Method of estimating pilot signal phase in a digitally modulated RF signal
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United States of America Patent
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Apr 2, 2002
Grant Date -
N/A
app pub date -
Nov 3, 1998
filing date -
Nov 3, 1998
priority date (Note) -
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Abstract
A method of estimating pilot signal phase embedded in a wideband digital signal modulating a RF signal that is down converted to an intermediate frequency and digitized includes the steps of summing a block of the signal samples for removing the modulation data and generating data values representative of vector locations of the pilot signal with each data value representing an angular rotation of the pilot signal vector, and calculating the phase of the pilot signal by determining the arc tangent of the data values. The method produces a computationally efficient narrow band filter generated at the pilot signal frequency by simple addition of the digital data values. The method is usable in a software based 8-VSB digital television demodulation system.
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