Fetches the preamble frequency error trace for signals containing an OFDM payload. Preamble frequency error computes the variations, across time, of the frequency error over initial 16us which comprises of the short training field (STF) and long training field (LTF) symbols.


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Inputs/Outputs

  • cstr.png Selector String —

    Selector String specifies a selector string comprising of the signal name and result name. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name, the default result instance is used. The default value is "" (empty string).

    Example:

    ""

    "signal::sig1"

    "result::r1"

    "signal::sig1/result::r1"

    You can use the RFmxWLAN Build Signal String VI to build the selector string.

  • cgenclassrntag.png Instrument Handle In —

    Instrument Handle In specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr Initialize NIRFSA VI or the RFmxInstr Initialize NIRFSA (Array) VI.

  • cdbl.png Timeout (s) —

    Timeout specifies the timeout for fetching the specified measurement. Set this value to an appropriate time, longer than expected for fetching the measurement. A value of -1 specifies that the VI waits until the measurement is complete. This value is expressed in seconds. The default value is 10.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • igenclassrntag.png Instrument Handle Out —

    Instrument Handle Out passes a reference of your RFmx session to the next VI.

  • icclst.png Preamble Frequency Error (Hz) —

    Preamble Frequency Error (Hz) returns the preamble frequency error trace for signals containing an OFDM payload. Preamble frequency error computes the variations, across time, of the frequency error over initial 16us which comprises of the short training field (STF) and long training field (LTF) symbols.

  • idbl.png x0 —

    x0 returns the start time in seconds.

  • idbl.png dx —

    dx returns the time increment value. This value is the reciprocal of OFDM ModAcc processing rate.

  • i1dsgl.png y —

    y returns the preamble frequency error at every sampling time. This value is expressed in Hz.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.