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Burst mode digital communications system

  • US 6,493,398 B1
  • Filed: 01/26/1999
  • Issued: 12/10/2002
  • Est. Priority Date: 10/07/1996
  • Status: Expired due to Term
First Claim
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1. A method of modulating using a plurality of digital data blocks as carrier segments of a carrier, the method of modulating comprising the steps:

  • creating a table of amplitude coefficients representing predetermined shapes, each of said predetermined shapes beginning and ending with zero slope edges;

    storing the table of amplitude coefficients in a read only memory look-up table;

    sequentially receiving the plurality of digital data blocks, wherein each of the plurality of digital data blocks has a predetermined discrete value associated therewith out of a predetermined number of possibly assigned discrete values;

    creating modulated carrier segments using each of the plurality of digital data blocks;

    accessing a succession of address locations in the read only look-up table for stored amplitude coefficients corresponding to said predetermined shapes for each of the plurality of digital data blocks;

    retrieving an equal number of successive stored amplitude coefficients from the read only memory look-up table that correspond to said predetermined shapes for each of the plurality of digital data blocks; and

    directing the equal number of successive stored amplitude coefficients corresponding to said predetermined shapes to a digital-to-analog converter to produce a carrier waveform.

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