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Method to minimize compatibility error in hierarchical modulation using variable phase

  • US 20050113040A1
  • Filed: 10/27/2004
  • Published: 05/26/2005
  • Est. Priority Date: 11/26/2003
  • Status: Abandoned Application
First Claim
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1. A method for transmitting at least two levels of data in a hierarchical transmission system comprising the steps of:

  • generating a first modulated signal based on first input data;

    superimposing at least a second modulation on the first modulated signal based on at least a second input data, the second modulation being spread across a plurality of symbols in the first modulated signal in a predetermined pattern to create a modified signal;

    transmitting the modified signal;

    decoding the modified signal by performing a first demodulation of the first modulated signal then a second demodulation to obtain the first input data and the second input data.

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