MT Format Constellation
- Updated2023-02-17
- 3 minute(s) read
MT Format Constellation
Prepares a signal for presentation on a graph that shows the detected symbol locations and the transitions between those symbols. The node specifies a complex-valued waveform and displays a constellation plot of the waveform contents.
This node assumes that the input waveform is a digitally modulated complex baseband signal containing samples that fall on symbol boundaries with a sample rate that is an integer multiple of the samples per symbol value.
Inputs/Outputs
waveform
Recovered modulated data for plotting as a constellation.
t0
Trigger (start) time of the Y array.
Default value: 0.0
dt
Time interval between data points in the Y array.
Default value: 1.0
Y
The complex-valued signal-only baseband modulated waveform. The real and imaginary parts of this complex data array correspond to the in-phase (I) and quadrature-phase (Q) data, respectively.
samples per symbol
Number of samples per symbol in the recovered waveform.
Default value: 16
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Default value: No error
constellation graph
A two-element array of XY data. Wire this parameter directly to an XY graph.
constellation
An array of doubles representing the constellation plot.
oversampled data
An array of doubles representing the oversampled data.
error out
Error information.
The node produces this output according to standard error behavior.
Use with Demodulation Nodes
Although this node performs no demodulation or frequency correction, you can use this node to examine the output of many of the digital demodulation nodes. In cases where the demodulator can recover symbol timing, the output complex waveform parameter of the digital demodulation nodes contains a frequency-corrected signal appropriate for plotting using this node.