VIOMAP, 16QAM and Spectral Regrowth: Enhanced Prediction and Predistortion based on Two-Tone Black-Box Model Extraction

Modeling a nonlinear device, based on measurements at the carrier frequency only, it is possible to predict its response to narrow-band signals like 16QAM. Using an inverse of this model to predistort the IQ signal may result in poor reduction of spectral regrowth due to unmodeled subtle side-effects. Based on two-tone measurements a better model can be extracted enhancing both the prediction and the reduction of spectral regrowth. This article focuses on the achieved results. An extended version does exist which also highlights some theoretical aspects.