public static TxPServoResults TxPServoPower(RFmxWlanMX wlanSignal, NIRfsg rfsgSession, TxPServoConfiguration servoConfig,
AutoLevelConfiguration autoLevelConfig, string selectorString = "")
{
//Duplicate the existing configuration so that we can select only TxP for the power servo to save time,
//but not disrupt all of the other user enabled measurements.
wlanSignal.CloneSignalConfiguration("servo_txp", out RFmxWlanMX servoTxpSession);
servoTxpSession.SelectMeasurements(selectorString, RFmxWlanMXMeasurementTypes.Txp, false);
double[] servoTrace = new double[servoConfig.MaxNumberOfIterations];
double powerLevel = 0, outputPower = 0, margin = 0;
bool servoSucess = false;
for (int i = 0; i < servoConfig.MaxNumberOfIterations; i++)
{
if (autoLevelConfig.Enabled)
{
servoTxpSession.AutoLevel(selectorString, autoLevelConfig.MeasurementInterval_s);
}
servoTxpSession.Initiate(selectorString, "");
powerLevel = rfsgSession.RF.PowerLevel;
servoTxpSession.Txp.Results.FetchMeasurement(selectorString, 10, out outputPower, out _);
margin = servoConfig.TargetTxPPower_dBm - outputPower;
servoTrace[i] = outputPower;
if (Math.Abs(margin) <= servoConfig.Tolerance_dBm) //Servo complete; exit the loop
{
servoSucess = true;
break;
}
else //Still more room to go
{
rfsgSession.RF.PowerLevel = powerLevel + margin;
rfsgSession.Utility.WaitUntilSettled(1000);
}
}
//If we auto-leveled we need to set the original configuration to the newly calculated ref level
servoTxpSession.GetReferenceLevel(selectorString, out double newRefLevel);
wlanSignal.ConfigureReferenceLevel(selectorString, newRefLevel);
servoTxpSession.Dispose();
TxPServoResults servoResults = new TxPServoResults();
servoResults.FinalInputPower_dBm = powerLevel;
servoResults.FinalOutputPower_dBm = outputPower;
servoResults.ServoTrace = servoTrace;
if (!servoSucess)
{
throw new System.TimeoutException("WLAN TxP Power Servo exceeded max iterations without success.");
}
return(servoResults);
}
static void Main()
{
#region Configure Generation
string resourceName = "VST2";
string filePath = Path.GetFullPath(@"Support Files\80211a_20M_48Mbps.tdms");
NIRfsg nIRfsg = new NIRfsg(resourceName, false, false);
InstrumentConfiguration instrConfig = InstrumentConfiguration.GetDefault();
instrConfig.CarrierFrequency_Hz = 2.412e9;
ConfigureInstrument(nIRfsg, instrConfig);
Waveform waveform = LoadWaveformFromTDMS(filePath);
DownloadWaveform(nIRfsg, waveform);
WaveformTimingConfiguration timing = new WaveformTimingConfiguration
{
DutyCycle_Percent = 60,
PreBurstTime_s = 1e-9,
PostBurstTime_s = 1e-9,
BurstStartTriggerExport = "PXI_Trig0"
};
PAENConfiguration paenConfig = new PAENConfiguration
{
PAEnableMode = PAENMode.Dynamic,
PAEnableTriggerExportTerminal = "PFI0",
PAEnableTriggerMode = RfsgMarkerEventOutputBehaviour.Toggle
};
ConfigureBurstedGeneration(nIRfsg, waveform, timing, paenConfig, out double period, out _);
nIRfsg.Initiate();
#endregion
RFmxInstrMX instr = new RFmxInstrMX("VST2", "");
RFmxWlanMX wlan = instr.GetWlanSignalConfiguration();
