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Design of predictive IIR filters via feedback extension of FIR forward predictors

FIR predictors for polynomial signals and sinusoids are easy to design because of the available closed-form design formulae. On the other hand, those FIR predictors have two major drawbacks: the passband gain peak is usually greater than +3 dB, and a long FIR structure is needed to attain high attenuation in the stopband. Both of these characteristics cause severe problems, particularly in embedded control applications when the predictor operates inside a closed control loop. In this paper, we present a novel feedback extension scheme for FIR forward predictors. This extension makes it possible to easily design IIR predictors with low passband ripple and high stopband attenuation. The new approach is illustrated with design examples.