A digital predistortion technique based on non-uniform MP model and interpolated LUT for linearizing PAs with memory effects

Xiaowen Feng (1) , Bruno Feuvrie (1) , Anne-Sophie Descamps (1) , Yide Wang (1)

1 IETR - Institut d'Électronique et des Technologies du numéRique

A new digital predistortion (DPD) technique based on direct learning architecture is proposed for linearizing power amplifiers (PAs) with nonlinear memory effects. It is based on the non-uniform memory polynomial (MP) model and with quadratically interpolated LUT. Compared with the conventional MP model, the non-uniform MP model achieves the same modeling accuracy with less coefficients. Additionally, quadratically interpolated LUT is adopted to realize a part of mathematical computations in the predistortion. The proposed solution is validated on a real PA ZFL-2500. It reduces the number of model’s coefficients and achieves a spectrum regrowth suppression of about 15dB with table size of only 8.

Domaines: Traitement du signal et de l'image [eess.SP]

Xiaowen Feng, Bruno Feuvrie, Anne-Sophie Descamps, Yide Wang. A digital predistortion technique based on non-uniform MP model and interpolated LUT for linearizing PAs with memory effects. Electronics Letters, 2014, 50 (24), pp.1882-1884. ⟨10.1049/el.2014.2130⟩. ⟨hal-01079633⟩