Predistorter design for nonlinear high power amplifiers with multikernel adaptive filtering

Orthogonal frequency division multiplexing (OFDM) signals widely applied in digital wireless communication systems inevitably suffers from the distortion caused by high power amplifier (HPA) exhibiting output saturation characteristics. In this paper, kernel adaptive filtering is designed as the predistorter for separately compensating the nonlinearity of output amplitude and phase resulting in adjacent channel inference and degradation of the transmission performance. Simulation results show that the proposed predistorter based on kernel adaptive filtering can effectively reduce the influence of distortion of HPA in order to improve the bit error rate (BER) performance.