Inverse Modeling Estimation Algorithm for Multi-Carrier High Power Amplifiers

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  • Author: Mohamed K. Nezami, Ph.D.
Many predistor-tion schemes use a memory-less approach [1, 2], but with broadband systems, where the bandwidth is typically larger than five MHz, the PA typically can no longer be considered a memory-less system. With this, the inverse transfer func-tion of the PA—which describes the forward transfer function of the required pre-distorter function—can no longer be obtained using memory-less approaches. The reason for this is that, for any given input envelope value, there are an infinite number of possible values for the inverse function.