Digital quadriphase-shift keying modulator
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United States of America Patent
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Jun 4, 1996
Grant Date -
N/A
app pub date -
Oct 13, 1994
filing date -
Oct 13, 1994
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Abstract
A digital quadriphase-shift keying modulator is described which generates a modulated intermediate carrier frequency (IF) based on a desired number of samples for each input information bit. The design includes a ROM (or RAM) look-up table which stores digitized waveforms. The inphase and quadrature components of a complex baseband signal are translated to an IF at a multiple of the sampling rate simply by alternating the inphase and quadrature samples and alternating signs. The real IF output is produced by summing the inphase and quadrature signals.
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