Operating Manual R&S SMIQ - Volume 1 - Rohde & Schwarz

SMIQTest Procedures5.3.24.6 Signal/Noise Ratio (Carrier/Noise Ratio) WorldspaceTest equipmentTest setupTest methodSee aboveSee aboveSee aboveMeasurement Settings on SMIQ:LEVEL -15 dBmFREQ 1.472 GHzSwitch on digital modulation standard WORLDSPACE.Switch on filter mode LOW_EVM.Data source PRBSSwitch on noise with C/N = -5 dB / 4 dB / 20 dB andSYSTEM BANDWITH = 1.84 MHz. Measure C/N with channel bandwidth and system bandwidth1.84 MHz. Repeat all measurements with DISTORTION ON, LIST TWTA.5.3.24.7 Error VectorTest equipmentMeasurementDemodulator for digital modulation (Table 5-1, item 23) Settings on SMIQ:- Test level Pvm max (PEP)- Test frequency 1.472 GHz and frequencies according to Table 5-2- Switch on digital modulation standard WORLDSPACE- Switch on filter mode LOW_EVM- Data source PRBS- Switch on DISTORTION CHARACTERISTIC TEST Settings on demodulator:- QPSK modulation- Symbol rate = 1.84 Msym/s- Filter: SQR COS 0.4- Reference level = Pvm max + 3 dBm- Evaluation over 150 symbols- 10 averaging procedures Measure the error vector magnitude (rms) on the demodulator.1125.5555.03 5.75E-9