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Effects of power amplifier memory on adaptive feedforward linearizers | IEEE Conference Publication | IEEE Xplore

Effects of power amplifier memory on adaptive feedforward linearizers


Abstract:

Feedforward linearization is one of the most well-known and widely-applied methods for linearizing power amplifiers (PA). In order to prevent performance degradation due ...Show More

Abstract:

Feedforward linearization is one of the most well-known and widely-applied methods for linearizing power amplifiers (PA). In order to prevent performance degradation due to implementation inaccuracies, adaptive or self-designing structures utilizing e.g. gradient-descent type methods have been developed. Although the basic feedforward structure as such is insensitive to PA memory, the effects of memory on the adaptation behavior can be significant. In this paper, we present an analysis on the convergence of feedforward linearizer coefficients and the resulting reduction of inter-modulation distortion (IMD) when gradient-descent type adaptations are used with a PA that exhibits memory. A Hammerstein model is used for PA modeling, and computer simulations are used to demonstrate the validity and accuracy of the analysis.
Date of Conference: 21-24 October 2008
Date Added to IEEE Xplore: 30 December 2008
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Conference Location: Reykjavik, Iceland

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