mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-22 04:11:16 -05:00
Working code for FT8 'a7' decodes. Still needs some cleanup.
This commit is contained in:
Joe Taylor
parent
5b406effcf
commit
393265a0e0
@ -422,10 +422,9 @@ set (wsjt_FSRCS
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lib/freqcal.f90
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lib/ft8/ft8apset.f90
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lib/ft8/ft8b.f90
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lib/ft8/ft8c.f90
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lib/ft8/ft8code.f90
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lib/ft8/ft8_downsample.f90
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lib/ft8/ft8q3.f90
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lib/ft8/test_ft8q3.f90
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lib/ft8/ft8sim.f90
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lib/gen4.f90
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lib/gen65.f90
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@ -1180,9 +1179,6 @@ target_link_libraries (ft4code wsjt_fort wsjt_cxx)
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add_executable (ft8sim lib/ft8/ft8sim.f90)
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target_link_libraries (ft8sim wsjt_fort wsjt_cxx)
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add_executable (test_ft8q3 lib/ft8/test_ft8q3.f90)
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target_link_libraries (test_ft8q3 wsjt_fort wsjt_cxx)
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add_executable (msk144sim lib/msk144sim.f90)
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target_link_libraries (msk144sim wsjt_fort wsjt_cxx)
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264
lib/ft8/ft8c.f90
Normal file
264
lib/ft8/ft8c.f90
Normal file
@ -0,0 +1,264 @@
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subroutine ft8c(dd0,newdat,call_1,call_2,grid4,f1,xdt,nharderrors,dmin,msg37,xsnr)
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use crc
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use timer_module, only: timer
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use packjt77
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include 'ft8_params.f90'
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parameter(NP2=2812)
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character*37 msg37,msg,msgsent,msgbest
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character*12 call_1,call_2
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character*4 grid4
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real a(5)
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real s8(0:7,NN)
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real s2(0:511)
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real bmeta(174),bmetb(174),bmetc(174),bmetd(174)
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real llra(174),llrb(174),llrc(174),llrd(174),llrbest(174) !Soft symbols
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real dd0(15*12000)
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real ss(9)
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real rcw(174)
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integer*1 cw(174)
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integer*1 msgbits(77)
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integer*1 nxor(174),hdec(174)
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integer itone(NN)
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integer icos7(0:6),ip(1)
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logical one(0:511,0:8)
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integer graymap(0:7)
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integer iloc(1)
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complex cd0(0:3199)
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complex ctwk(32)
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complex csymb(32)
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complex cs(0:7,NN)
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logical std_1,std_2
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logical first,newdat
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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 first/.true./
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data graymap/0,1,3,2,5,6,4,7/
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save one
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if(first) then
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one=.false.
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do i=0,511
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do j=0,8
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if(iand(i,2**j).ne.0) one(i,j)=.true.
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enddo
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enddo
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first=.false.
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endif
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call stdcall(call_1,std_1)
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if(call_1(1:3).eq.'CQ ') std_1=.true.
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call stdcall(call_2,std_2)
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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=i0-10,i0+10 !Search over +/- one quarter symbol
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call sync8d(cd0,idt,ctwk,0,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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! Now peak up in frequency
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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,ibest,ctwk,1,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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f1=f1+delfbest !Improved estimate of DF
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call timer('ft8_down',0)
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call ft8_downsample(dd0,.false.,f1,cd0) !Mix f1 to baseband and downsample
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call timer('ft8_down',1)
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smax=0.0
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do idt=-4,4 !Search over +/- one quarter symbol
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call sync8d(cd0,ibest+idt,ctwk,0,sync)
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ss(idt+5)=sync
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enddo
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smax=maxval(ss)
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iloc=maxloc(ss)
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ibest=iloc(1)-5+ibest
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xdt=(ibest-1)*dt2 - 0.5
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sync=smax
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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.0 .and. i1+31 .le. NP2-1 ) csymb=cd0(i1:i1+31)
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call four2a(csymb,32,1,-1,1)
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cs(0:7,k)=csymb(1:8)/1e3
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s8(0:7,k)=abs(csymb(1:8))
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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(s8(:,k))
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if(icos7(k-1).eq.(ip(1)-1)) is1=is1+1
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ip=maxloc(s8(:,k+36))
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if(icos7(k-1).eq.(ip(1)-1)) is2=is2+1
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ip=maxloc(s8(:,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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do nsym=1,3
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nt=2**(3*nsym)
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do ihalf=1,2
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do k=1,29,nsym
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if(ihalf.eq.1) ks=k+7
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if(ihalf.eq.2) ks=k+43
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amax=-1.0
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do i=0,nt-1
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i1=i/64
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i2=iand(i,63)/8
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i3=iand(i,7)
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if(nsym.eq.1) then
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s2(i)=abs(cs(graymap(i3),ks))
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elseif(nsym.eq.2) then
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s2(i)=abs(cs(graymap(i2),ks)+cs(graymap(i3),ks+1))
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elseif(nsym.eq.3) then
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s2(i)=abs(cs(graymap(i1),ks)+cs(graymap(i2),ks+1)+cs(graymap(i3),ks+2))
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else
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print*,"Error - nsym must be 1, 2, or 3."
