DISTORTION AND NOISE CANCELING SYSTEM FOR HFC NETWORKS

摘要

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.