Blind carrier tracking loop
First Claim
Patent Images
1. Apparatus for use in a carrier tracking loop, the apparatus comprising:
- a phase lock loop configured to perform blind tracking of a carrier in a received signal;
wherein the phase lock loop comprisesa detector configured to use energy from both band edges of the received signal to drive the phase lock loop;
wherein the detector comprises at least two Hilbert-type filters and at least two delay elements, together configured to detect energy from both band edges of the received signal.
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Abstract
A receiver is an ATSC (Advanced Television Systems Committee)-receiver and comprises a phase lock loop (PLL) for performing carrier tracking of a carrier in a received signal. The PLL includes a detector (160) comprising two pseudo-Hilbert filters (205, 215). The detector uses energy from both band edges of the received ATSC signal for driving the PLL.
7 Citations
15 Claims
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1. Apparatus for use in a carrier tracking loop, the apparatus comprising:
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a phase lock loop configured to perform blind tracking of a carrier in a received signal; wherein the phase lock loop comprises a detector configured to use energy from both band edges of the received signal to drive the phase lock loop;
wherein the detector comprises at least two Hilbert-type filters and at least two delay elements, together configured to detect energy from both band edges of the received signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for use in a carrier tracking loop, the method comprising:
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performing blind tracking of a carrier in a received signal with a phase lock loop; and driving the phase lock loop as a function of detected energy from both band edges of the received signal;
wherein the driving step includes using at least two Hilbert-type filters and at least two delay elements, together for detecting energy from both band edges of the received signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. Apparatus for use in a carrier tracking loop, the apparatus comprising:
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a phase lock loop configured to perform tracking of a carrier in a received signal to provide a downconverted received signal, wherein the phase lock loop comprises a detector configured to use energy from both band edges of the received signal to drive the phase lock loop; and a delay and/Hilbert filter element coupled to the received signal, wherein the phase lock loop de-rotates an output signal of the delay and/Hilbert filter element to provide the downconverted received signal.
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15. A method for use in a carrier tracking loop, the method comprising:
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performing tracking of a carrier in a received signal with a phase lock loop for providing a downconverted received signal; driving the phase lock loop as a function of detected energy from both band edges of the received signal; and processing the received signal with a delay and/Hilbert filter element, wherein the phase lock loop de-rotates an output signal of the delay and Hilbert filter element for providing the downconverted received signal.
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Specification