DISTORTION AND NOISE CANCELING SYSTEM FOR HFC NETWORKS
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United States of America Patent
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Issued Date -
Apr 30, 2009
app pub date -
Dec 14, 2007
filing date -
Oct 25, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Canceling and removing distortion and noise components of a signal generated in a hybrid fiber-coax (HFC) network. The system transmits an optical signal from an input side of an optical network unit of an existing HFC network to a coaxial distribution hub through a separate optical fiber jumper; converts the optical signal into a reference RF signal; extracts only the distortion and noise component by combining the reference RF signal with the degraded main RF signal, in opposite phase, containing distortions and noises generated, while the main RF signal passes through coaxial cables and cascaded coaxial amplifiers in coaxial paths of an HFC network; canceling out the distortion and noise component by combining the extracted distortion and noise component with the degraded main RF signal, in opposite phase.
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