Frequency-Dependent DPD Linearization for Load-Mismatched Mobile Terminal PAs Operating Under Dynamic Resource Block Allocation

This paper presents a novel linearization method to compensate for load-mismatched power amplifiers in 5G new radio mobile terminals. The proposed digital predistortion (DPD) approach is based on a frequency-dependent memoryless polynomial behavioral model that allows meeting the linearity specifications under dynamic resource block (RB) allocation when considering narrowband signals. The advantage of the proposed frequency-dependent method is experimentally validated by comparing it with a classical DPD approach where the coefficients are trained only for a specific RB location.