Patent ID: 7310383

Claim:
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 Δθ 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 Δθ 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.