3 WLAN Mode
3.6 Modulation Analysis Measurement
covers both the short training sequence and the long training sequence(channel
estimation sequence), the length will be 16us. When the Sync type parameter is set
to Long (Channel Estimation Sequence), Preamble Frequency Error covers only the
channel estimation sequence, the length will be 8us.
For 802.11g (DSSS-OFDM), it can only use Long Sync Training Sequence, since it
does not contain the short training sequence
For 802.11n signal, the trace length is auto determined by signals.
For HT-mixed signals, the Preamble Frequency Error covers only the Legacy Short
Training Field (L-STF) and Legacy Long Training Field (L-LTF) parts of the preamble.
This is the initial 16 us of the burst.
For HT-greenfield signals, the Preamble Frequency Error covers only the Legacy
Short Training Field (L-STF) and the First High Throughput Long Training Field (HT-
LTF1) parts of the preamble. This is the initial 16 us of the burst.
The Preamble Freq Error vs. Time window appears in the following View:
View Size Position
Preamble Freq Error Full ---
Marker Operation Yes
Corresponding Trace n=12 Preamble Freq Error vs. Time trace
3.6.2.15 IQ Gain Imbalance
The IQ Gain Imbalance window appears in the following View:
View Size Position
I/Q Impairments One thirds, full width Top
Marker Operation Yes (Subcarrier – IQ Gain Imbalance)
Corresponding Trace n=19 IQ gain imbalance vs. Carrier trace
3.6.2.16 IQ Quadrature Skew
The IQ Quadrature Skew window appears in the following View:
View Size Position
I/Q Impairments One thirds, full width Middle
Marker Operation Yes (Subcarrier – IQ Quadrature Skew)
Corresponding Trace n=20 IQ quadrature error vs. Carrier trace
WLAN Mode User's &Programmer's Reference 884
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