Mixed Dual Band Digital Predistortion Model Based on DDR

Due to the development of the multi standard communication system, digital predistortion linearization technology for concurrent dual band power amplifier has attracted a lot of attention in recent years. This paper proposes a mixed dual band digital predistortion model based on DDR, which extends the traditional DDR model to synchronic dual band mode, with the introduction of two dimensional memory polynomial model with same order envelope cross term, to enhance the compensation ability for the nonlinear intermodulation distortion in the dual band power amplifier, which can achieve better modeling precision and linearization performance than the simplified two-dimensional memory polynomial model and the traditional DDR model, while at the same time maintain the advantages easy to realize by using the one-dimensional lookup table. Experiments show that the New Model has good level in both performance and complexity.