WSJT-X/lib/ldpc/jtmode_codes/ldpc-search

#!/bin/sh
# search for a good code
#  make-ldpc ldpc.pchk $m $n $seed evenboth 2x3/8x4 no4cycle
n=128
k=80
m=$((n-k))
niterations=10

set -e  # Stop if an error occurs

rand-src  ldpc.src 2 "$k"x100000

for i in `seq 1 1000`
do
  seed=$i
  echo seed $seed
  make-ldpc ldpc.pchk $m $n $seed evenboth 124x3/4x4 no4cycle
  make-gen  ldpc.pchk ldpc.gen dense
  encode    ldpc.pchk ldpc.gen ldpc.src ldpc.enc
  transmit ldpc.enc ldpc.rec 1 awgn 0.7
  decode   ldpc.pchk ldpc.rec ldpc.dec awgn 0.70 prprp $niterations
  verify   ldpc.pchk ldpc.dec ldpc.gen ldpc.src
done