Complex Cascade Digital Filters

Complex filters are filters that process two signals often denoted the real and imaginary signal components. This publication deals with how to realize digital complex filters using cascade architectures. A number of design techniques to improve numerical inaccuracies are presented. The design algorithms have been implemented using Matlab; methods to overcome Matlab limitations when manipulating complex systems are described. A number of examples are presented. The sensitivities of the filter realizations are investigated using Monte Carlo analysis.