System and method for scrambling the phase of the carriers in a multicarrier communications system

  • US 6,961,369 B1
  • Filed: 11/09/2000
  • Issued: 11/01/2005
  • Est. Priority Date: 11/09/1999
  • Status: Active Grant
First Claim
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1. In multicarrier modulation communications utilizing a plurality of QAM-modulated carrier signals, each carrier signal having a phase characteristic based on a QAM modulation, a method of randomizing the phase characteristics of the carriers comprising:

  • generating an array of pseudo-random numbers;

    determining a phase shift for each carrier signal by multiplying a value from the array of pseudo-random numbers times (π

    /m) mod 2π

    , where m is an integer; and

    adding the determined phase shift for each carrier signal to the phase characteristic of each carrier signal.

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