Digital Predistorter for Short-Wave Power Amplifier With Improving Index Accuracy of Lookup Table Based on FPGA

IEEE Access

Jijun Ren¹ 

[1] School of Communications and Information Engineering, Xi&x2019;

关键词: Short-wave;    power amplifier;    digital predistortion;    look-up table;    Taylor series;   

DOI  :  10.1109/ACCESS.2019.2960092

来源: DOAJ

【 摘 要 】

The method of function approximation to improve index accuracy of the lookup table (LUT) of digital predistortion (DPD) is proposed in this paper. The algorithm utilizes Taylor Series method for LUT approximation. The power value of a forward signal is divided into an integer and a decimal to index corresponding LUT respectively, and the indexed predistortion value of the forward signal is approached by fitting according to Taylor series, which makes the LUT index precision obviously increased. Experiment shows that comparing with the traditional Memory Polynomial Model (MPM) DPD LUT method, this model can improve Adjacent Channels Power Ratio (ACPR) over 15 dB for high frequency (HF) power amplifier's output signal, compensate for short-wave power amplifier nonlinear distortion effectively, and improve the short-wave radio communication quality greatly.

【 授权许可】

Unknown