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Speedup msk40 and suppress spurious Eve decodes. 

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6975 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-07-30 16:06:08 +00:00
parent df4dd69bf4
commit 548c5e8cdc
1 changed files with 9 additions and 5 deletions
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14
lib/detectmsk40.f90
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@ -1,7 +1,7 @@
subroutine detectmsk40(cbig,n,mycall,hiscall,lines,nmessages,nutc,ntol,t00)
use timer_module, only: timer
parameter (NSPM=240, NPTS=3*NSPM, MAXSTEPS=7500, NFFT=3*NSPM, MAXCAND=40)
parameter (NSPM=240, NPTS=3*NSPM, MAXSTEPS=7500, NFFT=3*NSPM, MAXCAND=15)
character*4 rpt(0:63)
character*6 mycall,hiscall
character*22 hashmsg,msgreceived
@ -283,7 +283,7 @@ subroutine detectmsk40(cbig,n,mycall,hiscall,lines,nmessages,nutc,ntol,t00)
ferr2=atan2(imag(cfac),real(cfac))/(twopi*40*6*dt)
endif
do idf=0,6 ! frequency jitter
do idf=0,2 ! frequency jitter
if( idf .eq. 0 ) then
deltaf=0.0
elseif( mod(idf,2) .eq. 0 ) then
@ -366,8 +366,12 @@ subroutine detectmsk40(cbig,n,mycall,hiscall,lines,nmessages,nutc,ntol,t00)
if( niterations .ge. 0 ) then
call ldpc_encode(decoded,cw)
nhammd=0
cord=0.0
do i=1,32
if( cw(i) .ne. hardbits(i+8) ) nhammd=nhammd+1
if( cw(i) .ne. hardbits(i+8) ) then
nhammd=nhammd+1
cord=cord+abs(softbits(i+8))
endif
enddo
imsg=0
@ -376,9 +380,9 @@ subroutine detectmsk40(cbig,n,mycall,hiscall,lines,nmessages,nutc,ntol,t00)
enddo
nrxrpt=iand(imsg,63)
nrxhash=(imsg-nrxrpt)/64
if( nrxhash .eq. nhashes(nrxrpt) ) then
if( nhammd .le. 5 .and. cord .lt. 1.7 .and. nrxhash .eq. nhashes(nrxrpt) ) then
fest=1500+ferr+ferr2+deltaf
write(14,'(i6.6,11i5)') nutc,ip,ipk,id,idf,iav,ipha,niterations,nbadsync,nrxrpt,ncalls,nhammd
!write(14,'(i6.6,11i6,f7.1)') nutc,ip,ipk,id,idf,iav,ipha,niterations,nbadsync,nrxrpt,ncalls,nhammd,cord
nhashflag=1
msgreceived=' '
nmessages=1