Frequency auto-correction apparatus for CDMA multipath fading channel
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United States of America Patent
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Aug 22, 2006
Grant Date -
Apr 15, 2004
app pub date -
Dec 12, 2001
filing date -
Dec 18, 2000
priority date (Note) -
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Abstract
An automatic frequency correction (AFC) apparatus used for CDMA multipath fading channels comprises a frequency-offset evaluator, an automatic frequency correction loop filter and a carrier frequency adjuster. The present invention provides a 'multipath energy window' designing method for the non-determinacy of multipath signals in mobile communication environment. Frequency-offset information can be extracted from the multipath energy window by a simple calculation and evaluated by a maximal SNR weight process. This invention also provides a step-variable accumulation adjusting method and greatly improves the response speed of the AFC apparatus as compared with a conventional loop filter, whereby supplies better AFC required for CDMA mobile terminals.
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