Agile distortion and noise cancellation across multiple channels and ports in a CATV upconverter/modulator
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United States of America Patent
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Jul 30, 2013
Grant Date -
Aug 4, 2011
app pub date -
Jan 28, 2011
filing date -
Feb 2, 2010
priority date (Note) -
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Abstract
A distortion-cancellation method for analog CATV or QAM transmission over cable is provided wherein a single feedback path from the output of a multiple-channel multiple-port upconverter/modulator is down-converted and used to reduce or cancel undesirable noise components including LO leakage, spurious, and modulated noise. The method allows for real-time monitoring, tuning, or control of the CATV/QAM output and of interfering signals and aging effects as compared to a desired performance metric.
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