#!/bin/sh# Example of a (2000,1000) 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 occursset -v  # Echo commands as they are readmake-ldpc ex-ldpc36-1000a.pchk 1000 2000 1 evenboth 3 no4cyclemake-gen  ex-ldpc36-1000a.pchk ex-ldpc36-1000a.gen denserand-src  ex-ldpc36-1000a.src 1 1000x100encode    ex-ldpc36-1000a.pchk ex-ldpc36-1000a.gen ex-ldpc36-1000a.src \          ex-ldpc36-1000a.enc# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dBtransmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.80decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.80\         prprp 250verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \         ex-ldpc36-1000a.src # NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dBtransmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.85decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.85\         prprp 250verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \         ex-ldpc36-1000a.src # NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dBtransmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.90decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.90\         prprp 250verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \         ex-ldpc36-1000a.src # NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dBtransmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.95decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.95\         prprp 250verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \         ex-ldpc36-1000a.src