DPD:Target Gain Type Property

The DPD polynomial or lookup table is computed by assuming that the linearized gain expected from the DUT after applying DPD on the input waveform is equal to the average power gain provided by the DUT without DPD.

The DPD polynomial or lookup table is computed by assuming that the linearized gain expected from the DUT after applying DPD on the input waveform is equal to the gain provided by the DUT, without DPD, to the parts of the reference waveform that do not drive the DUT into non-linear gain-expansion or compression regions of its input-output characteristics.

The measurement computes the linear region gain as the average gain experienced by the parts of the reference waveform that are below a threshold which is computed as shown in the following equation:

Linear region threshold (dBm) = Max {-25, Min {reference waveform power} + 6, DUT Average Input Power -15}

The DPD polynomial or lookup table is computed by assuming that the linearized gain expected from the DUT after applying DPD on the input waveform is equal to the average power gain provided by the DUT, without DPD, to all the samples of the reference waveform for which the magnitude is greater than the peak power in the reference waveform (dBm) - 0.5dB.