From af03dbe6468a956972d80e11deb1120fe92de731 Mon Sep 17 00:00:00 2001
From: Steven Franke <s.j.franke@icloud.com>
Date: Tue, 26 Jan 2016 02:52:07 +0000
Subject: [PATCH] Code sf2 has better than 3x10^-5 undetected error rate.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6441 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
---
 lib/ldpc/jtmode_codes/ldpc-144-72             |   3 +-
 .../jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk | Bin 0 -> 2436 bytes
 lib/ldpc/jtmode_codes/ldpc-144-72-search      |   6 +-
 .../jtmode_codes/ldpc-144-72-sf2.results.txt  |  74 ++++++++++++++++++
 4 files changed, 79 insertions(+), 4 deletions(-)
 create mode 100644 lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk
 create mode 100644 lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt

diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72 b/lib/ldpc/jtmode_codes/ldpc-144-72
index df0b8faac..8c0adaa3b 100755
--- a/lib/ldpc/jtmode_codes/ldpc-144-72
+++ b/lib/ldpc/jtmode_codes/ldpc-144-72
@@ -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 \
diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk b/lib/ldpc/jtmode_codes/ldpc-144-72-3x3-7x4-sf2.pchk
new file mode 100644
index 0000000000000000000000000000000000000000..6dbb8f8f951c6aded01058944bb0d9793cd94b1d
GIT binary patch
literal 2436
zcmXZchf`Ho5P<O~7O<dLL1O_yv7u;U4}u5+DuRj{6%{PlMKt!H4?8O8pJVU6C)U_|
zOYA*rlJA?rncr-3ckj7-_MAsBHxS4S1OnUfAOC6*lQ0rRD8(B5OD>Yw9BKH@|F<H>
zV>s618_#MIL(vP%;QQtHO0F(30-ezXc__gK{6oG5u`7PWa(v-gDseC-ARm)38=uLA
z5qo0}7Goto@w^$a7z?lvKKC0R$<-!iU>tmBDa>ue2lDn1jwtj&e~ia8So5BmSYkWG
zBN5gtfjw`=J8GH`JHWmEgmn0=x8&*(?a_7GV=~I%8N4B%LbONswFqnBe79g5UQ-iC
zbWYAW8G~TWR=gsgO&pD}m<wlMt`aZFcPE;k2m5-#vzEjp3_~IQ=2;zLG^}?IGvRv9
z_Am0&iL<Jnd6w>@0?)~X5Zj^)`og+ZSPgr5Monv?bN(6LL)Uk|Ps#NlIy-ajZw#E#
z6LJlRuI(OX;4#naKLOUd)>L?IkH|G9wt#zcznkDJACik8cEkYqeP^-)56D#`x~6w9
z7yd3r!TaMZ?^EMhr@-&6fj!>id3|Cu`oZ3p;4aT2iO!@a+<O70pd5F|yXS#$583eE
z+3Rg`_UgIk!`T<%H>|@g@(qd3)Oouf@0P!po8+n!!{C|LMGTy+dn-g4oXZVr{l3qg
z#eDcX`W4s7ImfQB&q?rI_io)HY`~w?g%CsG96X!eu&1FIiwZcaYt+^t)<PmYPkRo+
zJAakD{WgVvbG#Sc#fhlI74mI}onT+ixfIT1JuZ{4Mr?#`aL@KI90l-O-p5PSr4n7&
zd*IwR<08*}w*&0|7kK`j^&jNIiRRlO0iJ6%JagyoeRr<EQ|l~ZU~L+*Faq;Xj0@Db
zhhFgSigzs!_T)LAC*Pdd8JY0i30MsG>%7iUQ->G_XJW7UD1ftdPiLudCN<%Ak}(9X
zSAjEC-|?P$-@L=_DF?am+`SK{sq;Q`hv$+4_vDPmqXeFZGdM+UZDImE2k*lIcxSx(
zC&{-V+J}3Z40Ay^>q?xU#(Uft_B;x6un>OZc-1#t$DTY3d!L3Pxc_B1MxFQV2eg89
z-U<IcxIfo)-equJN2#wzY=S5Zf_t2T>2MY+aiprQ0srl9&^4WvXX|%YU@Z<)=RTaj
zwH=Xyk?^<Snx5$@9HO=%F$wN>F8rSBncsqg)U+mcf_un89_-JWAP!LD8F{zT;Qe>6
z&SpNmqn`bK>Y5UxF%Z_d*X1Zh5c{aHr%3p_@O$>|na_gjdA7c@m)cNbGbF-&cy{(+
zy=QHoQ{jA^`!?+1y)dG)@jZJ<M;5#z?r#hV;5VJ?Zr<@s+oK!$U<4+@^Y@<kja}4*
z6RmBFc%;I0oqsV(uny(eNqq=03bBZT>-U52Wx&1)v4dLgr!$O!y?EEX57y;iH2h8a
F?|&tKwh90M

literal 0
HcmV?d00001

diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72-search b/lib/ldpc/jtmode_codes/ldpc-144-72-search
index 812ed0d86..72674febc 100755
--- a/lib/ldpc/jtmode_codes/ldpc-144-72-search
+++ b/lib/ldpc/jtmode_codes/ldpc-144-72-search
@@ -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
\ No newline at end of file
+done
diff --git a/lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt b/lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt
new file mode 100644
index 000000000..36fa99be9
--- /dev/null
+++ b/lib/ldpc/jtmode_codes/ldpc-144-72-sf2.results.txt
@@ -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
\ No newline at end of file