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FEATURELESS COHERENT CHAOTIC AMPLITUDE MODULATION

  • US 20090310650A1
  • Filed: 06/12/2008
  • Published: 12/17/2009
  • Est. Priority Date: 06/12/2008
  • Status: Active Grant
First Claim
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1. A method for generating a chaotic amplitude modulated signal absent of cyclostationary features by preserving a constant variance, comprising the steps of:

  • generating a PAM signal including pulse amplitude modulation having a periodically changing amplitude;

    generating a first part of a constant power envelope signal (FPCPES) by dividing said PAM signal by a square root of a magnitude of said PAM signal;

    generating a second part of said constant power envelope signal (SPCPES) having a magnitude equal to a square root of one minus said magnitude of said PAM signal;

    generating first and second spreading sequences formed as sequences of random values;

    combining said FPCPES with said first spreading sequence to generate a first product signal;

    combining said SPCPES with said second spreading sequence to generate a second product signal; and

    generating a constant power envelope signal using said first and second product signals.

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