/// <summary>Configures common settings for memory polynomial based DPD.</summary>
/// <param name="specAn">Specifies the SpecAn signal to configure.</param>
/// <param name="mpConfig">Specifies the memory polynomial settings to apply.</param>
/// <param name="selectorString">Pass an empty string. The signal name that is passed when creating the signal configuration is used.
/// See the RFmx help for more documention of this parameter.</param>
public static void ConfigureMemoryPolynomial(RFmxSpecAnMX specAn, MemoryPolynomialConfiguration mpConfig, string selectorString = "")
{
specAn.Dpd.Configuration.ConfigureDpdModel(selectorString, RFmxSpecAnMXDpdModel.GeneralizedMemoryPolynomial);
specAn.Dpd.Configuration.ConfigureMemoryPolynomial(selectorString, mpConfig.Order, mpConfig.Depth);
specAn.Dpd.Configuration.ConfigureGeneralizedMemoryPolynomialCrossTerms(selectorString, mpConfig.LeadOrder,
mpConfig.LagOrder, mpConfig.LeadMemoryDepth, mpConfig.LagMemoryDepth, mpConfig.MaximumLead, mpConfig.MaximumLag);
RFmxSpecAnMXDpdIterativeDpdEnabled iterativeDpdEnabled = mpConfig.NumberOfIterations > 1 ? RFmxSpecAnMXDpdIterativeDpdEnabled.True : RFmxSpecAnMXDpdIterativeDpdEnabled.False;
specAn.Dpd.Configuration.ConfigureIterativeDpdEnabled(selectorString, iterativeDpdEnabled);
specAn.Dpd.ApplyDpd.ConfigureMemoryModelCorrectionType(selectorString, mpConfig.CorrectionType);
}
/// <summary>Acquires the incoming signal, trains the DPD model, applies the memory polynomial to the reference waveform, and downloads the predistorted waveform to the generator.
/// If generation is in progress when this function is called, generation will resume with the predistorted waveform.</summary>
/// <param name="specAn">Specifies the SpecAn signal to configure.</param>
/// <param name="rfsgSession">Specifies the open RFSG session to configure.</param>
/// <param name="referenceWaveform">Specifies the <see cref="Waveform"/> whose data defines the complex baseband equivalent of the RF signal applied at the input
/// port of the device under test when performing the measurement. See the RFmx help for more documention of this parameter.</param>
/// <param name="selectorString">Pass an empty string. The signal name that is passed when creating the signal configuration is used.
/// See the RFmx help for more documention of this parameter.</param>
/// <returns>Common results after the application of memory polynomial based DPD.</returns>
public static MemoryPolynomialResults PerformMemoryPolynomial(RFmxSpecAnMX specAn, NIRfsg rfsgSession, MemoryPolynomialConfiguration mpConfig,
Waveform referenceWaveform, string selectorString = "")
{
//Instantiate new waveform with reference waveform properties
MemoryPolynomialResults mpResults = new MemoryPolynomialResults()
{
PredistortedWaveform = referenceWaveform
};
mpResults.PredistortedWaveform.Data = referenceWaveform.Data.Clone(); // clone waveform so RFmx can't act on reference waveform
mpResults.PredistortedWaveform.UpdateNameAndScript(referenceWaveform.Name + "postMpDpd");
RFmxSpecAnMXDpdApplyDpdIdleDurationPresent idlePresent = referenceWaveform.IdleDurationPresent ? RFmxSpecAnMXDpdApplyDpdIdleDurationPresent.True : RFmxSpecAnMXDpdApplyDpdIdleDurationPresent.False;
RfsgGenerationStatus preDpdGenerationStatus = rfsgSession.CheckGenerationStatus();
rfsgSession.Abort(); // abort so we don't mess with the loop logic
for (int i = 0; i < mpConfig.NumberOfIterations; i++)
{
specAn.Dpd.Configuration.ConfigurePreviousDpdPolynomial(selectorString, mpResults.Polynomial);
rfsgSession.Initiate();
specAn.Initiate(selectorString, "");
specAn.WaitForMeasurementComplete(selectorString, 10.0); // wait for polynomial coefficients to be calculated
//waveform data and PAPR are overwritten in post DPD waveform
specAn.Dpd.ApplyDpd.ApplyDigitalPredistortion(selectorString, referenceWaveform.Data, idlePresent, 10.0, ref mpResults.PredistortedWaveform.Data,
out mpResults.PowerResults.WaveformTruePapr_dB, out mpResults.PowerResults.WaveformPowerOffset_dB);
//Waveform's PAPR is modified to adjust the output power of the waveform on a per waveform basis rather than changing the
//user's configured output power on the instrument
mpResults.PredistortedWaveform.PAPR_dB = mpResults.PowerResults.WaveformPowerOffset_dB + mpResults.PowerResults.WaveformTruePapr_dB;
DownloadWaveform(rfsgSession, mpResults.PredistortedWaveform); // implicit abort
ApplyWaveformAttributes(rfsgSession, mpResults.PredistortedWaveform);
specAn.Dpd.Results.FetchDpdPolynomial(selectorString, 10.0, ref mpResults.Polynomial);
}
mpResults.PowerResults.TrainingPower_dBm = rfsgSession.RF.PowerLevel;
if (preDpdGenerationStatus == RfsgGenerationStatus.InProgress)
{
rfsgSession.Initiate(); // restart generation if it was running on function call
}
return(mpResults);
}
