#!/bin/sh

# Example of how an LDPC code can be encoded using using sparse,
# dense, and mixed representations of the generator matrix.  The dense
# and mixed representations are based on the same set of message bits
# as the sparse method with minprod heuristic.  This allows the correctness 
# of these methods to be checked by verifying that they all produce the same 
# result when encoding random messages.  The results are also checked by 
# 'verify'.
#
# A (400,200) LDPC code with 3 checks per bit is used for the test.

set -e  # Stop if an error occurs
set -v  # Echo commands as they are read

make-ldpc ex-ldpc-encode.pchk 200 400 1 evenboth 3 

make-gen  ex-ldpc-encode.pchk ex-ldpc-encode.genf sparse first
make-gen  ex-ldpc-encode.pchk ex-ldpc-encode.genc sparse mincol
make-gen  ex-ldpc-encode.pchk ex-ldpc-encode.genp sparse minprod
make-gen  ex-ldpc-encode.pchk ex-ldpc-encode.gend dense ex-ldpc-encode.genp
make-gen  ex-ldpc-encode.pchk ex-ldpc-encode.genm mixed ex-ldpc-encode.genp

rand-src  ex-ldpc-encode.src 1 200x10

encode    ex-ldpc-encode.pchk ex-ldpc-encode.genf ex-ldpc-encode.src \
          ex-ldpc-encode.encf
encode    ex-ldpc-encode.pchk ex-ldpc-encode.genc ex-ldpc-encode.src \
          ex-ldpc-encode.encc
encode    ex-ldpc-encode.pchk ex-ldpc-encode.genp ex-ldpc-encode.src \
          ex-ldpc-encode.encp
encode    ex-ldpc-encode.pchk ex-ldpc-encode.gend ex-ldpc-encode.src \
          ex-ldpc-encode.encd
encode    ex-ldpc-encode.pchk ex-ldpc-encode.genm ex-ldpc-encode.src \
          ex-ldpc-encode.encm

cmp ex-ldpc-encode.encp ex-ldpc-encode.encd
cmp ex-ldpc-encode.encp ex-ldpc-encode.encm

verify    ex-ldpc-encode.pchk ex-ldpc-encode.encf ex-ldpc-encode.genf \
          ex-ldpc-encode.src
verify    ex-ldpc-encode.pchk ex-ldpc-encode.encc ex-ldpc-encode.genc \
          ex-ldpc-encode.src
verify    ex-ldpc-encode.pchk ex-ldpc-encode.encp ex-ldpc-encode.genp \
          ex-ldpc-encode.src