Table Of Contents

MT Auto Configure CCDF (G Dataflow)

Version:
    Last Modified: February 7, 2018

    Returns the recommended I/Q acquisition settings to use with MT Compute CCDF. The recommended settings provide a set of values to configure the PXIe-5650/5651/5652 RF Analog Signal Generator for acquiring the input complex waveform to calculate the complementary cumulative distribution function (CCDF).

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    lowpass filter bandwidth

    The bandwidth, in Hertz (Hz), of the lowpass filter. The lowpass filter is the front-end digital filter that is applied to the acquired signal. Use the filter to remove the out-of-band signal content before computing the CCDF.

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    count

    Number of records to acquire.

    The number of records to acquire is computed using the following equation:

    Number of records = ceiling (count/(sampling rate * measurement interval)).

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    measurement interval

    The time, in seconds, to use to acquire a single record in the CCDF calculation.

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    trigger delay

    The delay, in seconds, from the trigger event to determine the start of the measurement interval.

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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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    lowpass filter type

    A value that indicates the type of filter to use for filtering the samples before calculating the CCDF.

    Name Description
    Gaussian

    Uses a Gaussian filter.

    Flat

    Uses a flat filter.

    None

    Does not use any filter.

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    recommended IQ acquisition settings

    Recommended settings.

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    records

    Number of records to acquire.

    The number of records to acquire is computed using the following equation:

    Number of records = ceiling (count/(sampling rate * measurement interval)).

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    sampling rate

    Recommended sample rate, in Hz. The sample rate is returned based on the value of the lowpass filter bandwidth parameter, even if you set the lowpass filter type parameter to None.

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    acquisition time

    Amount of time per record to acquire the input complex waveform, in seconds. This value might be larger than the measurement interval and takes into account measurement filter and processing delays.

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    pre-trigger delay

    Amount of time, in seconds, before the trigger. This value accounts for delays in the measurement process.

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    post-trigger delay

    Amount of time, in seconds, between the trigger and the acquisition process. This value is used when the actual signal to be measured is generated after the trigger.

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    min quiet time

    Minimum time, in seconds, during which the signal must remain below a certain value to trigger.

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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.

    Complementary Cumulative Distribution Function Measurement

    The CCDF is a statistical characterization of time-domain waveform that completely describes the power characteristics of a signal.

    A CCDF graph relates average signal power (x-axis) to signal power statistics (y-axis) such that each point on the CCDF curve shows how much time a signal spends at or above a given power level. The power level is expressed in dB relative to the average signal power level.

    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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