A digital predistortion method based on nonuniform memory polynomial model using interpolated LUT

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

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

This paper presents a baseband Digital PreDistortion (DPD) method for Power Amplifier (PA) linearization. It is based on the nonuniform Memory Polynomial (MP) model with direct learning architecture. The interpolated Look-Up Table (LUT) is adopted in the predistorter, to replace a part of the computational operations. The complex predistorted signal is calculated by two parts: one is the amplitude of the predistorted signal which is obtained by a linear-interpolation LUT; the other is the phase of the predistorted signal which is obtained by a quadratic-interpolation LUT. The proposed method makes a good tradeoff between the computational complexity, table size and linearization performance. It is validated on a test bench using a PA ZFL-2500 driven by a 64QAM modulated signal.

Mots clés: look-up table; nonuniform memory polynomial; digital predistortion; power amplifier

Domaines: Sciences de l'ingénieur [physics]

Xiaowen Feng, Bruno Feuvrie, Anne-Sophie Descamps, Yide Wang. A digital predistortion method based on nonuniform memory polynomial model using interpolated LUT. IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR2015), Jan 2015, San Diego, CA, United States. paper#167, ⟨10.1109/pawr.2015.7139201⟩. ⟨hal-01070353⟩