Measurements
R&S
®
FSW
147
User Manual 1173.9411.02 ─ 19
CACLR channels
If two or more sub blocks are defined, the power in the gaps between the sub blocks
must also be measured (referred to as the
Cumulative Adjacent Channel Leakage
Ratio (CACLR) power
). According to the MSR standard, the CACLR is measured in the
two channels for the upper and lower gap (thus referred to as
CACLR channels
). The
power in the CACLR channels is then set in relation to the power of the two closest
transmission channels to either side of the gap.
CACLR channels are defined using bandwidths and spacings, relative to the outer
edges of the surrounding sub blocks. Since the upper and lower CACLR channels are
identical, only two channels must be configured. The required spacing can be deter-
mined according to the following formula (indicated for lower channels):
Spacing = [CF of the gap channel] - [left sub block center] + ([RF bandwidth of left sub
block] /2)
Adjacent channels
Adjacent channels are defined as in common ACLR measurements, using bandwidths
and spacings, however, relative to the start and stop frequency of the total block of
transmit channels:
●
The spacing of the lower adjacent channels refers to the CF of the first Tx channel
in the first sub block.
●
The spacing of the upper adjacent channels refers to the CF of the last Tx channel
in the last sub block.
Channel display for MSR signals
As in common ACLR measurements, the individual channels are indicated by different
colored bars in the diagram. The height of each bar corresponds to the measured
power of that channel. In addition, the name of the channel is indicated above the bar.
Sub blocks are named A,B,C,D,E and are also indicated by a slim blue bar along the
frequency axis.
Note that Tx channel names correspond to the specified technology (for LTE including
the bandwidth), followed by a consecutive number. (If the channel is too narrow to dis-
play the channel name, it is replaced by "..." on the screen.) Channel names cannot be
defined manually. The assigned sub block is indicated with the channel name, e.g.
"B:LTE_5M1" for the first Tx channel in sub block B that uses the LTE 5
MHz band-
width technology.
Gap channels (CACLR) are indicated by the names of the surrounding sub blocks (e.g.
"AB" for the gap between sub blocks A and B), followed by the channel name ("Gap1"
or "Gap2") and an "L" (for lower) or a "U" (for upper). Both the lower and upper gap
channels are displayed. However, if the gap between two sub blocks is too narrow, the
second gap channel may not be displayed. If the gap is even narrower, no gap chan-
nels are displayed.
Adjacent and alternate channels are displayed as in common ACLR measurements.
Channel Power and Adjacent-Channel Power (ACLR) Measurement
