Digital emulation of non-linear and linear distortions caused by Analog/RF devices involved in wireless transmissions.

Background:
By nature, Analog/RF devices are not perfect and show both non-linear distortions in time domain (amplitude and phase of output signal are not exactly following amplitude and phase of input signal) and linear distortions in frequency domain (amplitude and phase frequency response is not perfect).

Such imperfect characteristics constitute a limiting factor to wireless digital transmission systems performances. However, the influence and acceptable limits for those distortion effects are quite difficult to quantify in practise since real Analog/RF devices characteristics cannot simply be tuned on demand for such test purposes.

This is why a digital system capable of emulating and generating adjustable/calibrated distortion effects is of prime interest to quantify digital transmission systems requirements in terms of Analog/RF devices performances and quality.