Measurements
R&S
®
FSW
205
User Manual 1173.9411.02 ─ 19
5.6.4.4
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 very quickly.
As of firmware version 2.00, 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.
5.6.4.5
SEM with Multiple Sub Blocks ("Multi-SEM")
As of firmware version 1.91, and in the Spectrum 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 fre-
quency (carrier). Multiple sub blocks may include gaps or overlap, and each sub block
defines a separate mask. The behavior in the overlapping masks is defined by multi-
limit line calculation. Up to three sub blocks (with two gaps) can be defined. For each
sub block, the familiar configuration settings concerning ranges, limit lines and MSR
can be defined individually.
Comparison to "traditional" SEM measurement
The default SEM measurement as performed and configured in previous firmware ver-
sions is simply a special case of "
Multi-SEM
" - consisting of one single block. Only
when you define a number of sub blocks larger than 1 in the basic SEM configuration,
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 may 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
may overlap, reference ranges for different sub blocks may
not
; they must define
distinct 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
