Base station digital predistortion compensating for frequency-dependent IMD components

This paper presents an overview of a digital predistorter (DPD) that compensates for frequency-dependent intermodulation distortion (IMD) components in cellular base stations. The DPD is based on a power-series model. It has a distortion generation path and incorporates a frequency characteristics compensator that compensates for frequency-dependent IMD components. Experimental results show that the DPD compensates for the frequency-dependent IMD components and improves the drain efficiency of the power amplifier. This research shows that digital signal processing techniques improve the performance of the base station transmitter.