Quadrature modulator malfunction estimator and modulator stage u

Details Quadrature modulator malfunction estimator and modulator stage u Quadrature modulator malfunction estimator and modulator stage u

1997-11-12

1999-03-16

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332123, 332162, 375296, 375298, 455126, H04L 2720

Patent

active

058835512

ABSTRACT:
A quadrature modulator including two mixers to which two carrier signals are applied and to each of which a modulating signal is applied, output signals of the mixers being applied to a combiner to constitute a modulated signal. A defect estimator for the modulator detects a first signal representative of the instantaneous power of the modulated signal, generates a second signal representative of a reference envelope obtained from the modulating signals, and corrects the amplitude of one of the first and second signals in accordance with the mean amplitude difference observed between this amplitude corrected signal and the other signal. A processor supplies from the observed amplitude difference between the amplitude corrected signal and the other signal, at least one signal relating to the defect.

REFERENCES:
patent: 4930141 (1990-05-01), Ohmagari
patent: 5054037 (1991-10-01), Martineau et al.
patent: 5351016 (1994-09-01), Dent
patent: 5663691 (1997-09-01), Kowalik et al.

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