An avoidance of premature convergence in IIR filter design using PSO

In this paper, a design method for the Infinite Impulse Response (IIR) filter using the Particle Swarm Optimization (PSO) is developed. Because the PSO has a strong directivity toward a local minimum, the PSO updating tends to stagnate around such a local minimum and thus indicates a premature convergence. Recently, the Asynchronous Digenetic PSO with Nonlinear dissipative term (N-AD-PSO) has been proposed for a diverse search. It can be expected that the stagnation can be avoided by the N-AD-PSO. In this study, the N-AD-PSO is adapted for the IIR filter design. Several examples are shown to present the effectiveness of the proposed method.