LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
556
User Manual 1173.9628.02 ─ 16
Sounding RS (SRS)
Indicates whether the uplink signal may contain a Sounding Reference Signal (SRS) or
not.
●
Disabled
: The uplink signal must not contain an SRS. Otherwise the modulation
results will be distorted.
●
Enabled
: The last SC-FDMA symbol of each subframe is not evaluated for modu-
lation results. So this symbol may be used for SRS signals without distorting the
modulation results.
In the Standalone (SA) scenario, this parameter is controlled by the measurement. In
the Combined Signal Path (CSP) scenario, this parameter is set by the signaling appli-
cation. A subsequent modification in the signaling application is also applied to the
measurement. But changing the setting in the measurement does not affect the signal-
ing application.
Remote command:
(SA)
(CSP)
EVM Window Length
Length of the EVM window, defined as a number of samples. The standard (3GPP TS
36.101, Annex F) specifies the window length as a function of the bandwidth and the
cyclic prefix. The R&S
CMW uses the "Current" value. This value is linked to the value
in the table, corresponding to the current cyclic prefix and bandwidth settings.
The window length defines the two sets of "l / h" modulation quantities in the result
tables; see
chapter 3.2.1.7, "Calculation of Modulation Results"
The minimum value of 1 FFT symbol actually corresponds to a window of zero length
so that EVM
h
= EVM
l
.
Remote command:
EVM Exclusion Periods
Exclusion periods to be considered for calculation of EVM, magnitude error and phase
error results (quantities with "low" and "high" values).
Separate settings are available for slots with detected channel type "PUCCH" and
"PUSCH":
●
PUCCH
: This parameter affects low and high single value results (tables below bar
graphs). If the parameter is enabled, the first and the last SC-FDMA symbol of
each slot are excluded from the calculation of these results. If the last symbol of a
slot is already excluded because SRS signals are allowed, the second but last
symbol is also excluded.
●
PUSCH
: This parameter affects all low and high results (single values and bar
graphs). The selected time intervals are excluded from the calculation of these
results.
The "Leading" time interval is excluded at the beginning of each subframe.
GUI Reference
深圳德标仪器