Adaptive digital pre-distortion using amplifier model that incorporates frequency-dependent non-linearities
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United States of America Patent
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Oct 5, 2004
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N/A
app pub date -
Sep 17, 2002
filing date -
Apr 3, 2002
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Expired
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Abstract
A pre-distorter pre-distorts an input signal prior to being applied to an amplifier in order to reduce spurious emissions in the resulting amplified signal. The pre-distorter implements an inverted version of a model of the amplifier that models both the frequency independent (FI) characteristics of the amplifier as well as the frequency-independent (FD) characteristics of the amplifier. Techniques and architectures are presented for (1) generating and updating the model, (2) inverting the model, and (3) updating the inverted model.
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