Service manual

Instrument Functions WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
104Operating Manual 1176.7649.02 ─ 04
See also chapter 3.4, "Signal Processing of the IEEE 802.11b Application", on page 29
Remote command:
[SENSe:]DEMod:FILTer:MODulation on page 187
Equalizer Filter Len. ← Filters (IEEE 802.11b, g)
Specifies the length of the equalizer filter in chips
Remote command:
[SENSe:]DEMod:FILTer:EFLength on page 186
FFT Start Offset (IEEE 802.11a, g, j, p)
This command specifies the FFT start offset.
"AUTO"
The FFT start offset is automatically chosen to minimize the intersym-
bol interference.
"Guard Interval
Cntr"
Guard Interval Center: The FFT start offset is placed to the center of
the guard interval.
"Peak"
The peak of the fine timing metric is used to determine the FFT start
offset.
Remote command:
[SENSe:]DEMod:FFT:OFFSet on page 186
4.3.2 Advanced Demod Settings (IEEE 802.11ac, n (MIMO) only)
The Advanced Demod settings allow you to specify the PPDUs to be analyzed. It also
provides settings to adapt the synchronisation to the channel conditions.
This tab is only available if the standard IEEE 802.11ac or n (MIMO) is selected.
PPDU format to measure............................................................................................104
Channel Bandwidth to measure..................................................................................105
MCS Index to use........................................................................................................105
MCS Index.................................................................................................................. 106
Nsts to use (IEEE 802.11 ac only).............................................................................. 106
Nsts (IEEE 802.11ac only)..........................................................................................106
STBC field...................................................................................................................106
Guard Interval Length................................................................................................. 107
Extension spatial streams (sounding) (IEEE 802.11ac or n (MIMO) only)..................108
Source of Payload Length...........................................................................................108
Power Interval Search (IEEE 802.11ac only)..............................................................108
FFT Start Offset.......................................................................................................... 108
PPDU format to measure
Defines the PPDU formats included in the analysis.
"Auto, same
type as first
PPDU"
All PPDUs identical to the first recognized PPDU are analyzed.
Demod Settings Dialog Box