Rohde & Schwarz R&S FSL3 - Comparison to IQ Offset Measurement in K91 List Mode

R&S FSL WLAN TX Measurements (Option K91)
1300.2519.12 2.139 E-11
Fig. 2-89 RF carrier suppression measurement
Comparison to IQ offset measurement in K91/K91n list mode
The IQ offset measurement in K91 returns the actual carrier feed through normalized to the mean
power at the symbol timings. This measurement doesn't need a special test signal and is independent
of the transmit filter shape.
The RF carrier suppression measured according to the standard is inversely proportional to the IQ
offset measured in K91 list mode. The difference (in dB) between the two values depends on the
transmit filter shape and should be determined with one reference measurement.
The following table lists exemplary the difference for three transmit filter shapes
(
)
0.5 dB
± :
Transmit filter
IQ-Offset [dB] RF-Carrier-Suppression [d
B]

rectangular 11 dB
Root raised cosine,
0.22

=
10 dB
Gaussian,
0.3

=
9 dB