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Method for signal transmission using spectrally efficient orthogonal modulation

  • US 5,640,423 A
  • Filed: 12/16/1993
  • Issued: 06/17/1997
  • Est. Priority Date: 12/16/1993
  • Status: Expired due to Term
First Claim
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1. A method for digital signal transmission, comprising the steps of:

  • encoding in each of N symbols a plurality of data bits under a conventional coding scheme;

    modulating each of said N symbols for a predetermined time interval onto a corresponding one of N substantially band limited finite duration orthogonal waveforms;

    summing each of said N modulated waveforms, aligned in time, to obtained a summed waveform;

    modulating said summed waveform for said predetermined time interval onto a carrier signal; and

    transmitting said modulated summed waveform in a communication channel.

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