Optimization Design of Memory Polynomial Coefficient Look-Up Table Predistorter Algorithm

In communication system, the nonlinear distortion influence of high power amplifier (HPA) can be corrected by digital baseband predistorter technology effectively. The memory polynomial algorithm and the look-up table (LUT) algorithm are two commonly used predistorter algorithms. But memory polynomial algorithm´s linearization is insufficient in the amplifier saturation region and LUT algorithm has quantification distortion. Aiming at these problems, we propose the memory polynomial coefficient LUT predistorter algorithm, and use order reduction and amplitude division methods for further improvement. Simulation results show that new algorithm can improve out-of-band power spectral density by 23dB and reduce both computation complexity and LUT size. So this new algorithm has a promising practical value.