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Head end receiver for digital data delivery systems using mixed mode SCDMA and TDMA multiplexing

  • US 7,050,419 B2
  • Filed: 02/23/2001
  • Issued: 05/23/2006
  • Est. Priority Date: 02/23/2001
  • Status: Expired due to Term
First Claim
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1. A digital data receiver, comprising:

  • first means for suppressing frequencies in an input spectrum other than the frequency components of a desired carrier and digitizing at least said desired carrier;

    second means for recovering data encoded in one or more burst type transmitted at different times on the same frequency subchannel, said bursts being any of a plurality of different burst types, and for recovering data encoded in two TDMA bursts transmitted at the same first symbol rate on two adjacent frequency channels during a first interval as well as the data from multiple services encoded in an SCDMA burst transmitted during a second interval that does not overlap said first interval and having a symbol rate which is twice as high as the symbol rate of said TDMA bursts and transmitted on a frequency channel having a center frequency approximately at the boundary frequency between said two adjacent frequency channels on which said TDMA bursts were transmitted, said burst types characterized by at least the following characteristics;

    DOCSIS 1.0 or 1.1 time division multiplexed;

    advanced PHY time division multiplexed or synchronous code division multiplexed, and any one of a plurality of different symbol rates and modulation types; and

    having programmable interleaving depth and block size, and being or not being Trellis code modulated; and

    means for controlling said first and second means to operate correctly to receive the particular type of burst or bursts being received on one or more selectable frequency channels.

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