Service manual

Instrument Functions WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
108Operating Manual 1176.7649.02 ─ 04
"Demod all as
short"
All PPDUs are demodulated assuming short guard interval length.
"Demod all as
long "
All PPDUs are demodulated assuming long guard interval length.
Remote command:
CONFigure:WLAN:GTIMe:AUTO:TYPE  on page 157
Extension spatial streams (sounding) (IEEE 802.11ac or n (MIMO) only)
defines the Ness field content of the PPDUs taking part in the analysis.
"Auto, same
type as first
PPDU"
All PPDUs using a Ness value identical to the first recognized PPDU
are analyzed.
"Auto, individu-
ally for each
PPDU"
All PPDUs are analyzed.
"Meas only if
Ness = <x>"
Only PPDUs with the specified Ness value are analyzed.
"Demod all as
Ness = <x>"
All PPDUs are analyzed assuming the specified Ness value.
Remote command:
CONFigure:WLAN:EXTension:AUTO:TYPE on page 156
Source of Payload Length
Defines how the payload length of the PPDUs to analyze is determined.
"Estimate from
Signal"
The payload length is estimated by the measurement application from
the signal.
"Take from HT-
SIG"
The payload length information from the HT-Signal field is used.
Remote command:
CONFigure:WLAN:PAYload:LENgth:SRC on page 160
Power Interval Search (IEEE 802.11ac only)
If enabled, the R&S FSV WLAN application initially performs a coarse burst search on
the input signal in which increases in the power vs time trace are detected. Further
time-consuming processing is then only performed where bursts are assumed. This
improves the measurement speed for signals with low duty cycle rates.
However, for signals in which the PPDU power levels differ significantly, this option
should be disabled as otherwise some PPDUs may not be detected.
Remote command:
[SENSe:]DEMod:TXARea on page 196
FFT Start Offset
This command specifies the FFT start offset.
"AUTO"
The FFT start offset is automatically chosen to minimize the intersym-
bol interference.
Demod Settings Dialog Box