R&S FSW Series, Руководство пользователя

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Measurements and Results
R&S
®
FSW
246 User Manual 1173.9411.02 ─ 43
7.6.4.4 Multi-Standard Radio (MSR) SEM Measurements
Multi-standard radio (MSR) measurements allow you to perform SEM tests on signals
with multiple carriers using different digital standards. MSR measurements are descri-
bed in the specification 3GPP TS 37.141. Various typical combinations of standards for
base station tests are described, e.g. LTE FDD and W-CDMA carriers. By performing
an MSR SEM measurement you can determine if or how the different carriers affect
each other, i.e. if unwanted emissions occur. On the R&S
FSW, the MSR SEM mea-
surement is a standard measurement as for single carriers. The MSR settings merely
provide a convenient way of configuring the sweep list for all required ranges according
to the specification quickly.
Refined settings allow the R&S FSW to calculate the SEM limits according to standard
3GPP 37.141 V12.2.0, which distinguishes between base station configurations and
power values.
7.6.4.5 SEM with Multiple Sub Blocks ("Multi-SEM")
In the Spectrum application application only, spectrum emissions can be measured for
multiple sub blocks of channels (also referred to as a "Multi-SEM" measurement). Sub
blocks are a set of multiple ranges around a defined center frequency (carrier). Multiple
sub blocks can include gaps or overlap, and each sub block defines a separate mask.
In the overlapping masks, multi-limit lines are calculated. Up to 8 sub blocks (with 7
gaps) can be defined. For each sub block, the familiar configuration settings concern-
ing ranges, limit lines etc. can be defined individually.
Comparison to "traditional" SEM measurement
The default SEM measurement is simply a special case of " Multi-SEM " - consisting of
one single block. Only if the number of sub blocks in the basic SEM configuration is
larger than 1, multiple sub blocks are inserted in the configuration settings and result
tables.
Particular features of configuring multiple sub blocks
The sub blocks are independent of the global start, stop, center and span frequencies
for the complete SEM measurement. Thus, there can be gaps that can even include
other carrier ranges, but are not configured for the SEM measurement.
For each sub block, you define:
●
The center frequency of the reference range of the sub block; center frequencies
must be defined in ascending order for sub blocks A,B,C
●
The reference range; note that although individual ranges of different sub blocks
can overlap, reference ranges for different sub blocks can
not ; they must define dis-
tinct frequency ranges
●
The sweep list, including the limit lines
●
Optionally: a standard file or MSR settings to be used for measurement (if one is
selected, the other is disabled)
Spectrum Emission Mask (SEM) Measurement