Rohde & Schwarz CMU-K20, Operating Manual

Page: 131 / 646

CMU-K20/K21/K22/K23/K24 Non Signalling: Modulation Measurements
1115.6088.12 4.53 E-11
Ovw., EVM, ME,
PE 8PSK The Ovw., EVM, ME, PE 8PSK table section defines all limits for 8PSK-modulated
signals. The limits are set independently for the display modes Current and
Max./Min. on one hand, Average on the other hand; see section Measurement
Control (Modulation Configuration – Control) on page 4.50 ff.
95
th
percentile PE Upper limit for the phase error below which 95% of all
measured phase error values are located
95
th
percentile ME Upper limit for the magnitude error below which 95% of all
measured relative magnitude error values are located
95
th
percentile EVM Upper limit for the relative error vector magnitude below which
95% of all measured EVM values are located
Error Vector Magn. Upper limits for the (peak and RMS-averaged
2
) relative error
vector magnitude (EVM). Both entries are positive.
Magnitude Error Upper limits for the absolute value of the (peak and RMS)
relative magnitude error. Both entries are positive; the limits for
the peak magnitude error define a tolerance mask symmetric
to the origin.
Phase Error Upper limits for the absolute value of the (peak and RMS)
phase error. Both entries are positive; the limits for the peak
phase error define a tolerance mask symmetric to the origin.
Origin Offset Upper limit for the origin offset in the I/Q constellation diagram.
Frequency Error Upper limit for the difference between the measured and the
expected frequency of the signal.
For an explanation of all measured quantities refer to the beginning of this section
on page
4.43 .
Remote control
CONFigure:MODulation:OEMP:EPSK:LIMit[:CURRent] ...
CONFigure:MODulation:OEMP:EPSK:LIMit:AVERage ...
Ext. Phase Error
GMSK
The table section Ext. Phase Error GMSK defines upper limits for the different
GMSK modulation parameters. The limits depend on the display mode of the
measurement curve:
Current & Max. Common limits for the Current measurement curve and for the
Minimum/Maximum curve (including the Current and the
Max./Min scalar results)
Average Limits for the Average measurement curve (including the
Average scalar results)
For setting of the display mode see section Measurement Control (Modulation
Configuration – Control) on page 4.50 .
The meaning of the error limits is the same for the Current or Minimum/Maximum
(Current & Max.) and the Average results:
Phase Error Peak Maximum phase error
Phase Error RMS RMS phase error (RMS-averaged over the burst)
Origin Offset Upper limit for the origin offset in the I/Q constellation diagram.
I/Q Imbalance Upper limit for the amplitude difference between the in-phase
and quadrature components of the signal.
Frequency Error Average frequency error in the burst
The Phase Error Peak and the Frequency Error are quantities with alternating sign;
the corresponding limits are symmetric to the origin (i.e. the absolute value of both
2
To keep the results comparable, RMS averaging was chosen for both positive quantities and quantities with alternating sign. The RMS-averaged EVM is calculated
according to the rule of GSM 05.05.
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