Optimal sharpening of compensated comb decimation filters: analysis and design
David Ernesto Troncoso Romero1, Massimiliano Laddomada2, Gordana Jovanovic Dolecek1
1Electronics Department, INAOE Institute, 72840 Tonantzintla, PUE, Mexico.
Thescientificworldjournal
|March 1, 2014
Summary
Sharpening compensated comb filters offers improved performance with lower complexity. This new method uses a simple compensator and optimization for better passband and selectivity, outperforming traditional techniques.
Area of Science:
- Digital Signal Processing
- Filter Design
Background:
- Comb filters are efficient for multistage decimation but suffer from passband droop and poor stopband attenuation.
- These limitations restrict their use in applications with strict magnitude response requirements.
Purpose of the Study:
- To introduce a low-complexity filtering scheme for compensated comb filters.
- To demonstrate improved performance in terms of passband distortion and selectivity.
Main Methods:
- Utilizing a simple three-addition compensator.
- Employing optimization-based derivation for sharpening polynomials.
- Comparing the proposed method against Kaiser-Hamming and Chebyshev sharpening techniques.
Main Results:
- Sharpening compensated comb filters requires lower-degree polynomials than uncompensated ones for stringent specifications.
- The proposed scheme achieves lower computational complexity.
- Design examples show significant improvements in passband flatness and selectivity.
Conclusions:
- The developed filtering scheme effectively addresses the limitations of traditional comb filters.
- This approach offers a computationally efficient solution for demanding filter applications.
- The method provides superior performance compared to existing sharpening techniques.
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