A system for determining cross-polarization isolation, comprising:
- an antenna that receives a signal, the signal including a co-polarized signal component and a cross-polarized signal component;
- and
- a signal processor that:
- processes the co-polarized signal component to obtain a vector of digital sample values for the co-polarized signal component;
- processes the cross-polarized signal component to obtain a vector of digital sample values for the cross-polarized signal component;
- cross correlates the vector for the co-polarized signal component with the vector for the cross-polarized signal component and using results of the cross correlating to obtain a peak signal-to-noise ratio;
- determines a correlation gain based on a number of digital sample values used to perform the correlating;
- and determines cross-polarization isolation based on a difference between the correlation gain and the peak signal-to-noise ratio.
5 more elements
A non-transitory computer readable medium having stored thereon computer code which, when executed, implements a method of determining cross-polarization isolation, the method comprising:
- obtaining a modulated signal, the modulated signal including a modulated co-polarized signal component and a modulated cross-polarized signal component;
- and
- 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.
5 more elements
A non-transitory computer readable medium having stored thereon computer code which, when executed, implements a method of determining cross-polarization isolation, the method comprising:
- obtaining a signal, the signal including a co-polarized signal component and a cross-polarized signal component;
- cross correlating a vector of digital sample values obtained from the co-polarized signal component with a vector of digital sample values obtained from the cross-polarized signal component wherein the results of the cross correlating comprise a cross-correlation vector;
- and
- determining cross-polarization isolation using results of the cross correlating to obtain a peak signal-to-noise ratio, wherein the peak signal-to-noise ratio is determined by identifying a peak value from the cross-correlation vector, determining an average of values from the cross-correlation vector and obtaining a ratio of the peak value to the average.
1 more element
A non-transitory computer readable medium having stored thereon computer code which, when executed, implements a method of determining cross-polarization isolation, the method comprising:
- obtaining a signal, the signal including a co-polarized signal component and a cross-polarized signal component;
- cross correlating a vector of digital sample values obtained from the co-polarized signal component with a vector of digital sample values obtained from the cross-polarized signal component;
- determining a first cross-polarization isolation using results of the cross correlating;
- determining a power spectral density for each of the co-polarized signal component and the cross-polarized signal component;
- determining a second cross-polarization isolation from a difference between the power spectral density of the co-polarized signal component and the power spectral density of the cross-polarized signal component;
- and
- determining a maximum of the first cross-polarization isolation and the second cross-polarization isolation.
4 more elements
A non-transitory computer readable medium having stored thereon computer code which, when executed, implements a method of determining cross-polarization isolation, the method comprising:
- obtaining a signal, the signal including a co-polarized signal component and a cross-polarized signal component;
- processing the co-polarized signal component to obtain a vector of digital sample values for the co-polarized signal component;
- processing the cross-polarized signal component to obtain a vector of digital sample values for the cross-polarized signal component;
- cross correlating the vector for the co-polarized signal component with the vector for the cross-polarized signal component and using results of the cross correlating to obtain a peak signal-to-noise ratio;
- determining a correlation gain based on a number of digital sample values used to perform the correlating;
- and
- determining cross-polarization isolation based on a difference between the correlation gain and the peak signal-to-noise ratio.
4 more elements
Dependencies are inferred from the claim text.