Computer-aided nonlinear simulation at the system level

A computer-aided technique (the discrete technique) for nonlinear simulation at the system level is presented in this paper. The basis of the discrete technique is representation of the equivalent block diagram of a system or subsystem as linear filters and memoryless nonlinear elements. Linear filters are simulated in the frequency domain; nonlinear memoryless elements are simulated in the time domain; the transition from the time domain to the frequency domain and vise versa is made with the use of the fast Fourier transform. The methods of high-order polynomial synthesis, an automatic identification of nonlinear interference sources as well as detector simulation have also been discussed