FIELD: physics.
SUBSTANCE: IQ-modulator pre-distortion device includes two digital filters for compensating for IQ-modulator generated amplitude errors and filtering intermodulation from quadrature to the inphase component of the signal, a first shift compensator for compensating for shift errors of the inphase signal component and a second shift compensator for compensating for shift errors of the quadrature signal component, two iteratively updated digital filters (gQ0, gQ1, gl0, gl1) for filtering each branch of the IQ-signal to compensate for IQ-modulator generated amplitude errors in each branch.
EFFECT: compensation for amplitude and phase errors.
12 cl, 8 dwg
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