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MT Format Constellation (G Dataflow)

Last Modified: January 9, 2017

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.

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waveform

Recovered modulated data for plotting as a constellation.

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t0

Trigger (start) time of the Y array.

Default: 0.0

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dt

Time interval between data points in the Y array.

Default: 1.0

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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.

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samples per symbol

Number of samples per symbol in the recovered waveform.

Default: 16

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error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: no error

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constellation graph

A two-element array of XY data. Wire this parameter directly to an XY graph.

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constellation

An array of doubles representing the constellation plot.

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oversampled data

An array of doubles representing the oversampled data.

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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.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported


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