#!/bin/sh# Example of a (10000,5000) 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, with pipes used so that# intermediate files are avoided.  Decoding is done using a maximum of 250# iterations of probability propagation.set -e  # Stop if an error occursset -v  # Echo commands as they are readmake-ldpc ex-ldpc36-5000a.pchk 5000 10000 2 evenboth 3 no4cyclemake-gen  ex-ldpc36-5000a.pchk ex-ldpc36-5000a.gen denserand-src  ex-ldpc36-5000a.src 1 5000x100# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dBencode      ex-ldpc36-5000a.pchk ex-ldpc36-5000a.gen ex-ldpc36-5000a.src - \ | transmit - - 1 awgn 0.80 \ | decode   ex-ldpc36-5000a.pchk - - awgn 0.80 prprp 250 \ | verify   ex-ldpc36-5000a.pchk - ex-ldpc36-5000a.gen ex-ldpc36-5000a.src# NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dBencode      ex-ldpc36-5000a.pchk ex-ldpc36-5000a.gen ex-ldpc36-5000a.src - \ | transmit - - 1 awgn 0.85 \ | decode   ex-ldpc36-5000a.pchk - - awgn 0.85 prprp 250 \ | verify   ex-ldpc36-5000a.pchk - ex-ldpc36-5000a.gen ex-ldpc36-5000a.src# NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dBencode      ex-ldpc36-5000a.pchk ex-ldpc36-5000a.gen ex-ldpc36-5000a.src - \ | transmit - - 1 awgn 0.90 \ | decode   ex-ldpc36-5000a.pchk - - awgn 0.90 prprp 250 \ | verify   ex-ldpc36-5000a.pchk - ex-ldpc36-5000a.gen ex-ldpc36-5000a.src# NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dBencode      ex-ldpc36-5000a.pchk ex-ldpc36-5000a.gen ex-ldpc36-5000a.src - \ | transmit - - 1 awgn 0.95 \ | decode   ex-ldpc36-5000a.pchk - - awgn 0.95 prprp 250 \ | verify   ex-ldpc36-5000a.pchk - ex-ldpc36-5000a.gen ex-ldpc36-5000a.src