Frequency offset estimator for upstream cable signals
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United States of America Patent
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Jun 17, 2014
Grant Date -
Mar 22, 2012
app pub date -
Sep 8, 2011
filing date -
Sep 17, 2010
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Abstract
In a DOCSIS transmission network, it is necessary for an upstream receiver to estimate and correct for errors in the carrier frequency of the transmission based upon observations of a preamble sequence. This task is complicated by the fact that microreflections in the upstream channels cause intersymbol interference, which tends to bias the frequency estimation circuit. An economical, ISI-immune algorithm is provided for estimating the carrier frequency of upstream transmissions. The arrangement improves the reliability of the frequency estimates in the presence of ISI, thereby reducing the overhead and increasing the throughput of the upstream channels.
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