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endif
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enddo
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i32=1+(k-1)*3+(ihalf-1)*87
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if(nsym.eq.1) ibmax=2
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if(nsym.eq.2) ibmax=5
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if(nsym.eq.3) ibmax=8
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do ib=0,ibmax
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bm=maxval(s2(0:nt-1),one(0:nt-1,ibmax-ib)) - &
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maxval(s2(0:nt-1),.not.one(0:nt-1,ibmax-ib))
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if(i32+ib .gt.174) cycle
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if(nsym.eq.1) then
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bmeta(i32+ib)=bm
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den=max(maxval(s2(0:nt-1),one(0:nt-1,ibmax-ib)), &
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maxval(s2(0:nt-1),.not.one(0:nt-1,ibmax-ib)))
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if(den.gt.0.0) then
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cm=bm/den
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else ! erase it
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cm=0.0
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endif
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bmetd(i32+ib)=cm
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elseif(nsym.eq.2) then
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bmetb(i32+ib)=bm
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elseif(nsym.eq.3) then
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bmetc(i32+ib)=bm
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endif
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enddo
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enddo
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enddo
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enddo
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call normalizebmet(bmeta,174)
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call normalizebmet(bmetb,174)
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call normalizebmet(bmetc,174)
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call normalizebmet(bmetd,174)
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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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llrc=scalefac*bmetc
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llrd=scalefac*bmetd
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! apmag=maxval(abs(llra))*1.01
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MAXMSG=206
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pbest=0.
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do imsg=1,MAXMSG
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msg=trim(call_1)//' '//trim(call_2)
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i=imsg
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if(call_1(1:3).eq.'CQ ' .and. i.ne.5) msg='QQ0XYZ '//trim(call_2)
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if(.not.std_1) then
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if(i.eq.1 .or. i.ge.6) msg='<'//trim(call_1)//'> '//trim(call_2)
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if(i.ge.2 .and. i.le.4) msg=trim(call_1)//' <'//trim(call_2)//'>'
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else if(.not.std_2) then
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if(i.le.4 .or. i.eq.6) msg='<'//trim(call_1)//'> '//trim(call_2)
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if(i.ge.7) msg=trim(call_1)//' <'//trim(call_2)//'>'
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endif
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j0=len(trim(msg))+2
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if(i.eq.2) msg(j0:j0+2)='RRR'
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if(i.eq.3) msg(j0:j0+3)='RR73'
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if(i.eq.4) msg(j0:j0+1)='73'
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if(i.eq.5) then
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if(std_2) then
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msg='CQ '//trim(call_2)
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if(call_1(3:3).eq.'_') msg=trim(call_1)//' '//trim(call_2)
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if(grid4.ne.'RR73') msg=trim(msg)//' '//grid4
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endif
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if(.not.std_2) msg='CQ '//trim(call_2)
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endif
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if(i.eq.6 .and. std_2) msg(j0:j0+3)=grid4
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if(i.ge.7) then
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isnr = -50 + (i-7)/2
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if(iand(i,1).eq.1) then
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write(msg(j0:j0+2),'(i3.2)') isnr
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if(msg(j0:j0).eq.' ') msg(j0:j0)='+'
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else
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write(msg(j0:j0+3),'("R",i3.2)') isnr
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if(msg(j0+1:j0+1).eq.' ') msg(j0+1:j0+1)='+'
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endif
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endif
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! Source-encode, then get codeword
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i3=-1
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n3=-1
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call genft8(msg,i3,n3,msgsent,msgbits,itone)
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call encode174_91(msgbits,cw)
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rcw=2*cw-1
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pa=sum(llra*rcw)
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pb=sum(llrb*rcw)
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pc=sum(llrc*rcw)
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pd=sum(llrd*rcw)
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if(pa.gt.pbest) then
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pbest=pa
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msgbest=msgsent
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llrbest=llra
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nharderrors=count((2*cw-1)*llra.lt.0.0)
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hdec=0
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where(llra.ge.0.0) hdec=1
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nxor=ieor(hdec,cw)
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dmin=sum(nxor*abs(llra))
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endif
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enddo ! imsg
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! write(*,4001) pbest,nharderrors,dmin,trim(msgbest)
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!4001 format('$$$',f7.1,i4,f7.1,2x,a)
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msg37=msgbest
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return
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end subroutine ft8c
