WSJT-X/lib/ldpc/jtmode_codes/ldpc-144-72-search

#!/bin/sh

# Example of a (144,72) LDPC code with 3 checks per bit and 6 bits per 
# check, tested on Additive White Gaussian Noise channels with noise standard 
# deviations varying from 0.80 to 0.95.
#
# Testing is done by transmitting random messages, which is safer (though 
# slower) than using only zero messages.  Decoding is done using a maximum 
# of 250 iterations of probability propagation.

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

rand-src  ldpc-144-72.src 2 72x100000

for i in `seq 3000 4000`;
do
  seed=$i
  echo seed $seed
make-ldpc ldpc-144-72.pchk 72 144 $seed evenboth 2x3/8x4 no4cycle
make-gen  ldpc-144-72.pchk ldpc-144-72.gen dense
encode    ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
          ldpc-144-72.enc


# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dB

transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.80
decode   ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.80\
         prprp 50
verify   ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
         ldpc-144-72.src 


done