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 functi<strong>on</strong> F{x} is indexed by the instantaneous input amplitude. The LUT entry for<br />
the corresp<strong>on</strong>ding input vector’s amplitude is then multiplied by the input signal vector. The updates<br />
to the predistorter LUT are c<strong>on</strong>tinually adjusted by comparing the reference complex envelope Vm(t)<br />
with the sampled feedback modulati<strong>on</strong> Va(t). The resultant loop error vector is then separated into a<br />
scaling and rotati<strong>on</strong> error comp<strong>on</strong>ent. For all inputs to the amplifier <strong>of</strong> identical instantaneous signal<br />
amplitude, the scaling and rotati<strong>on</strong> errors will be identical.<br />
<strong>Digital</strong> Predistorti<strong>on</strong> - 14
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