instr.GetWlanSignalConfiguration();
CommonConfiguration commonConfiguration = CommonConfiguration.GetDefault();
commonConfiguration.CenterFrequency_Hz = 2.412e9;
AutoLevelConfiguration autoLevel = new AutoLevelConfiguration
{
AutoLevelMeasureTime_s = period,
AutoLevelReferenceLevel = true
};
SA.RFmxWLAN.ConfigureCommon(instr, wlan, commonConfiguration, autoLevel);
SignalConfiguration signal = SignalConfiguration.GetDefault();
signal.AutoDetectSignal = false;
signal.ChannelBandwidth_Hz = 20e6;
signal.Standard = RFmxWlanMXStandard.Standard802_11ag;
SA.RFmxWLAN.ConfigureSignal(wlan, signal);
TxPConfiguration txpConfig = new TxPConfiguration
{
AveragingCount = 10,
MaximumMeasurementInterval_s = waveform.BurstLength_s,
AveragingEnabled = RFmxWlanMXTxpAveragingEnabled.True
};
SA.RFmxWLAN.ConfigureTxP(wlan, txpConfig);
OFDMModAccConfiguration modAccConfig = OFDMModAccConfiguration.GetDefault();
modAccConfig.OptimizeDynamicRangeForEvmEnabled = RFmxWlanMXOfdmModAccOptimizeDynamicRangeForEvmEnabled.False;
modAccConfig.AveragingEnabled = RFmxWlanMXOfdmModAccAveragingEnabled.True;
SA.RFmxWLAN.ConfigureOFDMModAcc(wlan, modAccConfig);
TxPServoConfiguration servoConfig = TxPServoConfiguration.GetDefault();
servoConfig.TargetTxPPower_dBm = 0.5;
SA.RFmxWLAN.TxPServoPower(wlan, nIRfsg, servoConfig, autoLevel);
SEMConfiguration semConfig = SEMConfiguration.GetDefault();
SA.RFmxWLAN.ConfigureSEM(wlan, semConfig);
wlan.Initiate("", "");
TxPResults txpRes = SA.RFmxWLAN.FetchTxP(wlan);
OFDMModAccResults modAccResults = SA.RFmxWLAN.FetchOFDMModAcc(wlan);
SEMResults semResults = SA.RFmxWLAN.FetchSEM(wlan);
Console.WriteLine("TXP Avg Power: {0:N}", txpRes.AveragePowerMean_dBm);
Console.WriteLine("Composite RMS EVM (dB): {0:N}", modAccResults.CompositeRMSEVMMean_dB);
Console.WriteLine("\n----------Lower Offset Measurements----------\n");
for (int i = 0; i < semResults.LowerOffsetMargin_dB.Length; i++)
{
Console.WriteLine("Offset {0}", i);
Console.WriteLine("Measurement Status :{0}",
semResults.lowerOffsetMeasurementStatus[i]);
Console.WriteLine("Margin (dB) :{0}", semResults.LowerOffsetMargin_dB[i]);
Console.WriteLine("Margin Frequency (Hz) :{0}", semResults.LowerOffsetMarginFrequency_Hz[i]);
Console.WriteLine("Margin Absolute Power (dBm) :{0}\n", semResults.LowerOffsetMarginAbsolutePower_dBm[i]);
}
Console.WriteLine("\n----------Upper Offset Measurements----------\n");
for (int i = 0; i < semResults.UpperOffsetMargin_dB.Length; i++)
{
Console.WriteLine("Offset {0}", i);
Console.WriteLine("Measurement Status :{0}", semResults.upperOffsetMeasurementStatus[i]);
Console.WriteLine("Margin (dB) :{0}", semResults.UpperOffsetMargin_dB[i]);
Console.WriteLine("Margin Frequency (Hz) :{0}", semResults.UpperOffsetMarginFrequency_Hz[i]);
Console.WriteLine("Margin Absolute Power (dBm) :{0}\n", semResults.UpperOffsetMarginAbsolutePower_dBm[i]);
}
Console.WriteLine("\n--------------------\n\nPress any key to exit.");
Console.ReadKey();
wlan.Dispose();
instr.Close();
AbortGeneration(nIRfsg);
CloseInstrument(nIRfsg);
}
