| Communications Blockset™ | |
Encode binary low-density parity-check code specified by parity-check matrix
Block sublibrary of Error Detection and Correction
This block supports encoding of low-density parity-check (LDPC) codes, which are linear error control codes with sparse parity-check matrices and long block lengths that can attain performance near the Shannon limit.
The LDPC Encoder block uses the same algorithm as the fec.ldpcenc Communications Toolbox™ object. See LDPC Encoding Method for details.
(n – k) and n are the number of rows and columns, respectively, in the parity-check matrix.
Both the input and the output are discrete-time signals. The
ratio of the output sample time to the input sample time is
. The input must be a real
frame-based signal.
The output inherits the data type of the input, and the input must be binary-valued (0 or 1).
Type commdvbs2 at the command line to see a demo using this block.
Note Model initialization or update may take a long time, because a large matrix may need to be inverted (when the last (n – k) columns of the parity-check matrix is not triangular). |
This block can accept a sparse matrix with dimension n - k by n (n > k > 0) of real numbers. All nonzero elements must be equal to 1. n and k are only limited by the amount of available memory.
The default value is the parity-check matrix of the half-rate LDPC code from the DVB-S.2 standard.
| LDPC Decoder | Linearized Baseband PLL | |
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