A new adaptive predistorter based on estimator and LUT

Abstract

The adaptive predistortion is an effective technique to correct the error caused by the nonlinearity of high-power amplifier (HPA). This paper proposes a novel method to construct the adaptive predistorter which combines the estimator and look-up table (LUT) together. The property of the adaptive predistorters depends on the update frequency and algorithm. By setting bit error rate (BER) as an update indicator, update frequency of the new predistorter become significantly low. The update scheme begins when the BER is lower than the standard BER. In the new method, different predistortion algorithms can be chosen according to different input back-off (IBO). Therefore, the calculation amount can be reduced.