Combination of Digital Second-Order Linearization Technique and DPD Compensation Technique - Concept and Results

In this paper, a single stage broadband power amplifier operating at 3.5 GHz central frequency is linearized in simulation by the technique that combines two linearization approaches: 1. the digital technique that uses the second-order baseband nonlinear signals which modulate the second harmonic of signal carrier and 2. one iteration of the DPD Compensation technique. Linearization results are obtained and analyzed for 5G signal modulation forms FBMC, FOFDM, and UFMS with 50 MHz useful channel bandwidth for various signal power levels. The output spectrum achieved by the combined technique is compared for the cases when two linearization techniques are applied independently.