放大器估计器的查表法自适应预失真器设计

非线性功放特性随温度，供电电压等因素的变化而改变，为保证其稳定工作，预失 真系统的自适应性能就显得非常重要。当前的自适应预失真算法每次都对其参数进行更新， 计算量很大。针对这个问题提出了一种放大估计器的查表法自适应预失真算法，将查表法和 放大器估计器法结合在一起，以误码率为指标在系统允许的误差范围内可以大大减少参数的 迭代次数。同时针对不同的输入回退，可以选择采用不同的预失真算法，从而使其更加接近 功放特性，进一步减少迭代次数。

A New Adaptive Predistorter Based on Estimator and LUT

The characteristics of non linear amplifier change with temperature and supply voltage.In order to ensure stability of amplifier, the adaptive predist ortion becomes very important.To solve the problem of large compulation of exist ing adaptive predistortion algorithms,a new digital adaptive pre distorter is designed in this paper. Combining estimator and look up table meth od(LUT ),and also by setting bit error rate(BER) as an indicator, the iteration times c an be significantly r educed when BER is lower than the standard one. At the same time, for different i nput back off (IBO), different predistortion algorithms can be chosen, so the s ystem can get better result and iteration times can be further reduced.