Performance Investigation of Volterra-based Digital Predistortion Using Orthogonal Matching Pursuit

The inherent memory nonlinearity of power amplifier (PA) has restricted the improvement of system performance in wireless communications. However, the Volterra series (VS) based digital predistorter (DPD) can compensate the nonlinear distortion of PA. In this paper, the orthogonal matching pursuit (OMP) approach is employed to identify the VS kernels, and the corresponding system performance of VS-DPD is investigated. Furthermore, the realization process of the OMP algorithm is theoretically analyzed, and the VS-DPD system is simulated and verified by MATLAB software. Finally, the simulation results show that the proposed scheme exhibits better coefficients identification performance than some traditional methods, and the memory nonlinearity of PA can be mitigated efficiently.