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@ -108,10 +108,10 @@ subroutine ft8q3(cd,xdt,f0,call_1,call_2,grid4,msgbest,snr)
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call pctile(ccfmsg,207,67,sigma)
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sigma=sigma-base
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ccfmsg=(ccfmsg-base)/(2.5*sigma)
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do imsg=1,207
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write(44,3044) imsg,ccfmsg(imsg)
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3044 format(i5,f10.3)
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enddo
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! do imsg=1,207
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! write(44,3044) imsg,ccfmsg(imsg)
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!3044 format(i5,f10.3)
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! enddo
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snr=maxval(ccfmsg)
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return
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@ -54,7 +54,8 @@ contains
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logical newdat,lsubtract,ldupe,lrefinedt
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logical*1 ldiskdat
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logical lsubtracted(MAX_EARLY)
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character*12 mycall12,hiscall12
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character*12 mycall12,hiscall12,call_1,call_2
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character*4 grid4
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integer*2 iwave(15*12000)
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integer apsym2(58),aph10(10)
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character datetime*13,msg37*37
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@ -65,7 +66,6 @@ contains
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integer itone_save(NN,MAX_EARLY)
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real f1_save(MAX_EARLY)
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real xdt_save(MAX_EARLY)
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complex cd0(0:3199)
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data nutc0/-1/
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save s,dd,dd1,nutc0,ndec_early,itone_save,f1_save,xdt_save,lsubtracted,&
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@ -232,35 +232,40 @@ contains
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900 continue
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! if(nzhsym.eq.50) print*,'AA0',jseq,ndec(0,0),ndec(0,1)
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if(nzhsym.eq.50 .and. ndec(jseq,0).ge.1) then
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call timer('ft8_dec7',0)
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newdat=.true.
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write(44,*) 'BBB',nutc
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do i=1,ndec(jseq,0)
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if(f0(i,jseq,0).eq.-99.0) exit
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if(f0(i,jseq,0).eq.-98.0) cycle
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if(index(msg0(i,jseq,0),'<').ge.1) cycle !### Temporary ###
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call ft8_downsample(dd,newdat,f0(i,jseq,0),cd0)
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call ft8_dec7(cd0,dt0(i,jseq,0),f0(i,jseq,0),msg0(i,jseq,0), &
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xdt,xsnr,msg37,snr7,snr7b)
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ddt=xdt-dt0(i,jseq,0)
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! write(41,3041) nutc,snr7,snr7b,xdt,ddt,nint(f0(i,jseq,0)),trim(msg37)
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!3041 format(i6.6,4f7.2,i5,2x,a)
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if(snr7.lt.6.0 .or. snr7b.lt.1.8) cycle
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! write(42,3041) nutc,snr7,snr7b,xdt,ddt,nint(f0(i,jseq,0)),trim(msg37)
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! flush(41)
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! flush(42)
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if(associated(this%callback)) then
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nsnr=xsnr
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f1=f0(i,jseq,0)
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iaptype=7
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qual=1.0
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call this%callback(sync,nsnr,xdt,f1,msg37,iaptype,qual)
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! Call subtract here?
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call subtractft8(dd,itone_a7,f1,xdt+0.5,.false.) !### ??? ###
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msg37=msg0(i,jseq,0)
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i1=index(msg37,' ')
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i2=index(msg37(i1+1:),' ') + i1
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call_1=msg37(1:i1-1)
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call_2=msg37(i1+1:i2-1)
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grid4=msg37(i2+1:i2+4)
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if(grid4.eq.'RR73' .or. index(grid4,'+').gt.0 .or. &
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index(grid4,'-').gt.0) grid4=' '
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! print*,'aa ',call_1,call_2,grid4,' ',msg37
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msg37=' '
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xdt=dt0(i,jseq,0)
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f1=f0(i,jseq,0)
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write(50,3050) i,sum(dd),newdat,mycall12,hiscall12,xdt,f1
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3050 format(i3,f10.3,L3,2x,2a12,f7.2,f7.1)
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call timer('ft8c ',0)
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call ft8c(dd,newdat,call_1,call_2,grid4,f1,xdt,nharderrors,dmin,msg37,xsnr)
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call timer('ft8c ',1)
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if(nharderrors.ge.0 .and. nharderrors.le.44 .and. dmin.le.80.0) then
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if(associated(this%callback)) then
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nsnr=xsnr
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iaptype=7
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qual=1.0
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call this%callback(sync,nsnr,xdt,f1,msg37,iaptype,qual)
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endif
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! write(*,3901) xdt,nint(f1),nharderrors,dmin,trim(msg37)
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!3901 format('$$$',f6.1,i5,i5,f7.1,1x,a)
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endif
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! newdat=.false.
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enddo
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call timer('ft8_dec7',1)
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endif
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return
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