3 WLAN Mode
3.6 Modulation Analysis Measurement
Triangle Filter Length
This parameter is available when Radio Std is 802.11n/ac/ax/be and channel
estimation filter is Triangle.
Specifies the total length of the triangle filter’s impulse response.
Remote Command
:CALCulate:EVM:CEFilter:TFLength <integer>
:CALCulate:EVM:CEFilter:TFLength?
Example
:CALC:EVM:CEF:TFL 21
:CALC:EVM:CEF:TFL?
Notes Only used in 802.11n/ac/ax/be
Visible when Channel Estimation Filter Selection is Triangle
The value must be an odd number
Preset 5 subcarriers
State Saved Saved in instrument state
Min 1
Max Depend on the Radio Standard as follows
Radio Standard Max Value
802.11n/ac 20MHz 57 subcarriers
802.11n/ac 40M 117 subcarriers
802.11ac80MHz/80+80MHz 245 subcarriers
802.11ac160MHz 501 subcarriers
802.11ax/be 20MHz 245 subcarriers
802.11ax/be 40MHz 489 subcarriers
802.11ax/be 80MHz or 802.11ax80+80MHz 1001subcarriers
802.11ax/be 160MHz 2025 subcarriers
802.11be 320MHz 4073 subcarriers
Backwards Compatibility
SCPI
:CALCulate:EVM:SMEQualizer:LENGth <integer>
:CALCulate:EVM:SMEQualizer:LENGth?
Eq Training Using L-LTF
This parameter is available when Radio Std is 802.11n/ac/ax/be.
As this parameter is set to On, the channel estimation used by Equalizer is not only
from HE-LTF part, but also from L-LTF part. If HE-LTF data ensures the same
channel as L-LTF data, the algorithm is equivalent to extend the training sequence
length to improve the estimation accuracy to improve EVM performance.
WLAN Mode User's &Programmer's Reference 1022
To Next Page