A FAST ALGORITHM FOR DIGITAL PRE-DISTORTION OF NONLINEAR POWER AMPLIFIERS (MonPmPO2)

Author(s) : Ernst Aschbacher (Vienna University of Technology, Austria) Holger Arthaber (Vienna University of Technology, Austria) Markus Rupp (Vienna University of Technology, Austria)

Abstract : A fast iterative algorithm for pre-equalisation of a nonlinear dynamic (with memory) system is presented . The algorithm is based on the secant method for root-finding. Within a few iterations the nonlinear and dynamic effects of the system, modeled, e.g., with a Volterra or Wiener model, can be compensated very well. The algorithm is then used to linearise a nonlinear power amplifier, modeled as a Wiener system. Measurement results prove the excellent performance of the presented method.

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