Sharpening of non-recursive comb decimation structure

• Published in: 2013 13th International Symposium on Communications and Information Technologies (ISCIT) pp. 458 - 463
• Main Authors: Cruz Jimenez, Miriam Guadalupe, Calderon Reyes, Vanessa, Jovanovic Dolecek, Gordana
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2013
• Subjects: Attenuation; CIC filter; comb filter; Computational complexity; decimation; Finite impulse response filters; non-recursive structure; Passband; Polynomials; Power demand; sharpening; Transfer functions
• DOI: 10.1109/ISCIT.2013.6645902

This paper proposes the application of the improved sharpening technique to a non-recursive comb decimation filter, where the decimation factor M is a power of two. The goal is to improve simultaneously the Worst-Case Passband (WCP) and Worst-Case Attenuation (WCA). The coefficients of the sharpening polynomials are expressed as Sum of Power of Two (SPT), leading to a multiplierless structure with a non-significant increase of amount of Additions Per Output Sample (APOS). The resulting filter has a higher attenuation in its first folding band (where the worst-case attenuation occurs) and a droop-compensated passband. Included examples prove the efficiency of the method.