47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
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#!/bin/sh
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# Example of a (10000,5000) LDPC code with varying numbers of check per bit,
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# tested on Additive White Gaussian Noise channels with noise standard
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# deviations varying from 0.80 to 0.95. The code has 20% columns with two
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# check bits, 70% columns with three check bits, and 10% columns with seven
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# check bits.
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#
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# Testing is done by transmitting random messages, with pipes used so that
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# intermediate files are avoided. Decoding is done using a maximum of 250
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# 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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make-ldpc ex-ldpcvar-5000a.pchk 5000 10000 2 evenboth 2x2/7x3/1x7 no4cycle
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make-gen ex-ldpcvar-5000a.pchk ex-ldpcvar-5000a.gen dense
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rand-src ex-ldpcvar-5000a.src 1 5000x100
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# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dB
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encode ex-ldpcvar-5000a.pchk ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src - \
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| transmit - - 1 awgn 0.80 \
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| decode ex-ldpcvar-5000a.pchk - - awgn 0.80 prprp 250 \
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| verify ex-ldpcvar-5000a.pchk - ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src
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# NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dB
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encode ex-ldpcvar-5000a.pchk ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src - \
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| transmit - - 1 awgn 0.85 \
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| decode ex-ldpcvar-5000a.pchk - - awgn 0.85 prprp 250 \
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| verify ex-ldpcvar-5000a.pchk - ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src
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# NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dB
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encode ex-ldpcvar-5000a.pchk ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src - \
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| transmit - - 1 awgn 0.90 \
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| decode ex-ldpcvar-5000a.pchk - - awgn 0.90 prprp 250 \
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| verify ex-ldpcvar-5000a.pchk - ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src
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# NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dB
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encode ex-ldpcvar-5000a.pchk ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src - \
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| transmit - - 1 awgn 0.95 \
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| decode ex-ldpcvar-5000a.pchk - - awgn 0.95 prprp 250 \
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| verify ex-ldpcvar-5000a.pchk - ex-ldpcvar-5000a.gen ex-ldpcvar-5000a.src
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