Digital demodulator for quadrature amplitude and phase modulated

Details Digital demodulator for quadrature amplitude and phase modulated Digital demodulator for quadrature amplitude and phase modulated

1997-01-21

1998-06-16

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

375261, 375324, H04L 2738

Patent

active

057677395

ABSTRACT:
Digital demodulator for a quadrature-modulated signal (sq) which transmits a combination signal by amplitude and phase modulation. A quadrature-signal source provides a digitized in-phase component (I) and a digitized quadrature component (Q) of low frequency. A resolver converts the two components (I,Q) into a magnitude signal (b) and a first phase signal (p1). A first feedback control loop and a second feedback control loop that maintains the slope (mp) of the first phase signal (p1) at the zero value and the time average (pm1) at the zero phase position, whereby a third phase signal (p3) is formed. From the resulting signals (b, p3, p3') a decoder forms at least one of the required components (R,L,P).

REFERENCES:
patent: 5497400 (1996-03-01), Carson et al.

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