Table Of Contents

MT Map Symbols to Bits (MT Map MSK Symbols to Bits) (G Dataflow)

Version:
    Last Modified: February 7, 2018

    Maps symbols comprised of MSK frequency deviations to an output bit stream based on a user-specified symbol rate.

    Programming Patterns
    Use this node in conjunction with MT Matched Filter, MT Align to Ideal Symbols, MT Decimate Oversampled Waveform, and MT Calculate BER to perform waveform analysis on the modulated waveform.
    spd-note-note
    Note  

    The mapping of symbols to bits depends on the number of bits per symbol, which equals log 2 ( M ) with M representing the size of the modulation scheme. For example, in a 256-QAM system, 500 QAM symbols are mapped to ( 500 ) × log 2 ( 256 ) = 4000 m e s s a g e b i t s .

    connector_pane_image
    datatype_icon

    symbols

    An array of frequency deviations for one-to-one mapping to the output bit stream.

    datatype_icon

    symbol rate

    The symbol rate, in hertz (Hz), of the symbols data.

    spd-note-note
    Note  

    For MSK modulation, the frequency deviation is ¼ the symbol rate. For nondifferential MSK, the symbol-to-bit mapping is performed by mapping bit 0 -0.25 × symbol rate, and mapping bit 1 +0.25 × symbol rate.

    datatype_icon

    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

    datatype_icon

    differential encoding enable

    A value that indicates whether to enable differential encoding of the input symbols prior to mapping to the output bit stream.

    Name Description
    disable

    Disables differential encoding for input symbols.

    enable

    Enables differential encoding for input symbols.

    Default: enable

    datatype_icon

    reset?

    A Boolean that determines whether stored state information is cleared on each call to this node.

    When the input bit stream is not comprised of an integer number of symbols, the carryover bits are buffered.

    TRUE Clears the buffered data, checks the input parameters on a first call, and reflects any change in the input parameter values during subsequent iterations.
    FALSE Adds the buffered data to the beginning of data from next iteration, in continuous operations.

    Default: TRUE

    datatype_icon

    output bit stream

    A bit stream with a one-to-one mapping to the input symbols based on the specified symbol map.

    datatype_icon

    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


    Recently Viewed Topics