Table Of Contents

MT Add AWGN (G Dataflow)

Version:
    Last Modified: February 7, 2018

    Generates zero-mean, complex additive white Gaussian noise (AWGN) with uniform power spectral density and adds it to the complex baseband modulated waveform.

    This node returns a signal-plus-noise waveform with a user-specified E b /N 0 , where E b represents the energy per bit, and N 0 represents the noise variance.

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    input complex waveform

    The modulated complex baseband waveform data.

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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 information symbol in the input complex waveform.

    Default: 16

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    bits per symbol

    The number of bits per symbol in the modulation format underlying the input complex waveform. For example, the number of bits per symbol in quadrature-phase shift keying (QPSK) is 2.

    Default: 1

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    eb/n0

    The desired E b /N 0 of the output complex waveform in dB.

    Default: 10

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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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    seed in

    The reseeding of the noise sample generator (when reset? is set to TRUE) . When seed in is greater than 0, the AWGN generator is reseeded using the seed you set. Use a value of -1 to reseed the AWGN generator with a random seed.

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    Note  

    The value of seed in is disregarded when reset? is set to FALSE.

    Default: -1 (0xFFFFFFFF)

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    reset?

    A Boolean that determines whether the node continues applying AWGN using the previous iteration states.

    TRUE Reseeds the AWGN generator.
    FALSE Maintains the previous state of the AWGN generator.

    Default: TRUE

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    output complex waveform

    The signal-plus-noise complex baseband waveform data returned by this node.

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    t0

    Trigger (start) time of the Y array.

    Default: 0

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    dt

    Time interval between data values 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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    seed out

    A seed for use in the seed in parameter during the next call to this node when reset? is set to FALSE.

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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.

    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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