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34 lines
1.0 KiB
Plaintext
34 lines
1.0 KiB
Plaintext
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#!/bin/sh
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# Example of a (144,72) LDPC code with 3 checks per bit and 6 bits per
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# check, tested on Additive White Gaussian Noise channels with noise standard
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# deviations varying from 0.80 to 0.95.
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#
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# Testing is done by transmitting random messages, which is safer (though
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# slower) than using only zero messages. Decoding is done using a maximum
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# of 250 iterations of probability propagation.
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set -e # Stop if an error occurs
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set -v # Echo commands as they are read
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for i in `seq 1 1000`;
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do
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seed=$i
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echo seed $seed
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make-ldpc ldpc-144-72.pchk 72 144 $seed evenboth 6x3/4x4 no4cycle
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make-gen ldpc-144-72.pchk ldpc-144-72.gen dense
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rand-src ldpc-144-72.src 2 72x100000
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encode ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
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ldpc-144-72.enc
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# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dB
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transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.80
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decode ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.80\
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prprp 50
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verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
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ldpc-144-72.src
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done
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