A Note on Argument Principle
Corneliu Rusu, Jaakko T. Astola · IEEE Signal Processing Letters · 2004
The goal of this work is to show how the argument principle together with discrete Fourier transform (DFT) can be used to determine some properties of finite-length complex-valued sequences, precisely the localization of zeros with respect to unit circle of their related Z-transform. An upper bound of the DFT (in one step) length to exactly calculate the increase of the argument is also provided.