Design of compensators for comb-based filter classes
Gordana Jovanović Doleček, A. Fernandez-Vazquez, Biljana Stošić · Journal of Physics Conference Series · 2025
Abstract This paper presents the design of optimum wideband compensator filters to improve the passband of comb-based filter classes composed of the cascade of different lengths of comb filters. More specifically, we consider three classes of comb-based functions modified from the literature proposed to increase the aliasing attenuation of comb filters. However, those functions exhibit a high passband droop, which should be compensated to avoid the deformation of a decimated signal. The magnitude characteristic of the filter is in sinusoidal form. The design parameters are amplitudes of the sinusoidal functions obtained using MATLAB Particle Swarm Optimization (PSO). As a result, a minimum of the maximum passband deviation is achieved. The examples of the optimum compensator designs for all three comb-based filter classes are presented. As a result, the proposed decimation filter is less complex compared with the classical Remez-designed decimation filter.