A Novel Multi-Band Look-Up Table Based Digital Predistorter with a Single Common Feedback Loop

This paper proposes a novel adaptive multi-band look-up table (LUT)-based digital predistorter (DPD) with a single common feedback loop for concurrent multi-band power amplifiers (PAs). The proposed DPD reduces the total complexity to one-hundredth by implementing a LUT-based DPD model and updating the DPD coefficients using the reciprocal operation of each PA model coefficient. Simulation results for LTE-based systems show that the proposed low complexity DPD can achieve 50 dB adjacent channel leakage ratio (ACLR) level, which completely satisfies the 3GPP standard.