Abstract: The inherent nonlinearity of radio frequency power amplifiers ( RF PAs) is one of the key problems of the wireless communication system front-end designing. This paper proposes a digital predistorter according to the GAH nonlinear model for radio frequency power amplifiers. And the implementation method is given in this paper. Moreover, in order to analyze the performances of the GAH predistorter accurately, the actual input and output data of the RF PA is employed for the simulation and experiments. The RF PA under the test is a Doherty RF PA operating at 1960 MHz with 40 MHz bandwidth and 45 dBm power out. The simulation and experiment results show that the linearization capability of the proposed digital predistorter is stronger than the AH, memory polynomial and fractional memory polynomial predistorters with much less computational complexity.