Linearization device for a power amplifier
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jan 12, 2012
app pub date -
Dec 22, 2010
filing date -
Dec 23, 2009
priority date (Note) -
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Abstract
A linearization device for a power amplifier using adaptive digital baseband predistortion includes a pre-inverse block receiving a complex discretized input signal {tilde over (x)}e(n) and restoring a complex predistorted signal {tilde over (x)}p(n) at the power amplifier input. The pre-inverse block includes a first module and a second module receiving the modulus of the complex input signal |{tilde over (x)}e(n)| at the input whose value is included in an amplitude domain varying between two values 0 and Amax, the amplitude domain being split into a plurality of segments, the first module associating with each value of the complex input signal modulus |{tilde over (x)}e(n)| contained in a given segment, a set of several parameters defining a model implemented in the second module via a function Fj, the second module restoring a value Fj(|{tilde over (x)}e(n)|), the complex predistorted signal resulting from multiplying the complex input signal {tilde over (x)}e (n) by the value Fj(|{tilde over (x)}e(n)|).
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