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MT Format Constellation (G Dataflow)

Version:
    Last Modified: February 7, 2018

    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.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    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.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    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

    Web Server: Not supported in VIs that run in a web application


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