Comparison of lattice form based and direct form based complex adaptive notch filter

Abstract

In this paper we present a comparison of the tracking characteristics of Lattice based complex adaptive IIR notch filter (L-CANF) using new adaptive algorithm and Direct from based complex adaptive notch IIR notch filter (DCANF) using simplified gradient descent adaptive algorithm for different step size parameters. Three cases are investigated, i.e., linear chirp, quadratic chirp and randomly-hoping frequency input complex signals buried complex zero mean white Gaussian noise. Computer simulations shows the better tracking performance of L-CANF based on new adaptive algorithm over D-CANF based on simplified gradient descent algorithm.