Digital Predistortion for Nonlinear RF Power Amplifiers in Wideband Communication Systems

Abstract

This thesis provides a comprehensive study of linearity enhancement in Radio Frequency (RF) Power Amplifiers (PA) while transmitting wideband signals with a high Peak Average Power Ratio (PAPR). With the advancement of digital modulation techniques, signals with a highly variable envelope create challenges for the linearity of a transmitter's exciter electronics. The main focus of this work is on modeling existing Power Amplifier designs and improving their linearity to accommodate these advanced modulation techniques without violating spectrum emission requirements. A key aspect of this research involves the development and implementation of a memory polynomial pre-distortion method for the mitigation of memoryless nonlinearity, which is demonstrated to be effective through computational simulations and hardware implementation. The thesis also acknowledges existing challenges in addressing memory distortion, as it identifies specific areas where current methodologies fall short, underscoring the potential for continued research and innovation in this domain. Overall, this research holds significant implications for improving power efficiency and spectral efficiency in RF communication systems, which ultimately contributes to the advancement of wireless transmission technologies.