Ghost canceler
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United States of America Patent
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Oct 27, 1998
Grant Date -
N/A
app pub date -
Apr 12, 1996
filing date -
Apr 12, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Embodiments of methods and apparatuses for removing ghosts from a signal such as a communications signal received over a channel where the output symbol pattern is used for selecting correction factors for correcting the received symbols. The correction factor is added to the sampled symbols and the sampled symbol is compared with a selected one of a plurality of thresholds based upon the closeness of the various thresholds to a sequence of the corrected symbol values. That comparison forms the basis for the next output symbol in the output sequence. Further, the selected correction factor is updated by taking the difference between the selected correction factor and an error measurement between the corrected sample value and the nominal value of the symbol times a damping factor. At various points in the sequence, the output is forced to an expected symbol sequence such as a clocking sequence used for clock recovery.
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