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Update to likelihood ratio dither approach.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6635 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-04-23 17:33:13 +00:00
parent 3c3a84f7c9
commit 334bb67208
2 changed files with 5 additions and 5 deletions
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8
lib/ldpc/dec.c
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@ -395,11 +395,11 @@ void ldpc_decode_ ( double lratio[], char decoded[], int *max_iterations, int *n
for (itry=0; itry< *max_dither; itry++) { for (itry=0; itry< *max_dither; itry++) {
for (i=0; i<N; i++) { for (i=0; i<N; i++) {
if( itry == 0 ) { if( itry == 0 ) {
fac=1.0; fac=0.0;
} else { } else {
fac=1.0+0.8*(rand()%1024-512)/512.0; fac=(rand()%1024-512)/512.0;
} }
lr[i]=lratio[i]*fac; lr[i]=lratio[i]*exp(fac);
} }
*niterations = prprp_decode ( H, lr, dblk, pchk, bprb ); *niterations = prprp_decode ( H, lr, dblk, pchk, bprb );
valid = check( H, dblk, pchk )==0; valid = check( H, dblk, pchk )==0;

2
lib/ldpc/peg/DenEvl_9.deg
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@ -1,3 +1,3 @@
3 3
2 2 9 2 3 9
0.491281 0.335305 0.173414 0.491281 0.335305 0.173414