A High Performance Complexity Reduced Behavioral Model and Digital Predistorter for MIMO Systems With Crosstalk
In this paper, an augmented crossover memory polynomial model (A COMPM) is proposed and developed which can be used for characterizing and linearizing multiple input multiple output (MIMO) transmitters in the presence of linear and nonlinear crosstalk. The proposed model significantly improves the performance of the crossover memory polynomial model (CO MPM) by more accurately incorporating the effect of crosstalk. The proposed model performs comparably to the 2 x 2 parallel Hammerstein (2 x 2 PH) model, while requiring the same number of coefficients as CO MPM and a lower number of coefficients than the 2 x 2 PH. The model was tested for forward modeling and digital predistortion (DPD) applications in the presence of both linear and nonlinear crosstalk. Experimental results show that the model outperforms the CO MPM and 2 x 2 PH DPDs, at a lower number of coefficients compared to both models. Furthermore, the issue of numerical stability of the DPD
IEEE Transactions on Communications