3 WLAN Mode
3.6 Modulation Analysis Measurement
3.6.2.13 Signal Info
The Signal Info window appears in the following View:
View Size Position
Burst & Signal Info Half, full width Bottom
Marker Operation No
Corresponding Trace None
U-Sig No
The U-SIG content shall be identical in each non-punctured 20 MHz subchannels
within each 80 MHz subblock, while it can be different in each 80 MHz subblocks
when BW is greater than 80MHz.
You can choose ‘U-SIG No’ to see decoded information for each 80 MHz subblock.
Remote Command
:DISPlay:EVM:USIG[:NUMBer] <integer>
:DISPlay:EVM:USIG[:NUMBer]?
Example
:DISP:EVM:USIG 1
:DISP:EVM:USIG?
Preset 1
State Saved Saved in instrument state
Min 1
Max 1 for 11be 20M/40M/80M
2 for 11be 160M
4 for 11be 320M
3.6.2.14 Preamble Freq Error
Frequency error is the difference between the measured center frequency of the
transmitted signal and the setting center frequency. This trace shows how the
measured center frequency drifts during the preamble part of the burst. The units of
this trace are in Hz. This includes the constant frequency error in addition to any
time-varying frequency error.
Preamble Frequency Error is sampled at 64 times the subcarrier spacing for
802.11a/g/j/p (OFDM), 801.11g (DSSS-OFDM), 802.11n (20 MHz), and 128 times
the subcarrier spacing for 802.11n (40 MHz).
For 802.11a/g (OFDM) signal, the trace length is coupled with Sync Training
Sequence. When Sync Training Sequence is set to Short, Preamble Frequency Error
883 WLAN Mode User's &Programmer's Reference
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