Design of excitation signals for nonparametric measurements on MIMO-systems in the presence of nonlinear distortions

In this paper we make nonparametric measurements on a system with two inputs and two outputs, in the presence of nonlinear distortions. Starting from a series of experiments, the frequency response function, the covariance matrix of the output noise, and the covariance matrix of the output nonlinear distortions are estimated as a function of the frequency. It will be shown that, using well designed periodic excitations signals, it is possible to obtain these results with little user interaction, making the method accessible for non-experienced users.