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

• US 20050286645A1
• Filed: 04/11/2005
• Published: 12/29/2005
• Est. Priority Date: 04/16/2004
• Status: Active Grant

• Current Assignee: Data Flow Technologies Incorporated
• Original Assignee: Stealth Management, Inc.
• Inventors: Kunzel, Ronald E., Brown, Forrest J., D'Alessandro, Kenneth
• Granted Patent: US 7,310,383 B2
• Time in Patent Office: Days
• US Class Current: 375/257
• CPC Class Codes: H04L 27/24 Half-wave signalling systems
• CPC Class Codes: H04L 27/2602 Signal structure

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 θ_n 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 θ_n, 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 θ_n 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 θ_n where data of the second value is to be encoded, the second function being different from Y=sin θ.

Claims

1-80. -80. (canceled)

81. 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;

whereineachsinewave carrier generators/modulators/combiner includes an encoder for generating at least one substantially sinusoidal waveform containing encoded digital data at selected phase angles on, the waveform having an amplitude Y=sin θ

at phase angles lying outside of regions having a range of Δ

θ

beginning at each phase angle θ

_n, the waveform having an amplitude Y=sin θ

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

θ

beginning at each phase angle on where data of the first value is to be encoded, the waveform having an amplitude Y defined by a different from Y=sin θ

at phase angles lying inside the 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.

82. A subscriber cable modem for a coaxial cable communications system employing single and multiple sinewave modulation techniques including:

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 on 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 regions having a range of Δ

θ

beginning at each phase angle θ

_n, the waveform having an amplitude Y=sin θ

at phase angles lying inside the 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 different from Y=sin θ

at phase angles lying inside the 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.

83. In a coaxial cable communications system including a head end employing single and multiple sinewave modulation techniques as in claim 82, a method for initiating a session with a subscriber cable modem including:

receiving a session-start attempt from a user cable modem;

querying the database for authorization of the user;

verifying a user ID and password if the user cable modem hardware is known;

sending a session authorization to the user cable modem if the user ID and password are verified;

sending a session refusal message to the user cable modem if the user ID and password are not verified; and

sending a new-account browser page to the user cable modem if the user cable modem hardware is unknown;