Displaying a Constellation Diagram (TEDS)
To display a constellation diagram for the default subcarrier(-4) using a test signal for TEDS Normal Uplink, 50kHz, 16QAM:
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Load the demo signal (see Loading a TEDS Demo Signal).
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Select TEDS demodulation (see Selecting TEDS Demodulation).
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In the Displaying TEDS Demod Properties Dialog Box ), select a channel bandwidth of 50kHz. The must be selected before a can be used.
tab of the dialog box (see - . The VSA will then set certain parameters based on a Normal Uplink slot format / 50kHz channel bandwidth. The parameter settings are listed in
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In the Displaying TEDS Demod Properties Dialog Box ), select 16QAM for the modulation type (if necessary).
tab of the TEDS Demod Properties dialog box (see -
Click within a trace, and then select IQ Normalize (Advanced Tab).
, followed by (if necessary) to display the constellation diagram for this TEDS signal. If you do not see a corresponding constellation diagram, the constellation diagram is scattered. If the constellation diagram is too small, check your recording and parameter settings. Try . Make sure your recording is running. Verify you selected -
In the Analysis Subcarrier drop-down menu and notice your selections appear in the upper-left corner of your subcarrier constellation display.
dialog box, select the tab. Choose different subcarriers in the -
To zoom in on a portion of the constellation diagram, in the Toolbar click the Select Area icon (next to the Pointer icon), select the area of the diagram of interest, choosing
. Repeat to zoom in further.
See Also