Detecting CPD in HFC network with OFDM signals
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United States of America Patent
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Apr 25, 2017
Grant Date -
Apr 28, 2016
app pub date -
Oct 21, 2015
filing date -
Oct 22, 2014
priority date (Note) -
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Abstract
A apparatus or method for detecting CPD in an HFC network, comprising: (a) acquiring digital RF downstream signals from a CMTS or CM; (b) emulating even and odd order IM distortion products from the downstream signals; (c) acquiring RF upstream signals from the CMTS during a quiet period; (d) cross-correlating the RF upstream signals with the emulated even and odd order IM products to produce even and odd order cross-correlation functions, respectively; (e) accumulating, separately, a multiplicity of even and odd order cross-correlation functions; (f) calculating even and odd order cross-correlation envelopes from the accumulated even and odd order cross-correlation functions, respectively; and (g) detecting a CPD source from either or both of the even and odd order cross-correlation envelopes by the presence of a peak in either or both of the envelopes.
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International Classification(s)
- 2015 Application Filing Year
- H04L Class
- 33706 Applications Filed
- 25909 Patents Issued To-Date
- 76.87 % Issued To-Date
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- H04L Class
- 0 % this patent is cited more than
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