The Influence of Look-Up Table Setting and Interpolation Algorithm on Power Amplifier Behavioural Modeling

Digital predistortion (DPD) is a major technique for linearizing power amplifier (PA). This paper investigates the influence of look-up table (LUT) setting and interpolation algorithm on PA behavioural modeling. It is found that nonlinear interpolation has a higher accuracy than linear interpolation in principle, but its modeling has a lower accuracy than the linear interpolation when LUT size is small enough.