A DESIGN OF LINEAR-PHASED IIR NYQUIST FILTERS

This paper discusses a new method to design linear-phased IIR Nyquist filters with zero intersymbol interference. The filters designed by th is method possess linear-phase characteristics and are lower in order than other Nyquist filters designed by existing methods. Expressions a re derived for zero phased IIR Nyquist filters and efficient design me thods are examined for them. The opted design method is based on an it eration process, and in each iteration step a modified version of the Remez exchange algorithm is used. In addition, it is considered how to implement the designed zero-phased IIR filters. Finally, the proposed design method is demonstrated through various design examples.