| 摘要 |
There is described a signal processing system comprising at least one control loop having a forward path and a feedback path; signal processing means (5) for producing a representation of the desired downstream output amplitude and phase as a pair of substantially orthogonal signal components (I(t), Q(t)); feedback-path splitting means (10) for splitting a feedback signal (y'(t)) into a plurality of substantially orthogonal feedback signal components (Ifb, Qfb); first combining means (6, 7) for combining the substantially orthogonal feedback signal components (Ifb, Qfb) with the corresponding substantially orthogonal signal components (I(t), Q(t)) to create error signals (Ierr, Qerr); a plurality of modulating means (8d, 8e) which control the amplitude, frequency and/or phase of said pair of substantially orthogonal signal components (I(t), Q(t)) on the basis of control signals (I'err, Q'err) which are derived from the error signals (Ierr, Qerr); and second combining means (8a) for combining the outputs of said plurality of modulating means (8d, 8e) into an output signal (y(t)); wherein a phase-shift control means (12) in the forward path of the control loop which derives said control signals (I'err, Q'err) from said error signals (Ierr, Qerr) on the basis of monitored signal values from at least one predetermined point (13-17) in the signal processing system.
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