Keysight M9421A - DCM of Trigger-based PPDU

3 WLAN Mode
3.7 WLAN MIMO Modulation Analysis Measurement
More Information about HE PPDU
HE PPDU has four formats. The FORMAT parameter determines the overall structure
of the PPDU:
–
HE SU PPDU format is used for single-user PPDU, if FORMAT=HE_SU. In HE SU
PPDU format, the HE-SIG-A field is not repeated. Support for the HE SU PPDU
format is mandatory.
–
HE MU PPDU format is used for a multi-user PPDU that is not a response of a
Trigger frame, if FORMAT=HE_MU. It is similar to SU format, except that an HE-
SIG-B field is present. Support for the HE MU PPDU format is mandatory.
–
HE extended range SU PPDU format is used for single-user PPDU, if
FORMAT=HE_EXT_SU. It is similar to SU format, except that the HE-SIG-A field
is repeated.
–
HE trigger-based PPDU format is used for a PPDU that is a response of a Trigger
frame, if FORMAT=HE_TRIG. The preamble format is identical to the HE SU
PPDU format until the HE-STF field.
More Information about EHT PPDU
EHT PPDU has two formats.
EHT MU PPDU format is used for transmission to one or more users if the PPDU is
not a response to a triggering frame. In the EHT MU PPDU, the EHT-SIG field is
present. It’s used for non-OFDMA or OFDMA single or multiuser transmission.
EHT TB PPDU format is used for a transmission that is a response to a triggering
frame from an AP. In the EHT TB PPDU, the EHT-SIG field is not present and the
duration of the EHT-STF field is twice the duration of the EHT-STF field in the EHT
MU PPDU.
DCM of Trigger-based PPDU
This is available only when Radio Std is 802.11ax/be.
DCM (Dual sub-Carrier Modulation) information is defined in Trigger Frame,
applicable only to MCS 0,1,3,4.
HE Trigger-based PPDU format is used for a PPDU that is a response of a Trigger
frame, which does not include DCM information. You need to manually set the DCM
information to select EVM limit for your test.
See More Information about HE PPDU.
Remote Command
:CALCulate:EVMMimo:TBASed:DCM ON | OFF | 1 | 0
:CALCulate:EVMMimo:TBASed:DCM?
WLAN Mode User's &Programmer's Reference 1276