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Diffstat (limited to 'gr-fec/grc/variable_ldpc_H_matrix_object.block.yml')
| -rw-r--r-- | gr-fec/grc/variable_ldpc_H_matrix_object.block.yml | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gr-fec/grc/variable_ldpc_H_matrix_object.block.yml b/gr-fec/grc/variable_ldpc_H_matrix_object.block.yml new file mode 100644 index 0000000000..f2d1a640bd --- /dev/null +++ b/gr-fec/grc/variable_ldpc_H_matrix_object.block.yml @@ -0,0 +1,40 @@ +id: variable_ldpc_H_matrix_def +label: LDPC Parity Check Matrix + +parameters: +- id: value + label: Ignore Me + dtype: raw + default: '"ok"' + hide: all +- id: filename + label: File + dtype: file_open +- id: gap + label: Gap + dtype: int +value: ${ value } + +templates: + imports: from gnuradio import fec + var_make: self.${id} = ${id} = fec.ldpc_H_matrix(${filename}, ${gap}) + +documentation: |- + This block creates a FEC LDPC Parity Check Matrix variable. + + This variable can be used by: + 1) LDPC Encoder Definition (via Parity Check) block + 2) LDPC Bit Flip Decoder Definition block + + The format of alist files is described at: + http://www.inference.phy.cam.ac.uk/mackay/codes/alist.html + + The specific format of this parity check matrix is described by Richardson and Urbanke in Appendix A of their book: Modern Coding Theory (ISBN 978-0-521-85229-6). + + As an example, see the file {$target}/share/gnuradio/fec/ldpc/n_1800_k_0902_gap_28.alist, which is used by the FEC example flowgraph ber_curve_gen_ldpc.grc. + + There is a small library of encoding-ready alist files at {$target}/share/gnuradio/fec/ldpc. + + To convert a parity check matrix to the appropriate format required for this encoder, use the python functions in {$target}/lib/python2.7/dist-packages/gnuradio/fec/LDPC/Generate_LDPC_matrix.py. + +file_format: 1 |