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https://github.com/saitohirga/WSJT-X.git
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381 lines
11 KiB
Fortran
381 lines
11 KiB
Fortran
subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
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napwid,lsubtract,nagain,iaptype,mycall12,mygrid6,hiscall12,bcontest, &
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sync0,f1,xdt,xbase,apsym,nharderrors,dmin,nbadcrc,ipass,iera,msg37,xsnr)
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use crc
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use timer_module, only: timer
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include 'ft8_params.f90'
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parameter(NP2=2812)
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character*37 msg37
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character message*22,msgsent*22
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character*12 mycall12,hiscall12
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character*6 mycall6,mygrid6,hiscall6,c1,c2
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character*87 cbits
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logical bcontest
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real a(5)
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real s1(0:7,ND),s2(0:7,NN),s1sort(8*ND)
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real ps(0:7),psl(0:7)
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real bmeta(3*ND),bmetb(3*ND),bmetap(3*ND)
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real llr(3*ND),llra(3*ND),llrb(3*ND),llrd(3*ND) !Soft symbols
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real dd0(15*12000)
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integer*1 decoded(91),decoded0(91),apmask(3*ND),cw(3*ND)
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integer*1 msgbits(91)
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integer apsym(91)
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integer mcq(28),mde(28),mrrr(16),m73(16),mrr73(16)
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integer itone(NN)
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integer indxs1(8*ND)
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integer icos7(0:6),ip(1)
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integer nappasses(0:5) !Number of decoding passes to use for each QSO state
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integer naptypes(0:5,4) ! (nQSOProgress, decoding pass) maximum of 4 passes for now
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integer*1, target:: i1hiscall(12)
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complex cd0(3200)
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complex ctwk(32)
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complex csymb(32)
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logical first,newdat,lsubtract,lapon,lapcqonly,nagain
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equivalence (s1,s1sort)
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data icos7/3,1,4,0,6,5,2/ ! Flipped w.r.t. original FT8 sync array
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data mcq/1,1,1,1,1,0,1,0,0,0,0,0,1,0,0,0,0,0,1,1,0,0,0,1,1,0,0,1/
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data mrrr/0,1,1,1,1,1,1,0,1,1,0,0,1,1,1,1/
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data m73/0,1,1,1,1,1,1,0,1,1,0,1,0,0,0,0/
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data mde/1,1,1,1,1,1,1,1,0,1,1,0,0,1,0,0,0,0,0,1,1,1,0,1,0,0,0,1/
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data mrr73/0,0,0,0,0,0,1,0,0,0,0,1,0,1,0,1/
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data first/.true./
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save nappasses,naptypes
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! All of the AP-related code in this routine needs to be re-written! AP decoding
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! passes are disabled for now.
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!
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if(first) then
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mcq=2*mcq-1
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mde=2*mde-1
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mrrr=2*mrrr-1
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m73=2*m73-1
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mrr73=2*mrr73-1
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nappasses(0)=2
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nappasses(1)=2
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nappasses(2)=2
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nappasses(3)=4
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nappasses(4)=4
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nappasses(5)=3
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! iaptype
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!------------------------
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! 1 CQ ??? ???
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! 2 MyCall ??? ???
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! 3 MyCall DxCall ???
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! 4 MyCall DxCall RRR
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! 5 MyCall DxCall 73
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! 6 MyCall DxCall RR73
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! 7 ??? DxCall ???
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naptypes(0,1:4)=(/1,2,0,0/)
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naptypes(1,1:4)=(/2,3,0,0/)
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naptypes(2,1:4)=(/2,3,0,0/)
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naptypes(3,1:4)=(/3,4,5,6/)
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naptypes(4,1:4)=(/3,4,5,6/)
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naptypes(5,1:4)=(/3,1,2,0/)
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first=.false.
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endif
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max_iterations=30
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nharderrors=-1
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fs2=12000.0/NDOWN
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dt2=1.0/fs2
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twopi=8.0*atan(1.0)
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delfbest=0.
