Patent ID: 8477828

Claim:
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 configured to 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, and to produce the phase error signal dependent on an angular coordinate of the sum of products.