Table Of Contents

MT Generate System Parameters (MT Generate ASK System Parameters (map)) (G Dataflow)

Version:
    Last Modified: February 7, 2018

    Calculates parameters for use with either MT Modulate ASK or MT Demodulate ASK. It accepts an array of symbol values that explicitly specifies the symbol positions of a symbol map with symbols that are evenly distributed between 0 and 1.

    connector_pane_image
    datatype_icon

    samples per symbol

    An even number of samples dedicated to each symbol. Multiply this value by the symbol rate to determine the sample rate.

    spd-note-note
    Note  

    The demodulation and detector nodes use timing recovery, which is optimized for four or more samples per symbol.

    Default: 16

    datatype_icon

    symbol values

    An array of symbol values with an index-based order that corresponds to the symbol map. The length of the symbol values array must be a positive power of 2, and the entries must be unique and in the range 0 to M-1, where M is the length of the symbol values array.

    This node expects an array of integers for the symbol values parameter. The integers 0 through (M-1) must all be included only once in the symbol values array, where M is the M-ary number of the modulation. The binary representation (LSB first convention) of the integers represents the bit pattern that is mapped to the corresponding symbol location in the symbol values array. The symbol locations are evenly spaced between (0 + 0i) and (1 + 0i), inclusive, along the real axis (I axis).

    For example, for 4-ASK, if you specify symbol values as [2 3 0 1], the generated ASK symbol map is [(0.667 + 0i), (1 + 0i), (0 + 0i), (0.333 + 0i)].

    spd-note-note
    Note  

    An entry at index n is mapped to the ASK symbol map at location n/(M-1), where M is the size of the ASK constellation. For example, if you specify symbol values with entries [0, 1, 2, 3], the symbol-to-symbol pairing is symbol 0 level 0, symbol 1 level 1/3, symbol 2 level 2/3, symbol 3 level 1.

    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

    ASK system parameters

    Parameter values defining the ASK system. Wire this cluster to the corresponding system parameters cluster of MT Modulate ASK or MT Demodulate ASK.

    datatype_icon

    samples per symbol

    Number of samples per symbol in the modulated output complex waveform. For error-free operation, the samples per symbol must be an even number.

    datatype_icon

    symbol map

    An ordered array that maps each Boolean symbol to its desired amplitude level. The number of ASK levels in the array must be 2 N , where N is the number of bits per symbol. The maximum amplitude level must be 1.

    datatype_icon

    bits per symbol

    Number of bits represented by each symbol. This value is equal to Log 2 (M), where M is the order of the modulation (for example, for 16-ASK, M = 16).

    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