Download Scale Tab

WLAN Measurements
WLAN Constellation Display
Settings tab
Description
Traces Tab (see page 200)
Enables you to select from magnitude or phase trace, save a trace, and recall an trace
Scale Tab (see page 201)
Specifies the Zoom scale, and vertical and horizontal positions of the display.
Prefs Tab (see page 204)
Specifies the units of the display and whether elements of the graphs are displayed.
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WLAN Constellation Display
The WLAN Constellation Display shows the WLAN signal modulation amplitude and phase in I
(horizontal) versus Q (vertical) form. For multicarrier WLAN OFDM signals, the points show all data
symbol subcarriers' modulation. For single-carrier 802.11b, each point corresponds to a single modulated
chip.
To show the WLAN Constellation display:
1. If you are analyzing a stored data file, recall the data file now. Otherwise, go to the next step.
2. Press the Displays button or select Setup > Displays.
3. In the Select Displays dialog, select WLAN Constellation in the Measurements box.
4. In the Available displays box, double-click the WLAN Constellation icon or select the icon and
click Add. The WLAN Constellation icon will appear in the Selected displays box and will no
longer appear under Available displays.
5. Click OK to show the WLAN Constellation display.
6. Set the Frequency appropriate for the signal.
7. Select Setup > Settings to display the control panel.
8. Select the Modulation Params tab. Set the Standard, Guard Interval, Channel Bandwidth, and
Subcarrier Spacing controls as appropriate for the input signal.
9. If you are analyzing a data file, press the Replay button to take measurements on the recalled
acquisition data file.
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