One of the issues of power amplifier used in satellite communications is its nonlinearity. Digital predistortion is used in a linearizer to inverse this undesired effect to achieve higher efficiency to the amplifier. Xilinx provides a predistortion core to be implemented in FPGA devices. The core is used in a linearizer to test its functionality and performance. Simulation results indicate a gain of 11dB in reduction of spectrum regrowth in OFDM signal transmission. Hardware experiments reveal a 4dB gain can be obtained in practical application. Only a moderate resource of FPGA is needed to implement the digital predistortion core.

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