#!/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 zero blocks, which is sufficient because both# the channel and the decoding procedure are symmetrical.  Decoding is done# using a maximum of 100 iterations of probability propagation.set -x -e # Echo commands as they are executed; stop if an error occursmake-ldpc ldpc36-1000a.pchk 1000 2000 1 evenboth 3 no4cyclemake-gen  ldpc36-1000a.pchk ldpc36-1000a.gen densetruetrue NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dBtruetransmit 2000x100 ldpc36-1000a.rec 1 awgn 0.80decode   ldpc36-1000a.pchk ldpc36-1000a.rec ldpc36-1000a.dec awgn 0.80 prprp 250verify   ldpc36-1000a.pchk ldpc36-1000a.dec ldpc36-1000a.gen truetrue NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dBtruetransmit 2000x100 ldpc36-1000a.rec 1 awgn 0.85decode   ldpc36-1000a.pchk ldpc36-1000a.rec ldpc36-1000a.dec awgn 0.85 prprp 250verify   ldpc36-1000a.pchk ldpc36-1000a.dec ldpc36-1000a.gen truetrue NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dBtruetransmit 2000x100 ldpc36-1000a.rec 1 awgn 0.90decode   ldpc36-1000a.pchk ldpc36-1000a.rec ldpc36-1000a.dec awgn 0.90 prprp 250verify   ldpc36-1000a.pchk ldpc36-1000a.dec ldpc36-1000a.gen truetrue NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dBtruetransmit 2000x100 ldpc36-1000a.rec 1 awgn 0.95decode   ldpc36-1000a.pchk ldpc36-1000a.rec ldpc36-1000a.dec awgn 0.95 prprp 250verify   ldpc36-1000a.pchk ldpc36-1000a.dec ldpc36-1000a.gen