MT Hamming Encoder (Systematic)

Encodes a sequence of data words systematically. This node arranges the output code word such that the entire data word sequence is maintained and preceded by the parity words.

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.

1378

Inputs/Outputs

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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.

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 = 2m-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 2m-m-1 and code word length equaling 2m-1. Valid values are 2 to 16, inclusive.

Default value: 3

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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.
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 value: TRUE

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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

Default value: No error

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output bit stream

The Hamming-encoded bits.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior