3 WLAN Mode
3.6 Modulation Analysis Measurement
Max For 802.11a/g/j/p (OFDM), 801.11g (DSSS-OFDM), 802.11n/ac/ah/af/ax/be: 21848 symbols
For 802.11b/g (DSSS/CCK/PBCC): 96360 chips
Max value is also limited by Hardware capability
Meas Offset
For 802.11a/g/j/p (OFDM), 801.11g (DSSS-OFDM), 802.11n/ac/ah/af/ax/be:
This parameter specifies the measurement offset, in symbol times, of the portion of
the OFDM burst that will be analyzed. The length of this analyzed portion of the
OFDM burst is specified by Meas Interval.
For 802.11b/g (DSSS/CCK/PBCC):
Used to set the measurement offset, in chips, of the portion of the WLAN burst that
will be analyzed. The length of this analyzed portion of the WLAN burst is specified
by Meas Interval. If the specified measurement offset is less than zero, a value of
zero is used instead.
The measurement interval and offset are relative to the ideal starting point of the
PLCP preamble portion of the burst. For a signal that uses the long PLCP format, the
ideal starting point of the PLCP preamble is exactly 128 symbol times (128*11 chip
times) before the start of the SFD sync pattern. For a signal that uses the short PLCP
format, the ideal starting point of the PLCP preamble is exactly 56 symbol times
(56*11 chip times) before the start of the SFD sync pattern.
Remote
Command
[:SENSe]:EVM:TIME:OFFSet <integer>
[:SENSe]:EVM:TIME:OFFSet?
Example
:EVM:TIME:OFFS 15
:EVM:TIME:OFFS?
Preset 802.11a/g/j/p (OFDM), 801.11g (DSSS-OFDM802.11n/ac/ah/af/ax/be:
0 symbols
802.11b/g (DSSS/CCK/PBCC): 22 chips
State Saved Saved in instrument state
Min 802.11a/g/j/p (OFDM), 801.11g (DSSS-OFDM802.11n/ac/ah/af/ax/be: Min = 0 symbols
802.11b/g (DSSS/CCK/PBCC): Min = 0 chips
Max If Result Length is Auto, then the specified measurement offset will be clipped to be less than or equal
to the value of Max Result Length – Meas Interval
If Result Length is Man, then the specified measurement offset will be clipped to be less than or equal
to the value of Result Length – Meas Interval
Result Length
For 802.11a/g/j/p (OFDM) and 801.11g (DSSS-OFDM):
WLAN Mode User's &Programmer's Reference 1008
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