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US 7,680,178 B2Granted
Cross-correlation detection and elimination in a receiver
AssigneeSiRF Technology, Inc.
InventorsSundar Raman, Reza Abtahi, Steven A. Gronemeyer, Andrew Chou
Life of this patent
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Abstract
A communication device with cross-correlation detection based upon statistical tests to determine whether the off-peak signal energy is consistent with auto-correlation energy levels.
Claims18
A device, comprising:
- a receiver capable of receipt of a signal that contains more than one pseudo noise (PN) coded signal component;
- a memory coupled to the receiver that stores a plurality of off-peak energy values associated with a PN;
- and
- a controller coupled to the memory that identifies a sub-set of off-peak energy values are off-peak energy values in order to identify auto-correlation and cross-correlation using the off-peak energy values, and if inconclusive the controller calculates an average of off-peak energy values to identify auto-correlation and cross correlation, where a maximum off-peak energy value from the plurality of off-peak energy values is identified and compared to a predetermined threshold in order to identify auto-correlation.
1 more element
A method for determining auto-correlation or cross correlation of a signal, comprising:
- receiving a signal from a receiver that contains more than one pseudo noise (PN) coded signal component;
- storing in a memory coupled to the receiver a plurality of off-peak energy values associated with a PN;
- and
- retrieving a sub-set of off-peak energy values with a controller that is coupled to the memory that are off-peak energy values in order to identify auto-correlation and cross-correlation using the oft-peak energy values, with
- identifying where a maximum off-peak energy value from the plurality of off-peak energy values;
- and
- comparing the maximum off-peak energy value to a predetermined threshold in order to identify auto-correlation;
- and if inconclusive the controller calculates an average of off-peak energy values to identity auto-correlation and cross-correlation.
5 more elements
A device for determining auto-correlation or cross correlation of a signal, comprising:
- means for receiving the signal that contains more than one pseudo noise (PN) coded signal component;
- means for storing a plurality of off-peak energy values associated with a PN;
- and
- means for retrieving a sub-set of off-peak energy values that are off-peak energy values in order to identify auto-correlation and cross-correlation using the off-peak energy values with
- means for identifying where a maximum off-peak energy value from the plurality of off-peak energy values;
- and
- means for comparing the maximum off-peak energy value to a predetermined threshold in order to identify auto-correlation;
- and if inconclusive the controller calculates an average of off-peak energy values to identify auto-correlation and cross-correlation.
5 more elements
Dependencies are inferred from the claim text.