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MT Hamming Encoder (MT Hamming Encoder (Non-Systematic, Message-Generator Product)) (G Dataflow)

Version:
    Last Modified: February 7, 2018

    Encodes the data words using non-systematic methods. In the encoded code words, the whole data word sequence might not be explicitly present. The code word is generated as a finite field polynomial multiplication of the information and the generator polynomial.

    Generates an order-m Hamming-encoded bit stream. The order-m Hamming codes are specialized Bose-Chaudhari-Hocquenghem (BCH) codes in which the data word length equals 2m-m-1, code word length equals 2m-1, and the error correcting capacity equals 1. Valid values of m are 2 to 16, inclusive.

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    input bit stream

    Bit sequence representing the data bits to encode. Use the bits generated by MT Generate Bits to produce this bit stream or wire a custom data bit stream to this parameter.

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    Tip  

    To ensure that the output bit stream returned by this node corresponds to the entire message, set the length of input bit stream to be an integer multiple of the data word length k, where k = 2 m -m-1. If the length of input bit stream is not an integer multiple of k, the last {length(input bit stream) modulo k} bits are buffered in the encoder. These bits are added to the beginning of the incoming bit stream during the beginning of the next iteration if reset? is set to FALSE.

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    hamming order

    The Hamming order m sets the Hamming code with data word length equaling 2 m -m-1 and code word length equaling 2 m -1. Valid values are 2 to 16, inclusive.

    Default: 3

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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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    reset?

    A Boolean that determines whether the internal state of the encoder is cleared.

    TRUE Clears any buffered bits from previous iterations. Also initializes the Galois field structure corresponding to the Hamming code values.
    FALSE Continues encoding from the previous iteration. Any buffered bits from the previous iteration are added to the beginning of the input bit stream prior to encoding.
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    Tip  

    The initialization of the Galois field structure may consume significant amounts of time for code word lengths greater than 127. Once initialized, the same Galois field structure is used in every iteration thereafter, provided reset? is FALSE. To improve the performance of this node, set reset? to TRUE for the first iteration and FALSE thereafter.

    Default: TRUE

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    output bit stream

    Bit sequence encoded by this node.

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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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