OFDM系统中记忆非线性放大器的高效预失真技术

为了解决宽带正交频分复用系统中功率放大器频率选择非线性失真问题，在Jardin等提出的Filter Look-Up Table(FLUT)结构基础上提出一种新的双预失真器结构．在FLUT结构基础上增加一个频域预失真器，同时利用二维查表预失真器更精确地弥补了功率放大器频率选择非线性失真对信号造成的影响．仿真结果表明，新结构在提高系统性能和收敛精度的同时，可以提高收敛速度50％左右．

Filter lookup table with a frequency predistorter structure for the memory nonlinear power amplifier in the OFDM system

A new structure based on the Filter Look-Up Table(FLUT) structure is proposed for solving the problem of frequency-selective nonlinear distortion of the power amplifier in a wideband OFDM system. A new predistorter which uses the 2-dimensional Look-Up Table method is added in the frequency domain to compensate the distortion more accurately. Simulation result indicates that the system performance and the accuracy of convergence can be improved, and that the rate of convergence can be increased by 50％ compared to the original FLUT structure.