A computationally simple approach of model order reduction for single input single output (SISO) and linear time invariant discrete systems modeled in frequency domain is proposed in this paper. The denominator polynomial of the reduced order model is obtained by using the basic characteristics of the higher order system which are maintained in the reduced model while the coefficients of the numerator are obtained by using modified cauer form. This method is fundamentally simple and generates stable reduced models if the original high-order system is stable. The proposed method is illustrated with the help of the numerical example taken from the literature.

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Keywords: Model Order Reduction, Discrete-Time System, Higher Order System, Modified Cauer Form.