Presentation on Digital Predistortion of Power Amplifiers - Agilent ...
Presentation on Digital Predistortion of Power Amplifiers - Agilent ...
Presentation on Digital Predistortion of Power Amplifiers - Agilent ...
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The complex gain Look-up Table technique [4] adapts the table entries to achieve the inverse<br />
AM/AM and AM/PM characteristics from that <strong>of</strong> the power amplifier. The LUT is indexed by the<br />
instantaneous amplitude <strong>of</strong> the input signal. If the power amplifier n<strong>on</strong>linearity is well behaved at<br />
lower power levels then the LUT can be indexed by the square <strong>of</strong> the input amplitude. In this case as<br />
little as 64 table entries have been dem<strong>on</strong>strated to provide sufficient spectral c<strong>on</strong>trol. A particular<br />
advantage <strong>of</strong> this approach is that the complex gain functi<strong>on</strong> can adapt very quickly to channel<br />
changes because <strong>of</strong> the reduced number <strong>of</strong> LUT entries that need to be adjusted.<br />
<strong>Digital</strong> Predistorti<strong>on</strong> - 13
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