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Paper's Title:
On Perturbed Reflection Coefficients
Author(s):
J. L. Díaz-Barrero and J. J. Egozcue
Applied Mathematics III,
Universidad Politécnica de Cataluña,
Barcelona, Spain
jose.luis.diaz@upc.edu
juan.jose.egozcue@upc.edu
Abstract:
Many control and signal processing applications require testing
stability of polynomials. Classical tests for locating zeros of
polynomials are recursive, but they must be stopped whenever the so
called "singular polynomials" appear. These ``singular cases'' are
often avoided by perturbing the "singular polynomial".
Perturbation techniques although always successful are not proven to
be well-founded. Our aim is to give a mathematical foundation to a
perturbation method in order to overcome "singular cases" when
using Levinson recursion as a testing method. The non-singular
polynomials are proven to be dense in the set of all polynomials
respect the L²-norm on the unit circle . The proof is
constructive and can be used algorithmically.
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