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Adaptive correlation for detection of a high-frequency signal

  • US 8,477,828 B2
  • Filed: 12/02/2008
  • Issued: 07/02/2013
  • Est. Priority Date: 12/02/2008
  • Status: Active Grant
First Claim
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1. A receiver, comprising:

  • a coherent integration stage configured to coherently integrate a signal downconverted using a downconversion frequency, wherein the coherent integration is performed over a first period of integration to produce a pre-detection sample;

    a phase error detection stage coupled to an output of the coherent integration stage, the phase error detection stage configured to produce a phase error signal representing a phase error of the pre-detection sample;

    a detection stage coupled to the output of the phase error detection stage, the detection stage configured to produce a decision statistic employing the pre-detection sample, wherein the decision statistic is compared to a threshold to prevent false acquisition; and

    a correction stage coupled to the output of the phase error detection stage, the correction stage configured to output a downconversion frequency adjustment signal in response to the phase error signal, wherein the phase error detection stage is configuredto delay a plurality of the pre-detection samples,to form a complex conjugate of the plurality of the delayed pre-detection samples,to form a sum of products over a second period of integration of the plurality of the pre-detection samples with the plurality of the delayed and complex conjugated pre-detection samples, andto produce the phase error signal dependent on an angular coordinate of the sum of products.

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