Service manual

Instrument Functions WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
109Operating Manual 1176.7649.02 ─ 04
"Guard Interval
Cntr"
Guard Interval Center: The FFT start offset is placed to the center of
the guard interval.
Remote command:
[SENSe:]DEMod:FFT:OFFSet on page 186
4.3.3 MIMO Settings (IEEE 802.11ac, n (MIMO) only)
The MIMO settings define the mapping between streams and antennas.
This tab is only available if the standard IEEE 802.11ac or n (MIMO) is selected.
Spatial Mapping Mode................................................................................................ 109
Power Normalise.........................................................................................................109
User Defined Spatial Mapping.................................................................................... 109
Spatial Mapping Mode
Defines the mapping between streams and antennas.
"Direct"
The mapping between streams and antennas is the identity matrix.
See also section "20.3.11.10.1 Spatial Mapping" of the IEEE 802.11n
WLAN standard.
"Spatial
Expansion:"
For this mode all streams contribute to all antennas. See also section
"20.3.11.10.1 Spatial Mapping" of the IEEE 802.11n WLAN standard.
"User defined"
The mapping between streams and antennas is defined by the User
Defined Spatial Mapping table.
Remote command:
CONFigure:WLAN:SMAPping:MODE on page 161
Power Normalise
Specifies whether an amplification of the signal power due to the spatial mapping is
performed according to the matrix entries.
"On"
Spatial mapping matrix is scaled by a constant factor to obtain a pas-
sive spatial mapping matrix which does not increase the total trans-
mitted power.
"Off"
Normalization step is omitted
Remote command:
CONFigure:WLAN:SMAPping:NORMalise on page 162
User Defined Spatial Mapping
Define your own spatial mapping between streams and antennas.
For each antenna (TX1..4), the complex element of each STS-Stream is defined. The
upper value is the real part part of the complex element. The lower value is the imagi-
nary part of the complex element.
Additionally, a "Time Shift" can be defined for cyclic delay diversity (CSD).
The stream for each antenna is calculated as:
Demod Settings Dialog Box