Alpha / BT
The meaning and labeling of this edition field depends on the selected baseband
filter. For “Nyquist” filters (Raised Cosine and Square Root of Raised Cosine) it is
the ‘Alpha’ parameter (or roll-off factor) of the filter. For Gaussian filters it is the BT
(Bandwidth/symbol period product) parameter. Some filter types do not require an
additional filter parameter.
Data Source
This drop-down list allows the selection of different pseudo random binary
sequences as data sources for modulation. Choices are PRBS7 (Polynomial
D7+D6+1), PRBS10 (Polynomial x10+x7+1), PRBS11 (Polynomial x11+x9+1),
PRBS15 (Polynomial x15+x14+1), PRBS23 (Polynomial x23+x18+1), PRBS23p
(Polynomial x23+x21+x18+x15+x7+x2+1), and PRB31 (Polynomial x31+x28+1).
Data Length
This edition field may be used to set a given data length to be implemented by the
modulated signal. This field defaults to the maximum non-repeating length of the
selected PRBS. It also defaults to this value if the user types ‘0’ (Zero). Otherwise
the sequence will be truncated when the number of bits set by this control is
reached. If this number is longer than the PRBS maximum length, the sequence
will be re-started as many times as necessary.
Gray Coding
This checkbox enables gray coding for for the applicable modulation modes.
Corrections Section
File…
Opens a correction file selection dialog box. Default file extension is CSV (Comma-
Separated Values). The name of the successfully loaded correction factors file is
shown in the field located at the left of this button. The accepted format for
correction files may be found in the Correction File Format section.
Correction Mode
Correction files may contain data relative to the correction (magnitude and phase)
to be applied to the complex moduation signal (Correction_Factors) or it may
represent the system response to be corrected for flatness and linear phase
(Channel_Response).
Apply Corrections
This checkbox activates the application of the correction factors.
Additional Waveform Parameters Section
Waveform Length
It is an indictator only. The length is in samples of the resulting segment.
Max. Length
Maximum waveform length must be used to force the resulting waveform to be
shorter or equal to a limit set by the user.
Keep Sample Rate
This check box preserves the sampling rate to a user-defined value irrespective of
any other defined signal parameter. Keeping the sampling rate to a fixed value may
be necessary when multiple waveforms are created for usage in a sequence or
scenario.
Sample Rate
It is the final DAC conversion rate for the resulting signal. It may be set by the user
or automatically calculated depending on other signal parameters.
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