Browsing by Author "Vargas, Ricardo"

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    Adaptive Iterative Reqeighted Least Squares Design of LP FIR Filters
    (IEEE, 1999-03-01) Vargas, Ricardo; Burrus, C. Sidney; Digital Signal Processing (http://dsp.rice.edu/)
    This paper presents an efficient adaptive algorithm for designing FIR digital filters that are efficient according to an Lp error criteria. The algorithm is an extension of Burrus' iterative reweighted least-squares (IRLS) method for approximating Lp filters. Such algorithm will converge for most significant cases in a few iterations. In some cases however, the transition bandwidth is such that the number of iterations increases significantly. The proposed algorithm controls such problem and drastically reduces the number of iterations required.
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    On the Design of LP IIR Filters with Arbitrary Frequency Response
    (IEEE, 2001-05-01) Vargas, Ricardo; Burrus, C. Sidney; Digital Signal Processing (http://dsp.rice.edu/)
    This paper introduces an iterative algorithm for designing IIR digital filters that minimize a complex approximation error in an Lp sense. The algorithm combines ideas that have proven successful in the similar problem of Lp FIR filter design. We use iterative prefiltering techniques common in applications such as parameter estimation together with an Iterative Reweighted Least Squares (IRLS) method. The result is a double iterative approach that generates IIR filters of arbitrary magnitude and phase response and arbitrary numerator and denominator orders. Such filters can be used in a variety of applications in which the typical L2 or Minimax error criteria might not be suitable.