GSM I/Q measurement results
R&S®VSE-K10
20User Manual 1176.8945.02 ─ 11
Table 4-1: Modulation accuracy parameters
Parame-
ter
Description SCPI query for result value
"EVM" Error vector magnitude for the Slot to Measure
RMS and peak error values for the current frame, in percent
95%ile: error value (in percent) below which 95% of all
"EVM" results for all frames in entire measurement fall
READ:BURSt[:MACCuracy][:EVM]:PEAK:
<Resulttype>?
READ:BURSt[:MACCuracy][:EVM]:RMS:
<Resulttype>?
READ:BURSt[:MACCuracy]PERCentile:EVM?
Mag Error Magnitude error for the Slot to Measure
RMS and peak error values for the current frame, in percent
95%ile: error value (in percent) below which 95% of all
"Magnitude Error" results for all frames in entire measure-
ment fall
READ:BURSt[:MACCuracy]:MERRor:PEAK:
<Resulttype>?
READ:BURSt[:MACCuracy]:MERRor:RMS:
<Resulttype>?
READ:BURSt[:MACCuracy]PERCentile:MERRor?
"Phase
Error"
Phase error for the Slot to Measure
RMS and peak error values for the current frame, in percent
95%ile: error value (in percent) below which 95% of all
"Phase Error" results for all frames in entire measurement
fall
READ:BURSt[:MACCuracy]:PERRor:PEAK:
<Resulttype>?
READ:BURSt[:MACCuracy]:PERRor:RMS:
<Resulttype>?
READ:BURSt[:MACCuracy]PERCentile:PERRor?
Origin Off-
set Sup-
pression
[dB]
Origin offset suppression for the demodulated signal in the
Slot to Measure; Indicates the suppression of the DC carrier;
the higher the suppression, the better the DUT
READ:BURSt[:MACCuracy]:OSUPpress:
<Resulttype>?
I/Q Offset
[%]
I/Q offset for the demodulated signal in the Slot to Measure READ:BURSt[:MACCuracy]:IQOFfset:
<Resulttype>?
I/Q Imbal-
ance
[%]
A measure for gain imbalances and quadrature errors
between the inphase and quadrature components of the sig-
nal.
READ:BURSt[:MACCuracy]:IQIMbalance:
<Resulttype>?
Frequency
Error
[Hz]
Frequency error of the center frequency currently measured
in the Slot to Measure
READ:BURSt[:MACCuracy]:FERRor:
<Resulttype>?
Burst
Power
[dBm]
Average power measured in the slot READ:BURSt[:MACCuracy]:BPOWer:
<Resulttype>?
Amplitude
Droop
[dB]
Indicates how much the amplitude decreases over a mea-
sured slot
READ:BURSt[:MACCuracy]:ADRoop:
<Resulttype>?
The R&S VSE GSM application also performs statistical evaluation over a specified
number of results (see "Statistic Count" on page 88). To do so, the same slot is evalu-
ated in multiple frames, namely in the number specified by the "Statistic Count". The
default value is 200 in accordance with the GSM standard.
For each parameter, the following results are displayed: