Identification of rate saturation from best linear approximation

This paper considers the identification of rate saturation nonlinearity. A method to estimate the rate saturation limits from the best linear approximation is proposed and applied to the model in discrete-time. The approach has the advantages that it can be easily extended to the identification of Wiener-Hammerstein models whereby the rate saturation block is cascaded in a Wiener-Hammerstein structure and identification can also be carried out across the frequency bandwidth of interest. Simulation results are presented to show the effectiveness of the proposed technique.