Coaxial cable communications systems and apparatus employing single and multiple sinewave modulation and demodulation techniques
First Claim
Patent Images
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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Abstract
A method for generating a substantially sinusoidal waveform containing encoded digital data having one of a first value and a second value at selected phase angles θn comprises generating the waveform having an amplitude Y defined by a first function at phase angles lying outside of regions having a range Δθ beginning at each phase angle θn, said first function being Y=sin θ; generating the waveform having an amplitude Y defined by the first function at phase angles lying inside the regions having a range of Δθ beginning at each phase angle θn where data of the first value is to be encoded; and generating the waveform having an amplitude Y defined by a second function at phase angles lying inside the regions having a range of Δθ associated with each phase angle θn where data of the second value is to be encoded, the second function being different from Y=sin θ.
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Citations
3 Claims
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1. A head end for a coaxial cable communications system employing single and multiple sinewave modulation techniques including:
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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; andwherein 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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2. A subscriber cable modem for a coaxial cable communications system employing single and multiple sinewave modulation techniques including:
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an internal bus; a controller coupled to the internal bus; a hardware ID unit coupled to the internal bus; a non-volatile memory coupled to the internal bus; a computer interface coupled to the internal bus; a control channel transceiver coupled to the internal bus; a multichannel transceiver coupled to the internal bus; wherein the control channel transceiver and the multichannel transceiver each include circuitry for 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 a receiver for receiving through the coaxial cable at least one substantially sinusoidal waveform 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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3. In a coaxial cable communications system including a head end employing single and multiple sinewave modulation techniques, a method for initiating a session with a subscriber cable modem including:
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receiving a session-start attempt from a user cable modem generating a modulated waveform comprising a 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;querying a database for authorization of the user; verifying a user ID and password if the user cable modem hardware is known; sending data indicating a session authorization to the user cable modem using the modulated waveform if the user ID and password are verified; sending data indicating a session refusal message to the user cable modem using the modulated waveform if the user ID and password are not verified; and sending a new-account browser page to the user cable modem using the modulated waveform if the user cable modem hardware is unknown.
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Specification
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Current AssigneeData Flow Technologies Incorporated
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Original AssigneeData Flow Technologies Incorporated
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InventorsD'Alessandro, Kenneth, Brown, Forrest J., Kunzel, Ronald E.
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Primary Examiner(s)Lugo, David B.
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Application NumberUS11/104,301Publication NumberTime in Patent Office981 DaysField of Search375/259, 375/260, 375/268, 375/300, 375/320, 332/149, 455/108US Class Current375/300CPC Class CodesH04L 27/24 Half-wave signalling systemsH04L 27/2602 Signal structure
