Simplified sampling method and system to characterize nonlinear system with memory

摘要

PURPOSE: A simplified sampling method and system to characterize a nonlinear system with a memory are provided to improve realistic commerciality possibility by relieving hardware restriction conditions. CONSTITUTION: A frequency converter(200) is located at an input and output shaft of a nonlinear element. An I(In-phase) component and a Q(Quadrature) component are extracted from the signal at the input and output shaft. A digital converter(203) samples the extracted I and Q component by a frequency less than twice bandwidth of the signal and converts it to a digital signal. A nonlinear modeling unit(204) extracts the size distortion and phase distortion by using the I component and Q component.