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https://github.com/saitohirga/WSJT-X.git
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39 lines
969 B
Plaintext
39 lines
969 B
Plaintext
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#!/bin/sh
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# this script characterizes a single code over a range of Eb/N0
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# note relationship between noise standard deviation, sigma, and Eb/No:
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# Eb/No = 1/(2*R*sigma^2)
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# If R=1/2, then Eb/No = 1/sigma^2
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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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n=174
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k=87
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m=$((n-k))
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seed=4
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ntrials=1000000
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rate=$(echo "scale=5; $k/$n" | bc)
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echo n=$n k=$k rate=$rate m=$m
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make-ldpc ldpc.pchk "$m" "$n" $seed evenboth 2x3/8x4 no4cycle
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make-gen ldpc.pchk ldpc.gen dense
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rand-src ldpc.src 1 "$k"x"$ntrials"
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encode ldpc.pchk ldpc.gen ldpc.src ldpc.enc
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for i in `seq -1 10`;
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do
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db=$(echo "scale=5; $i/2.0" | bc)
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ebno=$(echo "scale=5; e(0.1*$db*l(10.0))" | bc -l)
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sigma=$(echo "scale=5; 1/sqrt(2*$rate*$ebno)" | bc)
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echo db $db ebno $ebno sigma $sigma
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transmit ldpc.enc ldpc.rec 1 awgn $sigma
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decode ldpc.pchk ldpc.rec ldpc.dec awgn $sigma\
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prprp 250
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verify ldpc.pchk ldpc.dec ldpc.gen \
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ldpc.src
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done
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