Recursive Pre-Distorter for Hardware Efficient Digital Pre-Distortion

In this paper, a novel recursive pre-distorter design to minimize the hardware requirements for digital pre-distortion is proposed. The proposed structure is modular and can be adapted easily to implement subset, reduced or regularised digital pre-distortion functions. For MIMO systems, in which each transmission element requires linearisation and each pre-distortion function can differ, the hardware efficiency and flexibility provided by the proposed pre-distorter is hugely beneficial. Compared to Horner's method the novel method enables a 62% reduction in the hardware resources required to implement a 5th order, 2 memory tap Volterra pre-distortion function.