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ibest=0
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call timer('ft8_down',0)
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call ft8_downsample(dd0,newdat,f1,cd0) !Mix f1 to baseband and downsample
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call timer('ft8_down',1)
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i0=nint((xdt+0.5)*fs2) !Initial guess for start of signal
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smax=0.0
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do idt=i0-8,i0+8 !Search over +/- one quarter symbol
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call sync8d(cd0,idt,ctwk,0,2,sync)
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if(sync.gt.smax) then
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smax=sync
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ibest=idt
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endif
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enddo
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xdt2=ibest*dt2 !Improved estimate for DT
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! Now peak up in frequency
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i0=nint(xdt2*fs2)
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smax=0.0
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do ifr=-5,5 !Search over +/- 2.5 Hz
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delf=ifr*0.5
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dphi=twopi*delf*dt2
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phi=0.0
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do i=1,32
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ctwk(i)=cmplx(cos(phi),sin(phi))
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phi=mod(phi+dphi,twopi)
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enddo
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call sync8d(cd0,i0,ctwk,1,2,sync)
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if( sync .gt. smax ) then
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smax=sync
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delfbest=delf
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endif
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enddo
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a=0.0
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a(1)=-delfbest
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call twkfreq1(cd0,NP2,fs2,a,cd0)
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xdt=xdt2
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f1=f1+delfbest !Improved estimate of DF
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call sync8d(cd0,i0,ctwk,2,2,sync)
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j=0
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do k=1,NN
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i1=ibest+(k-1)*32
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csymb=cmplx(0.0,0.0)
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if( i1.ge.1 .and. i1+31 .le. NP2 ) csymb=cd0(i1:i1+31)
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call four2a(csymb,32,1,-1,1)
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s2(0:7,k)=abs(csymb(1:8))/1e3
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enddo
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! sync quality check
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is1=0
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is2=0
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is3=0
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do k=1,7
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ip=maxloc(s2(:,k))
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if(icos7(k-1).eq.(ip(1)-1)) is1=is1+1
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ip=maxloc(s2(:,k+36))
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if(icos7(k-1).eq.(ip(1)-1)) is2=is2+1
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ip=maxloc(s2(:,k+72))
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if(icos7(k-1).eq.(ip(1)-1)) is3=is3+1
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enddo
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! hard sync sum - max is 21
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nsync=is1+is2+is3
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if(nsync .le. 6) then ! bail out
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nbadcrc=1
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return
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endif
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j=0
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do k=1,NN
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if(k.le.7) cycle
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if(k.ge.37 .and. k.le.43) cycle
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if(k.gt.72) cycle
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j=j+1
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s1(0:7,j)=s2(0:7,k)
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enddo
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call indexx(s1sort,8*ND,indxs1)
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xmeds1=s1sort(indxs1(nint(0.5*8*ND)))
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s1=s1/xmeds1
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do j=1,ND
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i4=3*j-2
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i2=3*j-1
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i1=3*j
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! Max amplitude
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ps=s1(0:7,j)
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! For Gray bit-to-symbol mapping
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r1=max(ps(1),ps(2),ps(5),ps(6))-max(ps(0),ps(3),ps(4),ps(7))
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r2=max(ps(2),ps(3),ps(4),ps(5))-max(ps(0),ps(1),ps(6),ps(7))
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r4=max(ps(4),ps(5),ps(6),ps(7))-max(ps(0),ps(1),ps(2),ps(3))
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bmeta(i4)=r4
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bmeta(i2)=r2
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bmeta(i1)=r1
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! Max log metric
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psl=log(ps+1e-32)
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! Gray bit-to-symbol mapping
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r1=max(psl(1),psl(2),psl(5),psl(6))-max(psl(0),psl(3),psl(4),ps(7))
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r2=max(psl(2),psl(3),psl(4),psl(5))-max(psl(0),psl(1),psl(6),ps(7))
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r4=max(psl(4),psl(5),psl(6),psl(7))-max(psl(0),psl(1),psl(2),ps(3))
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bmetb(i4)=r4
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bmetb(i2)=r2
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bmetb(i1)=r1
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enddo
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call normalizebmet(bmeta,3*ND)
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call normalizebmet(bmetb,3*ND)
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bmetap=bmeta
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scalefac=2.83
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llra=scalefac*bmeta
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llrb=scalefac*bmetb
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apmag=scalefac*(maxval(abs(bmetap))*1.01)
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! pass #
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!------------------------------
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! 1 regular decoding
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! 2 erase 24
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! 3 erase 48
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! 4 ap pass 1
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! 5 ap pass 2
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! 6 ap pass 3
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! 7 ap pass 4, etc.
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if(lapon) then
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if(.not.lapcqonly) then
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npasses=4+nappasses(nQSOProgress)
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else
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npasses=5
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endif
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else
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npasses=4
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endif
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do ipass=1,npasses
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! do ipass=1,2
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llrd=llra
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if(ipass.eq.2) llrd=llrb
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if(ipass.eq.3) llrd(1:24)=0.
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if(ipass.eq.4) llrd(1:48)=0.
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if(ipass.le.4) then
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apmask=0
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iaptype=0
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endif
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if(ipass .gt. 4) then
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if(.not.lapcqonly) then
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iaptype=naptypes(nQSOProgress,ipass-4)
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else
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iaptype=1
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endif
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if(iaptype.ge.3 .and. (abs(f1-nfqso).gt.napwid .and. abs(f1-nftx).gt.napwid) ) cycle
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if(iaptype.eq.1 .or. iaptype.eq.2 ) then ! AP,???,???
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apmask=0
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apmask(1:27)=1 ! first 27 bits (9 tones) are AP
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if(iaptype.eq.1) llrd(1:27)=apmag*mcq(1:27)
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if(iaptype.eq.2) llrd(1:27)=apmag*apsym(1:27)
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endif
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if(iaptype.eq.3) then ! mycall, dxcall, ???
