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

  • US 7,471,721 B2
  • Filed: 09/28/2007
  • Issued: 12/30/2008
  • Est. Priority Date: 11/09/1999
  • Status: Active Grant
First Claim
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1. In a multicarrier modulation system including a first transceiver in communication with a second transceiver using a transmission signal having a plurality of carrier signals for modulating an input bit stream, each carrier signal having a phase characteristic associated with the input bit stream, a method for scrambling the phase characteristics of the carrier signals comprising:

  • associating each carrier signal with a value determined independently of any input bit value carried by that carrier signal;

    computing a phase shift for each carrier signal based on the value associated with that carrier signal; and

    combining the phase shift computed for each carrier signal with the phase characteristic of that carrier signal so as to substantially scramble the phase characteristics of the plurality of carrier signals.

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