Power amplifier linearization methods and apparatus using predistortion in the frequency domain
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United States of America Patent
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Feb 26, 2008
Grant Date -
Jan 12, 2006
app pub date -
Jun 30, 2004
filing date -
Jun 30, 2004
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Abstract
To mitigate the effects of non-linear amplification in a digital transmission system employing a multi-carrier multiplexing communications technique, such as orthogonal frequency division multiplexing or discrete multi-tone, predistortion of an input signal to a power amplifier with a non-linear transfer characteristic is performed in the frequency domain by modifying frequency-domain symbols used to modulate individual sub-carriers. The frequency-domain symbols are modified in a manner that compensates for the amplifier's non-linear transfer characteristic.
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