Rohde & Schwarz FSW26 - Channel Power Basics

Measurements
R&S
®
FSW
138User Manual 1173.9411.02 ─ 19
Label Description
Channel Channel name as specified in the "Channel Settings" (see "Channel Names"
on page 158).
Bandwidth Configured channel bandwidth (see "Channel Bandwidths" on page 156)
Offset Offset of the channel to the TX channel (Configured channel spacing, see "Channel
Bandwidths" on page 156)
Power
(Lower/Upper)
The measured power values for the TX and lower and upper adjacent channels. The
powers of the transmission channels are output in dBm or dBm/Hz, or in dBc, relative
to the specified reference TX channel.
Retrieving Results via Remote Control
All or specific channel power measurement results can be retrieved using the
CALC:MARK:FUNC:POW:RES? command from a remote computer (see CALCulate:
MARKer:FUNCtion:POWer<sb>:RESult? on page 696). Alternatively, the results
can be output as channel power density, i.e. in reference to the measurement band-
width.
Furthermore, the measured power values of the displayed trace can be retrieved as
usual using the TRAC:DATA? commands (see TRACe<n>[:DATA] on page 922). In
this case, the measured power value for each sweep point (by default 1001) is
returned.
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.
● Measurement Methods......................................................................................... 138
● Measurement Repeatability.................................................................................. 140
● Recommended Common Measurement Parameters............................................141
● Measurement on Multi-Standard Radio (MSR) Signals........................................ 145
5.3.3.1 Measurement Methods
The channel power is defined as the integration of the power across the channel band-
width.
The Adjacent Channel Leakage Power Ratio (ACLR), also known as the Adjacent
Channel Power Ratio (ACPR), is defined as the ratio between the total power of the
adjacent channel to the carrier channel's power. An ACLR measurement with several
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 (Integration BandWidth method)
Channel Power and Adjacent-Channel Power (ACLR) Measurement