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US 9,048,979 B2Granted
RF carrier synchronization and phase alignment methods and systems
AssigneePhasorLab, Inc.
InventorJoshua C. Park
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Abstract
A method comprising generating a baseband information signal by mixing a received modulated carrier signal with a local oscillator (LO) signal having an LO frequency; obtaining baseband signal samples of the baseband information signal having a baseband signal magnitude and a baseband signal phase; determining a cumulative phase measurement associated with baseband signal samples having a baseband signal magnitude greater than a threshold; and, applying a correction signal to compensate for an LO frequency offset of the LO frequency based on the cumulative phase.
Claims3
A method comprising:
- generating a baseband information signal by mixing a received modulated carrier signal with a local oscillator (LO) signal having an LO frequency;
- obtaining baseband signal samples of the baseband information signal having an in-phase signal sample and a quadrature signal sample;
- determining an offset frequency rotation based on an estimated correlation between the in-phase signal samples and the quadrature signal samples;
- processing the baseband information signal using the offset frequency rotation;
- determining an offset phase associated with the estimated correlation between the in-phase signal samples and the quadrature signal samples;
- processing the baseband information signal using the offset phase;
- and
- determining the offset phase based on a symmetry property of the estimated correlation, the symmetry property being measured with respect to a plurality of frequency offsets.
5 more elements
A method comprising
- generating a baseband information signal by mixing a received modulated carrier signal with a local oscillator (LO) signal having an LO frequency;
- obtaining baseband signal samples of the baseband information signal having an in-phase signal sample and a quadrature signal sample;
- determining an offset frequency rotation based on an estimated correlation between the in-phase signal samples and the quadrature signal samples;
- processing the baseband information signal using the offset frequency rotation;
- determining an offset phase associated with the estimated correlation between the in-phase signal samples and the quadrature signal samples;
- processing the baseband information signal using the offset phase;
- and
- determining the offset frequency rotation and offset phase with respect to a maximum value of the estimated correlation, wherein the estimated correlation is calculated using a plurality of candidate phase offsets over a first range and candidate frequency rotations over a second range.
5 more elements
Dependencies are inferred from the claim text.