title: Optimal sharpening of compensated comb decimation filters: analysis and design.
abstract: Comb filters are a class of low-complexity filters especially useful for multistage decimation processes. However, the magnitude response of comb filters presents a droop in the passband region and low stopband attenuation, which is undesirable in many applications. In this work, it is shown that, for stringent magnitude specifications, sharpening compensated comb filters requires a lower-degree sharpening polynomial compared to sharpening comb filters without compensation, resulting in a solution with lower computational complexity. Using a simple three-addition compensator and an optimization-based derivation of sharpening polynomials, we introduce an effective low-complexity filtering scheme. Design examples are presented in order to show the performance improvement in terms of passband distortion and selectivity compared to other methods based on the traditional Kaiser-Hamming sharpening and the Chebyshev sharpening techniques recently introduced in the literature.
authors.affiliation: Electronics Department, INAOE Institute, 72840 Tonantzintla, PUE, Mexico.
authors.forename: David Ernesto
authors.initials: DE
authors.lastname: Troncoso Romero
authors.affiliation: Electrical Engineering Department, Texas A&M University, Texarkana, TX 75505, USA.
authors.forename: Massimiliano
authors.identifier: 0000-0003-3562-6161
authors.initials: M
authors.lastname: Laddomada
authors.affiliation: Electronics Department, INAOE Institute, 72840 Tonantzintla, PUE, Mexico.
authors.forename: Gordana
authors.identifier: 0000-0003-1258-5176
authors.initials: G
authors.lastname: Jovanovic Dolecek
mesh_terms: D004867:Equipment Design; D008962:Models, Theoretical; D013685:Telecommunications / Q000295:instrumentation* / Q000592:standards