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Fix sigma ramp-up for short messages in msk40. Should decrease false decodes. 

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7050 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-09-01 16:08:23 +00:00
parent 5eaeeb6469
commit 6a7a9ce6bf
1 changed files with 1 additions and 1 deletions
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lib/detectmsk40.f90
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@ -378,7 +378,7 @@ subroutine detectmsk40(cbig,n,pchk_file,mycall,hiscall,lines,nmessages, &
softbits=softbits/ssig
sigma=0.75
if(xsnr.lt.1.5) sigma=1.1 - 0.0875*(xsnr+4.0)
if(xsnr.lt.0.0) sigma=0.75-0.0875*xsnr
lratio(1:32)=exp(2.0*softbits(9:40)/(sigma*sigma)) ! Use this for Radford Neal's routines
llr(1:32)=2.0*softbits(9:40)/(sigma*sigma) ! Use log likelihood for bpdecode40