Channel
Independent checkboxes allow the definition of waveforms for Channel 1, Channel
2, or both. One of the boxes will be always checked and checking both is only
possible when both channels are coupled (see Channel Coupling control in Clock
Tab).
Segment Number
Target segment for each channel can be defined independently.
Modulation Parameters Section
Mod. Scheme
This drop-down list selects the different modulation scheme categories that are
supported (see list above).
Mod. Type/Mod. Order
This drop-down list selects the different modulation orders or modulation scheme
sub-types for the selected modulation scheme category.
Carrier Freq. / Offset Freq.
The purpose and labeling of this edition field changes depending on the generation
mode. For direct conversion modes, it handles the carrier frequency while for up-
converter modes it deals with the offset frequency (see the Apply Offset Freq.
control). Units in both cases are in Hz.
Symbol Rate
This edition field must be used to enter the signaling speed (or baud rate) for the
modulated signal expressed in Bauds (1 Baud = 1 Symbol/s).
Mod. Index(%)
This edition field only shows up when the ASK modulation scheme is selected. It
sets the modulation index as a percentage for the signal.
R2/R1 Ratio
This edition field only shows up when the 16APSK, 32APSK, and 16STAR
modulation schemes are selected. It sets the ratio between the radius of the two
inner symbol rings in the constellation.
R3/R1 Ratio
This edition field only shows up when the 32APSK modulation scheme is selected.
It sets the ratio between the radius of the outer and the most internal symbol rings
in the constellation.
Freq. Dev.
This edition field only shows up when the FSK modulation schemes are selected. It
sets the peak frequency deviation in Hz.
Mod. File..
This button only shows up when ‘Custom’ modulation scheme is selected. It opens
a file selection window where modulation definition files may be selected. If a valid
file is selected, its name will show up in the text field located at the left of this
button. Otherwise a “File Loading Error” message is shown.
Baseband Filter
This drop-down list can select different baseband filters to be applied to the
baseband symbols. Choices are ‘None’, ‘Raised_Cosine’, ‘Sqrt_Raised_Cosine’,
‘Gaussian_Dirac’, ‘Gaussian_Pulse’, ‘EDGE’, and ‘Half_Sine’.
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