Digitally processed demodulator for quadrature modulated signals

Details Digitally processed demodulator for quadrature modulated signals Digitally processed demodulator for quadrature modulated signals

1987-02-17

1988-04-12

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329145, 375 82, H03D 318

Patent

active

047377283

ABSTRACT:
A digital demodulator for separating and demodulating quadrature modulated signals to produce the inphase components and quadrature components of a baseband through simple digital processing. This digital demodulator is constructed by an A/D converter for sampling received modulated signal so as to be converted into digital signals, means for distributing every other sample signal of the sample signals from said A/D converter into two trains of the sample signals, means for inverting the polarity of every other signal of the one signal train so as to provide the inphase components of the baseband, and means for delaying the other signal sequence by one sampling period and thereafter inverting the polarity of every other signal of the delayed signals so as to provide the quadrature components of the baseband.

REFERENCES:
patent: 4475219 (1984-10-01), Puckette
Van Gerwin et al., "Microprocessor Implementation of High--Speed Data Modems", IEEE Trans. on Comm., Com--25, No. 2 (1977), pp. 238-250.

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