Predistorsión digital de un amplificador clase J

Abstract

The efficient transmission and modeling of Orthogonal Frequency Division Multiplexing signals are difficult to address due to the special characteristics of this modulation scheme. This paper implements a memoryless digital predistorter based on a curve fitting procedure in order to linearize a highly efficient continuous mode class J power amplifier based on a 15 W GaN device at a frequency of 850 MHz. Measurements show that the compensation method obtains improvements up to 18.8 dB in ACPR and 14 dB in MER when combined with a PAPR reduction technique.