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Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
160
User Manual 1178.8520.02 ─ 08
5.3.3
Channel power basics
Some background knowledge on basic terms and principles used in channel power
measurements is provided here for a better understanding of the required configuration
settings.
......................................................................................... 160
....................................................................................162
Recommended common measurement parameters
.............................................163
Measurement on multi-standard radio (MSR) signals
...........................................167
5.3.3.1
Measurement methods
The channel power is defined as the integration of the power across the channel band-
width.
The
A
djacent
C
hannel
L
eakage Power
R
atio (ACLR) is also known as the
A
djacent
C
hannel
P
ower
R
atio (ACPR). It is defined as the ratio between the total power of the
adjacent channel to the power of the carrier channel. An ACLR measurement with sev-
eral carrier channels (also known as transmission or TX channels) is also possible and
is referred to as a
multicarrier ACLR measurement
.
There are two possible methods for measuring channel and adjacent channel power
with a signal analyzer:
●
IBW method
(
I
ntegration
B
and
W
idth method)
●
Fast ACLR
(Zero-span method ), i.e. using a channel filter
IBW method
When measuring the channel power, the R&S
FSV/A integrates the linear power which
corresponds to the levels of the measurement points within the selected channel. The
signal analyzer uses a resolution bandwidth which is far smaller than the channel
bandwidth. When sweeping over the channel, the channel filter is formed by the pass-
band characteristics of the resolution bandwidth.
Figure 5-20: Approximating the channel filter by sweeping with a small resolution bandwidth
The following steps are performed:
1. The linear power of all the trace points within the channel is calculated.
Channel power and adjacent-channel power (ACLR) measurement