Pilot acquisition and local clock calibration with reduced MIPS
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United States of America Patent
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N/A
Issued Date -
Mar 23, 2006
app pub date -
Sep 22, 2004
filing date -
Sep 22, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a method, system, and apparatus for estimating a pilot frequency of a television broadcast signal at a receiver. In one aspect, the receiver constitutes a mobile device that uses the estimated pilot frequency to facilitate the determination of position location of the mobile device. The receiver includes a processor which estimates the pilot frequency by computing a baseband version of the pilot signal relative to a reference frequency, defining time-shifted segments for the pilot signal and its baseband version, computing phase correction terms using the pilot signal and its baseband version, phase correcting each received signal segment, and estimating the pilot frequency. In another aspect of the invention, a phase-locked-loop is used to track the phase of the incoming pilot signal. The loop filter and/or the phase of the numerically controlled oscillator is scaled to account for the non-integer nature of samples within the received segments.
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