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LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
555
User Manual 1173.9628.02 ─ 16
Fig. 3-41: Measurement control settings - modulation
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Modulation Scheme
Selects one of the three possible modulation schemes (QPSK, 16-QAM, 64-QAM) for
LTE uplink signals. The R&S
CMW can also auto-detect the modulation scheme (set-
ting: "Auto").
Auto-detection may fail for signals with a very poor modulation accuracy. In this case,
select the modulation scheme in accordance with the measured signal.
For remote operation it is recommended to select the modulation scheme manually to
ensure correct detection and speed up the measurement. The reset value differs from
the preset value.
Remote command:
Statistic Count
Defines the number of measurement intervals per measurement cycle for modulation
measurements. The following result views use this statistic count: EVM, magnitude
error, phase error, inband emissions, equalizer spectrum flatness, I/Q diagram and TX
measurement.
One measurement interval is completed when the R&S
CMW has measured a full slot
of the configured "Measure Subframe". The measurement always extends over the
whole subcarrier range.
The measurement provides independent statistic counts for different results. In single-
shot mode a measurement with a completed statistic count is stopped, even if another
measurement with an incomplete statistic count is still running.
Remote command:
GUI Reference
深圳德标仪器
135-1095-0799