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apmask=0
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apmask(1:54)=1
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llrd(1:54)=apmag*apsym(1:54)
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endif
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if(iaptype.eq.4 .or. iaptype.eq.5 .or. iaptype.eq.6) then
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apmask=0
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apmask(1:72)=1 ! mycall, hiscall, RRR|73|RR73
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llrd(1:56)=apmag*apsym(1:56)
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if(iaptype.eq.4) llrd(57:72)=apmag*mrrr
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if(iaptype.eq.5) llrd(57:72)=apmag*m73
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if(iaptype.eq.6) llrd(57:72)=apmag*mrr73
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endif
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if(iaptype.eq.7) then ! ???, dxcall, ???
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apmask=0
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apmask(31:54)=1 ! hiscall
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llrd(31:54)=apmag*apsym(31:54)
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endif
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endif
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cw=0
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call timer('bpd174_91 ',0)
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call bpdecode174_91(llrd,apmask,max_iterations,decoded,cw,nharderrors, &
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niterations)
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call timer('bpd174_91 ',1)
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dmin=0.0
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if(ndepth.eq.3 .and. nharderrors.lt.0) then
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ndeep=3
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if(abs(nfqso-f1).le.napwid .or. abs(nftx-f1).le.napwid) then
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if((ipass.eq.3 .or. ipass.eq.4) .and. .not.nagain) then
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ndeep=3
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else
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ndeep=4
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endif
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endif
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if(nagain) ndeep=5
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call timer('osd174_91 ',0)
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call osd174_91(llrd,apmask,ndeep,decoded,cw,nharderrors,dmin)
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call timer('osd174_91 ',1)
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endif
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nbadcrc=1
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message=' '
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xsnr=-99.0
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if(count(cw.eq.0).eq.174) cycle !Reject the all-zero codeword
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if(nharderrors.ge.0 .and. nharderrors+dmin.lt.60.0 .and. &
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.not.(sync.lt.2.0 .and. nharderrors.gt.35) .and. &
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.not.(ipass.gt.2 .and. nharderrors.gt.39) .and. &
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.not.(ipass.eq.4 .and. nharderrors.gt.30) &
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) then
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call chkcrc14a(decoded,nbadcrc)
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else
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nharderrors=-1
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cycle
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endif
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i5bit=16*decoded(73) + 8*decoded(74) + 4*decoded(75) + 2*decoded(76) + decoded(77)
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iFreeText=decoded(57)
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if(nbadcrc.eq.0) then
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decoded0=decoded
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if(i5bit.eq.1) decoded(57:)=0
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call extractmessage174_91(decoded,message,ncrcflag)
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decoded=decoded0
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! This needs fixing for messages with i5bit=1:
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call genft8_174_91(message,mygrid6,bcontest,i5bit,msgsent,msgbits,itone)
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if(lsubtract) call subtractft8(dd0,itone,f1,xdt2)
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xsig=0.0
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xnoi=0.0
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do i=1,79
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xsig=xsig+s2(itone(i),i)**2
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ios=mod(itone(i)+4,7)
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xnoi=xnoi+s2(ios,i)**2
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enddo
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xsnr=0.001
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if(xnoi.gt.0 .and. xnoi.lt.xsig) xsnr=xsig/xnoi-1.0
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xsnr=10.0*log10(xsnr)-27.0
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xsnr2=db(xsig/xbase - 1.0) - 32.0
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if(.not.nagain) xsnr=xsnr2
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if(xsnr .lt. -24.0) xsnr=-24.0
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if(i5bit.eq.1) then
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do i=1,12
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i1hiscall(i)=ichar(hiscall12(i:i))
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enddo
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icrc10=crc10(c_loc(i1hiscall),12)
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write(cbits,1001) decoded
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1001 format(87i1)
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read(cbits,1002) ncrc10,nrpt
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1002 format(56x,b10,b6)
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irpt=nrpt-30
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i1=index(message,' ')
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i2=index(message(i1+1:),' ') + i1
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c1=message(1:i1)//' '
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c2=message(i1+1:i2)//' '
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if(ncrc10.eq.icrc10) msg37=c1//' RR73; '//c2//' <'// &
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trim(hiscall12)//'> '
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if(ncrc10.ne.icrc10) msg37=c1//' RR73; '//c2//' <...> '
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! msg37=c1//' RR73; '//c2//' <...> '
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write(msg37(35:37),1010) irpt
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1010 format(i3.2)
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if(msg37(35:35).ne.'-') msg37(35:35)='+'
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iz=len(trim(msg37))
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do iter=1,10 !Collapse multiple blanks
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ib2=index(msg37(1:iz),' ')
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if(ib2.lt.1) exit
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msg37=msg37(1:ib2)//msg37(ib2+2:)
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iz=iz-1
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enddo
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else
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msg37=message//' '
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endif
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return
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endif
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enddo
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return
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end subroutine ft8b_2
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! This currently resides in ft8b_1.f90
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!subroutine normalizebmet(bmet,n)
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! real bmet(n)
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!
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! bmetav=sum(bmet)/real(n)
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! bmet2av=sum(bmet*bmet)/real(n)
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! var=bmet2av-bmetav*bmetav
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! if( var .gt. 0.0 ) then
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! bmetsig=sqrt(var)
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! else
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! bmetsig=sqrt(bmet2av)
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! endif
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! bmet=bmet/bmetsig
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! return
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!end subroutine normalizebmet
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