Multiplier-free IIR filter realizations with periodically time-varying coefficients

In this paper, we extend the periodically time-varying (PTV) filter realization, which was proposed for the FIR filter, to be used for IIR filters. The realization consists of ternary ({0, /spl plusmn/1}) or quinary ({0, /spl plusmn/1, /spl plusmn/2}) PTV coefficients with simple input and output units. The coefficients as well as the input and output units require no hardware multiplier. This simplifies the layout for VLSI implementation and increases the processing speed.