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

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

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 2^m-m-1, code word length equals 2^m-1, and the error correcting capacity equals 1. Valid values of m are 2 to 16, inclusive.

Inputs/Outputs

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 = 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.

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 value: 3

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

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

output bit stream

Bit sequence encoded by this node.

error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior