Abstract :
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A new monotonic companding function is proposed for non-uniform
lookup table (LUT) indexation employed in digital predistortion
(PD) of Radio Frequency (RF) power amplifiers (PA) under wide band
signals. This function, designed to be robust to the input signal
statistics variations, overcomes the disadvantages of optimal
indexation which depends on the input back-off (IBO) operation
point of the PA. Simulation results show the robustness of the
proposed companding function to IBO variations, comparing with
conventional LUT indexing techniques, namely power, amplitude and
optimal.
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