Adaptive correlation for detection of a high-frequency signal
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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Abstract
Embodiments related to acquisition, detection, and processing of a high-frequency signal are described and depicted.
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Citations
20 Claims
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1. A receiver, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver comprising:
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a coherent integration stage configured to coherently integrate a received signal over a first period of integration to produce a pre-detection sample, wherein the pre-detection sample is employed to adjust a duration of the first period of integration during acquisition of the received signal; and a detection stage coupled to an output of the coherent integration stage, the detection stage configured to produce a decision statistic employing the pre-detection sample, wherein the receiver is further 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, to produce a phase error signal dependent on an angular coordinate of the sum of products, wherein the phase error signal is employed to adjust the first period of integration during the acquisition of the received signal, and to compare the decision statistic to a threshold to prevent false acquisition. - View Dependent Claims (8, 9, 10, 11)
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12. A method of processing a received signal, the method comprising:
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integrating a signal downconverted by a downconversion frequency over a first period of coherent integration to produce a pre-detection sample; producing a phase error signal dependent on a phase error of the pre-detection sample; producing a decision statistic employing the pre-detection sample; comparing the statistic to a threshold to prevent false acquisition; and producing a downconversion frequency adjustment signal in response to the phase error signal, wherein producing the decision statistic comprises; delaying a plurality of the pre-detection samples; forming a complex conjugate of the plurality of the delayed pre-detection samples; forming 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 producing the phase error signal dependent on an angular coordinate of the sum of products. - View Dependent Claims (13, 14, 15)
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16. A method of processing a signal in a receiver, the method comprising:
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integrating the signal over a first period of coherent integration to produce a pre-detection sample; adjusting a duration of the first period of integration during acquisition of the received signal employing the pre-detection sample; producing a decision statistic employing the pre-detection sample; comparing the decision statistic to a threshold to prevent false acquisition; delaying a plurality of the pre-detection samples; forming a complex conjugate of the plurality of the delayed pre-detection samples; forming 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; producing a phase error signal dependent on an angular coordinate of the sum of products; and employing the phase error signal to adjust the first period of integration during the acquisition of the received signal. - View Dependent Claims (17, 18, 19, 20)
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Specification