Digital Predistortion Implemented in Software Defined Radios

Digital predistortion (DPD) is recognized as an effective solution for power amplifier (PA) linearization. The DPD provides conformity of wireless infrastructure to telecommunication standard requirements (regarding bit error rate (BER), transmit spectrum mask (TSM), error vector magnitude (EVM) …) by making PA more linear, while at the same time reduces the running cost of the telecommunication infrastructure. Different PA models were used for simulation of DPD algorithm: Memoryless, Complex Valued Memory Polynomial model, Hammerstein and Wiener. The simulations results are provided in the paper as well the measured results obtained by Class-J GaN HEMPT amplifier linearization.