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Method of differential-phase/absolute-amplitude QAM

  • US 20040247052A1
  • Filed: 06/04/2003
  • Published: 12/09/2004
  • Est. Priority Date: 06/04/2003
  • Status: Active Grant
First Claim
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1. A method of amplitude scale tracking to substantially reduce scale variations in a received quadrature amplitude modulated signal, the method comprising the steps of:

  • (a) determining an amplitude ratio of two or more consecutive sampled amplitude values;

    (b) determining whether the amplitude ratio represents a valid transition;

    (c) identifying, for a determined valid transition, one or more of the two or more consecutive sampled amplitude values with ideal amplitude levels;

    (d) determining a scale factor value based upon the identified consecutive sampled amplitude value; and

    (e) using the scaling factor value to scale and compensate for any changes in strength of the received quadrature amplitude modulated signal.

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