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Code sf2 has better than 3x10^-5 undetected error rate.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6441 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-01-26 02:52:07 +00:00
parent 75a97bec32
commit af03dbe646
4 changed files with 79 additions and 4 deletions
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3
lib/ldpc/jtmode_codes/ldpc-144-72
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@ -10,7 +10,8 @@ set -v # Echo commands as they are read
#make-ldpc ldpc-144-72.pchk 80 160 12 evenboth 6x3/4x4 no4cycle
#make-ldpc ldpc-144-72.pchk 72 144 33 evenboth 6x3/4x4 no4cycle
#make-ldpc ldpc-144-72.pchk 72 144 8 evenboth 3 no4cycle
cp ldpc-144-72-6x3-4x4-sf1.pchk ldpc-144-72.pchk
make-ldpc ldpc-144-72.pchk 72 144 1087 evenboth 3x3/7x4 no4cycle
#cp ldpc-144-72-6x3-4x4-sf1.pchk ldpc-144-72.pchk
make-gen ldpc-144-72.pchk ldpc-144-72.gen dense
rand-src ldpc-144-72.src 1 72x1000000
encode ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \

BIN
lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk Normal file
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Binary file not shown.

6
lib/ldpc/jtmode_codes/ldpc-144-72-search
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@ -11,11 +11,11 @@
set -e # Stop if an error occurs
set -v # Echo commands as they are read
for i in `seq 1 1000`;
for i in `seq 1000 2000`;
do
seed=$i
echo seed $seed
make-ldpc ldpc-144-72.pchk 72 144 $seed evenboth 6x3/4x4 no4cycle
make-ldpc ldpc-144-72.pchk 72 144 $seed evenboth 5x3/5x4 no4cycle
make-gen ldpc-144-72.pchk ldpc-144-72.gen dense
rand-src ldpc-144-72.src 2 72x100000
encode ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
@ -31,4 +31,4 @@ verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
ldpc-144-72.src
done
done

74
lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt Normal file
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@ -0,0 +1,74 @@
make-ldpc ldpc-144-72.pchk 72 144 1087 evenboth 3x3/7x4 no4cycle
Eliminated 259 cycles of length four by moving checks within column
#cp ldpc-144-72-6x3-4x4-sf1.pchk ldpc-144-72.pchk
make-gen ldpc-144-72.pchk ldpc-144-72.gen dense
Number of 1s per check in Inv(A) X B is 30.9
rand-src ldpc-144-72.src 1 72x1000000
encode ldpc-144-72.pchk ldpc-144-72.gen ldpc-144-72.src \
ldpc-144-72.enc
Encoded 1000000 blocks, source block size 72, encoded block size 144
# NOISE STANDARD DEVIATION 0.75, Eb/N0 = 2.50 dB
transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.75
Transmitted 144000000 bits
decode ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.75\
prprp 250
Decoded 1000000 blocks, 873685 valid. Average 37.9 iterations, 9% bit changes
verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
ldpc-144-72.src
Block counts: tot 1000000, with chk errs 126315, with src errs 126105, both 126091
Total good frames: 873671 Total undetected errors: 14
Bit error rate (on message bits only): 1.259e-02
# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dB
transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.80
Transmitted 144000000 bits
decode ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.80\
prprp 250
Decoded 1000000 blocks, 676606 valid. Average 86.8 iterations, 9% bit changes
verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
ldpc-144-72.src
Block counts: tot 1000000, with chk errs 323394, with src errs 322911, both 322888
Total good frames: 676583 Total undetected errors: 23
Bit error rate (on message bits only): 3.303e-02
# NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dB
transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.85
Transmitted 144000000 bits
decode ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.85\
prprp 250
Decoded 1000000 blocks, 429243 valid. Average 147.1 iterations, 9% bit changes
verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
ldpc-144-72.src
Block counts: tot 1000000, with chk errs 570757, with src errs 569982, both 569956
Total good frames: 429217 Total undetected errors: 26
Bit error rate (on message bits only): 6.138e-02
# NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dB
transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.90
Transmitted 144000000 bits
decode ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.90\
prprp 250
Decoded 1000000 blocks, 219252 valid. Average 197.8 iterations, 8% bit changes
verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
ldpc-144-72.src
Block counts: tot 1000000, with chk errs 780748, with src errs 779961, both 779939
Total good frames: 219230 Total undetected errors: 22
Bit error rate (on message bits only): 9.086e-02
# NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dB
transmit ldpc-144-72.enc ldpc-144-72.rec 1 awgn 0.95
Transmitted 144000000 bits
decode ldpc-144-72.pchk ldpc-144-72.rec ldpc-144-72.dec awgn 0.95\
prprp 250
Decoded 1000000 blocks, 89468 valid. Average 228.9 iterations, 7% bit changes
verify ldpc-144-72.pchk ldpc-144-72.dec ldpc-144-72.gen \
ldpc-144-72.src
Block counts: tot 1000000, with chk errs 910532, with src errs 909905, both 909896
Total good frames: 89459 Total undetected errors: 9
Bit error rate (on message bits only): 1.167e-01