Forward Modeling Assisted Digital Predistortion Based on Frequency-Sliced Sampling

In this paper, a novel forward modeling assisted digital predistortion method based on frequency sliced sampling (FMA-FSS-DPD) is proposed. The proposed method acquires multiple band-limited feedback signals with different local oscillations (LOs) and a band-limited filter, where the feedback bandwidth can be much less than the input signal. Then forward modeling is performed directly based on these feedback signals to extract the power amplifier (P A) model and recover complete PA output. Experimental results on a Doherty PA with lOOMHz OFDM signal validate that the proposed method has a comparable performance with traditional full-sampled DPD and the proposed method particularly suitable for ultra-wideband scenarios.