Modeling Accuracy of Wideband Power Amplifiers with Memory effects via Measurements

Abstract

In this paper, an accurate modeling approach to wideband Wi-Fi power amplifiers (PA) with memory effects is presented. Modeling accuracy is improved by interpolating the measured data from a low sampling rate of 40 MHz to high data rates with different interpolation factors based on the propagation delay of the actual PA. A memory polynomial (MP) model of the PA is able to characterize both nonlinear properties and memory effects of the actual PA; especially for wide bandwidth Wi-Fi OFDM signal transmission. With this improved MP model of the PA, another similar memory polynomial model for the predistorter (PD) is developed to linearize wideband WiFi PAs.