3 WLAN Mode
3.6 Modulation Analysis Measurement
Command
:CALCulate:EVM:PILot:TRACk:TIMing?
Example
:CALC:EVM:PIL:TRAC:TIM 1
:CALC:EVM:PIL:TRAC:TIM?
Couplings
Coupled to ON when Symbol Clock Error Compensation switches to ON
Preset
OFF
State Saved Saved in instrument state
Range On|Off
Backwards
Compatibility
SCPI
[:SENSe]:EVM:TRACk:TIMing
Track Mode
This parameter is available when Radio Std is not 802.11b/g(DSSS/CCK/PBCC).
The Tracking Mode parameter specifies where the Pilot Tracking occurs. Traditional
single channel modulation always has the phase tracked after the equalizer. With
multiple data streams, that may not be the best place to do it. If the phase noise is
being generated by the receiver, the signal after the equalizer has a mixture of phase
noise from the two oscillators. Because of this mixing, it is difficult to track the phase
noise after applying the equalizer. The Pre EQ tracking algorithm tracks and remove
the phase noise before the equalizer. The Post EQ tracks and removes the phase
noise after the equalizer and is the default Tracking Mode.
Typically, if the phase noise is primarily caused by the receiver rather than the
transmitter, it's beneficial to select Pre EQ and do pilot tracking before the equalizer.
If the phase noise primarily comes from the transmitter and the phase noise from the
receiver is minimal, select Post EQ. Try both, look at the EVM and use the one that
gives the best result.
Remote
Command
:CALCulate:EVM:PILot:TRACk:MODE POSTeq | PREeq
:CALCulate:EVM:PILot:TRACk:MODe?
Example
:CALC:EVM:PILot:TRACk:MODE POST
:CALC:EVM:PILot:TRAck:MODE?
Preset
POSTeq
State Saved Saved in instrument state
Range Post EQ | Pre EQ
Sync Training Sequence
This parameter is available when Radio Std is 802.11a/b/g/j/p OFDM.
1015 WLAN Mode User's &Programmer's Reference
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