Title :
Digital predistortion technique based on non-uniform MP model and interpolated LUT for linearising PAs with memory effects
Author :
Xiaowen Feng ; Feuvrie, B. ; Descamps, Anne-sophie ; Yide Wang
Author_Institution :
IETR, Ecole Polytech. de l´Univ. de Nantes, Nantes, France
Abstract :
A new digital predistortion technique based on a direct learning architecture is proposed for linearising power amplifiers (PAs) with nonlinear memory effects. It is based on the non-uniform memory polynomial (MP) model and with a quadratically interpolated LUT. There are mainly two innovations. First, compared with the conventional MP model, the non-uniform MP model achieves the same modelling accuracy with less coefficients. Secondly, compared with the linearly interpolated LUT, the quadratically interpolated LUT has higher accuracy, which is adopted to realise a part of the mathematical computations in the predistortion. The proposed solution is validated on a real PA ZFL-2500. It reduces the number of the model´s coefficients and achieves a spectrum regrowth suppression of about 15 dB with a table size of only 8.
Keywords :
interpolation; linearisation techniques; polynomials; power amplifiers; DPD technique; PA linearization; digital predistortion technique; linear interpolated LUT; nonlinear memory effects; nonuniform MP model; nonuniform memory polynomial model; power amplifiers; quadratic interpolated LUT; real PA ZFL-2500; spectrum regrowth suppression;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2014.2130