Method and apparatus for carrier recovery and compensation in spread spectrum communications
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Jan 23, 1997
filing date -
Jan 23, 1997
priority date (Note) -
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Abstract
An improved system and method for determining and tracking the carrier offset in a communications system. In an exemplary implementation, sampled spread spectrum digital signals are compensated with an expected carrier offset and stripped of pseudo-noise codes to produce demodulated signals. The demodulated signals are applied to a carrier offset estimator. The carrier offset estimator divides pairs of demodulated signals with a predetermined interval to produce results containing phase change information. The results are then averaged, and the average is normalized with respect to the predetermined interval to yield a new estimate of the carrier offset. The expected carrier frequency is adjusted based on the new offset estimate for frequency compensation in subsequent reception and transmission operations.
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