R&S FSW Series, Руководство пользователя

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Measurements and Results
R&S
®
FSW
155 User Manual 1173.9411.02 ─ 43
this case, the measured power value for each sweep point (by default 1001) is
returned.
For a full list of remote commands for ACLR measurements, see Chapter 14.5.3.9,
"Retrieving and Analyzing Measurement Results" , on page 888.
7.2.3 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.
● Measurement Methods ......................................................................................... 155
● Measurement Repeatability .................................................................................. 157
● Recommended Common Measurement Parameters ............................................158
● Measurement on Multi-Standard Radio (MSR) Signals ........................................ 162
7.2.3.1 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 FSW 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.
Channel Power and Adjacent-Channel Power (ACLR) Measurement