High order inverse polynomial predistortion for memoryless RF power amplifiers

The digital predistortion (DPD) technique is widely used for compensation of the nonlinearity of RF power amplifiers (PAs). Nonlinearity and memory effect are two main considerations in predistortion designs. In some applications, there are advantages in using predistorters to linearize PAs before compensating for the memory effect. In this short paper, we present a polynomial predistortion method based on pth-order inverse method to compensate the memoryless nonlinearity of PAs. The coefficients of the polynomial predistorters up to the arbitrarily high orders can be identified directly from coefficients of the simple polynomial PA model up to arbitrarily high orders, which makes the compensation process much simpler than using complex algorithms computations. Furthermore, the proposed method can be adapted to the predistortion of PAs with memory effect, and can be implemented to field programmable gate arrays (FPGAs).