Quadrature modulator imbalance estimator and modulator stage using it
AssigneeAlcatel
InventorsRossano Marchesani, Jean-Xavier Canonici
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Abstract
An imbalance estimator for quadrature modulators comprising two mixers to which are applied two carrier signals and to each of which is applied a modulating signal, output signals of said mixers being applied to a combiner to constitute a modulated signal, detects the instantaneous power of the modulated signal. The detected instantaneous power is multiplied by the modulating signals, and the resulting signals are rectified. The rectified signals are rectified to supply signals indicative of the imbalance of the modulator.
Claims20
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- means for detecting an instantaneous power of said modulated signal;
- means for multiplying said detected instantaneous power by said modulating signals, said multiplying means supplying produced signals;
- means for rectifying said produced signals;
- and
- means for integrating said rectified produced signals, supplying signals indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- means for detecting an instantaneous power of said modulated signal;
- means for multiplying said detected instantaneous power by absolute values of said modulating signals, said multiplying means supplying rectified produced signals;
- and
- means for integrating said rectified produced signals, thereby supplying signals indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- means for detecting an instantaneous power of said modulated signal;
- means for multiplying said detected instantaneous power by said modulating signals, said multiplying means supplying produced signals;
- means for rectifying said produced signals;
- and
- means for integrating a difference between said rectified produced signals, thereby supplying a single signal indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- means for detecting an instantaneous power of said modulated signal;
- means for multiplying said detected instantaneous power by absolute values of said modulating signals, said multiplying means supplying rectified produced signals;
- and
- means for integrating a difference between said rectified produced signals, thereby supplying a single signal indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- a power detector for detecting an instantaneous power of said modulated signal;
- at least one multiplier for multiplying said detected instantaneous power by said modulating signals, said at least one multiplier supplying produced signals;
- a rectifier for rectifying said produced signals;
- and
- an integrator for integrating said rectified produced signals, supplying signals indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- a detector detecting an instantaneous power of said modulated signal;
- a multiplier multiplying said detected instantaneous power by absolute values of said modulating signals, said multiplier supplying rectified produced signals;
- and
- an integrator integrating said rectified produced signals, thereby supplying signals indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- a detector detecting an instantaneous power of said modulated signal;
- at least two multipliers multiplying said detected instantaneous power by respective ones of said modulating signals, said multipliers supplying produced signals;
- at least two rectifiers rectifying said produced signals;
- and
- an integrator integrating a difference between said rectified produced signals, thereby supplying a single signal indicative of an amplitude imbalance of said modulator.
An imbalance estimator for a quadrature modulator comprising two mixers, to which are respectively applied two carrier signals, and to which are respectively applied modulating signals, output signals of said mixers being applied to a combiner to constitute a modulated signal, said estimator including:
- a detector detecting an instantaneous power of said modulated signal;
- at least two multipliers multiplying said detected instantaneous power by absolute values of respective ones of said modulating signals, said multipliers supplying rectified produced signals;
- and
- an integrator integrating a difference between said rectified produced signals, thereby supplying a single signal indicative of an amplitude imbalance of said modulator.
Dependencies are inferred from the claim text.