Technique for modulating orthogonal signals with one or more analog or digital signals

DC
  • US 5,642,379 A
  • Filed: 01/26/1995
  • Issued: 06/24/1997
  • Est. Priority Date: 06/14/1993
  • Status: Expired due to Term
First Claim
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1. Apparatus comprisingfirst means for providing a plurality of first component signals from a bandlimited analog signal, said analog signal being representable by samples generated at no less than a predetermined rate and each component signal being representable by samples generated at a rate less than said predetermined rate;

  • second means for providing a plurality of second component signals from a digital information signal; and

    means for modulating each orthogonal signal in a set of orthogonal signals with a corresponding one of said first component signals at certain times and for modulating each said orthogonal signal with a corresponding one of said second component signals at other times wherein said other time includes a time when the value of said digital signal is a priori known and also includes another time when the value of the digital signal is not known.

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