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Method and Apparatus for Characterizing Modulation Schemes in an HFC Network

  • US 20080101210A1
  • Filed: 12/20/2006
  • Published: 05/01/2008
  • Est. Priority Date: 10/26/2006
  • Status: Active Grant
First Claim
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1. An apparatus for characterizing modulation schemes for a network comprising:

  • a controller configured to instruct a network element to transmit a test signal at a test frequency at a first modulation scheme and a first power;

    a receiver configured to receive the test signal from the network element; and

    an equalizer which measures a signal to noise ratio of the test signal,wherein the controller determines if the signal to noise ratio is within a predetermined range of an estimated signal to noise ratio, and the controller determines that the modulation scheme has excessive inband interference or phase noise when the signal to noise ratio is not within a predetermined range of an estimated signal to noise ratio.

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