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Method of demodulating digitally modulated signals, and apparatus implementing such a method

  • US 4,885,756 A
  • Filed: 05/23/1988
  • Issued: 12/05/1989
  • Est. Priority Date: 05/21/1987
  • Status: Expired due to Term
First Claim
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1. A digital method of demodulating digitally modulated signals, said method comprising the steps of:

  • acquiring digitized samples of said signals;

    calculating phase samples from said digitized samples and storing said phase samples;

    generating a plurality of symbol rate phase hypotheses on the basis of said stored phase samples;

    calculating a carrier phase from said phase samples for each of said plurality of hypotheses, selecting one of said calculated carrier phases and its corresponding symbol rate phase hypothesis to obtain a selected carrier phase and symbol rate phase over a predetermined number of symbols; and

    demodulating said digitally modulated signals by comparing the selected carrier phase to the phase of said digitally modulated signal during a symbol under consideration.

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