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Coaxial cable communications systems and apparatus employing single and multiple sinewave modulation and demodulation techniques

  • US 7,310,383 B2
  • Filed: 04/11/2005
  • Issued: 12/18/2007
  • Est. Priority Date: 04/16/2004
  • Status: Expired due to Fees
First Claim
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1. A head end for a coaxial cable communications system employing single and multiple sinewave modulation techniques including:

  • a data backbone interface;

    a controller;

    a database coupled to the controller;

    a control channel coupled to the controller;

    an internal data bus and an internal control bus coupled to the controller and the data backbone interface;

    a coaxial cable;

    a plurality of sinewave carrier generators/modulators/combiner coupled to the internal data bus and an internal control bus and the coaxial cable;

    a plurality of receivers/detectors coupled to the internal data bus and an internal control bus and the coaxial cable;

    wherein each sinewave carrier generators/modulators/combiner includes an encoder for generating at least one substantially sinusoidal waveform containing encoded digital data at selected phase angles θ

    n, the waveform having an amplitude Y=sin θ

    at phase angles lying outside of data regions, the waveform having an amplitude Y=sin θ

    at phase angles lying inside the data regions having a range of Δ

    θ

    beginning at each phase angle θ

    n where data of the first value is to be encoded, the waveform having an amplitude Y defined by a function different from Y=sin θ

    at phase angles lying inside the data regions having a range of Δ

    θ

    associated with each phase angle θ

    n where data of the second value is to be encoded, and a combiner for combining the substantially sinusoidal waveforms and driving them onto the coaxial cable; and

    wherein each receiver detector includes a receiver for receiving through the coaxial cable a plurality of substantially sinusoidal waveforms containing encoded digital data and a decoder for extracting the digital data from each of the substantially sinusoidal waveforms containing encoded digital data.

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