System and method for automatic frequency correction in a pilot symbol assisted demodulator
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United States of America Patent
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-
Feb 11, 2003
Grant Date -
N/A
app pub date -
Nov 12, 1998
filing date -
Nov 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for selecting a frequency offset for automatic frequency correction in a pilot symbol assisted demodulation system comprises the steps of receiving a signal comprising a plurality of symbols having discrete possible values, and pilot symbols at predetermined locations in the signal having a predetermined value. The method further includes selecting a set of postulates defining a range of frequency offsets, multiplying the pilot symbols and selected ones of the plurality of the symbols by a sinusoid of the postulates to compensate for the postulated error, and estimating the channel at the error-compensated pilot symbols. The estimated channel at the error-compensated pilot symbols is then interpolated and a metric is generated for the error-compensated pilot and the selected symbols using the symbols' discrete possible values and the interpolated estimated channel. The postulate with a minimum accumulated metric is used in demodulating the symbols.
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