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https://github.com/saitohirga/WSJT-X.git
synced 2024-11-01 08:07:10 -04:00
a7c6f42ba4
includes an initial implementation of the FTRSD decoder with a "qual" parameter for evaluation of candidate codewords. Also includes hinted decoding. Further testing is needed. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6278 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
169 lines
4.2 KiB
Fortran
169 lines
4.2 KiB
Fortran
subroutine exp_decode65(s3,mrs,mrs2,mrsym,mr2sym,mrprob,mode65,flip, &
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mycall,qual,decoded)
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use packjt
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use prog_args
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parameter (NMAX=10000)
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real s3(64,63)
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real pp(NMAX),bb(NMAX)
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integer*1 sym1(0:62,NMAX)
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integer*1 sym2(0:62,NMAX)
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integer mrs(63),mrs2(63)
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integer mrsym(0:62),mr2sym(0:62),mrprob(0:62)
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integer dgen(12),sym(0:62),sym_rev(0:62)
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integer test(0:62)
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character*6 mycall,hiscall(NMAX)
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character*4 hisgrid(NMAX)
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character callsign*12,grid*4
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character*180 line
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character ceme*3,msg*22
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character*22 msg0(1000),decoded
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logical*1 eme(NMAX)
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logical first
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data first/.true./,nn/0/
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save first,sym1,nused,msg0,sym2,nn
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if(first) then
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neme=1
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open(23,file=trim(data_dir)//'/CALL3.TXT',status='unknown')
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icall=0
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j=0
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do i=1,NMAX
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read(23,1002,end=10) line
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1002 format(a80)
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if(line(1:4).eq.'ZZZZ') cycle
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if(line(1:2).eq.'//') cycle
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i1=index(line,',')
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if(i1.lt.4) cycle
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i2=index(line(i1+1:),',')
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if(i2.lt.5) cycle
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i2=i2+i1
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i3=index(line(i2+1:),',')
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if(i3.lt.1) i3=index(line(i2+1:),' ')
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i3=i2+i3
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callsign=line(1:i1-1)
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grid=line(i1+1:i2-1)
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ceme=line(i2+1:i3-1)
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eme(i)=ceme.eq.'EME'
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if(neme.eq.1 .and. (.not.eme(i))) cycle
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j=j+1
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hiscall(j)=callsign(1:6) !### Fix for compound callsigns!
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hisgrid(j)=grid
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enddo
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10 ncalls=j
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close(23)
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j=0
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do i=1,ncalls
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if(neme.eq.1 .and. (.not.eme(i))) cycle
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!### Special for tests ###
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do isnr=-20,-30,-1
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j=j+1
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msg=mycall//' '//hiscall(i)//' '//hisgrid(i)
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if(isnr.ne.-20) write(msg(14:18),"(i3,' ')") isnr
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call fmtmsg(msg,iz)
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call packmsg(msg,dgen,itype) !Pack message into 72 bits
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call rs_encode(dgen,sym_rev) !RS encode
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sym(0:62)=sym_rev(62:0:-1)
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sym1(0:62,j)=sym
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call interleave63(sym_rev,1) !Interleave channel symbols
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call graycode(sym_rev,63,1,sym_rev) !Apply Gray code
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sym2(0:62,j)=sym_rev(0:62)
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msg0(j)=msg
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enddo
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enddo
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nused=j
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first=.false.
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endif
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ref0=0.
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do j=1,63
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ref0=ref0 + s3(mrs(j)+1,j)
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enddo
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p1=-1.e30
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p2=-1.e30
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bb1=1.e30
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bb2=1.e30
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! Find p1 and p2 (best and second-best) codeword from a list, using
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! matched filters
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ip1=1 !Silence compiler warning
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ip2=1
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do k=1,nused
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pp(k)=0.
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if(k.ge.2 .and. k.le.64 .and. flip.lt.0.0) cycle
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! Test all messages if flip=+1; skip the CQ messages if flip=-1.
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if(flip.gt.0.0 .or. msg0(k)(1:3).ne.'CQ ') then
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psum=0.
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ref=ref0
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do j=1,63
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! i=ncode(j,k)+1
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i=sym2(j-1,k)+1
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psum=psum + s3(i,j)
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if(i.eq.mrs(j)+1) ref=ref - s3(i,j) + s3(mrs2(j)+1,j)
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enddo
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p=psum/ref
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pp(k)=p
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if(p.gt.p1) then
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p1=p
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ip1=k
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endif
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endif
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! Find best and second-best codeword using the FT-defined soft distance
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test=sym1(0:62,k)
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nh=0
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ns=0
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do i=0,62
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j=62-i
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if(mrsym(j).ne.test(i)) then
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nh=nh+1
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if(mr2sym(j).ne.test(i)) ns=ns+mrprob(j)
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endif
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enddo
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ds=ns*63.0/sum(mrprob)
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bb(k)=nh+ds
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if(nh+ds.lt.bb1) then
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nhard=nh
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dsoft=ds
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bb1=nh+ds
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ncandidates=0
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ntry=0
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ip2=k
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endif
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enddo
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do i=1,nused
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if(pp(i).gt.p2 .and. pp(i).ne.p1) p2=pp(i)
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if(bb(i).lt.bb2 .and. bb(i).ne.bb1) bb2=bb(i)
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enddo
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! ### DO NOT REMOVE ###
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! call cs_lock('deep65')
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! rewind 77
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! write(77,*) p1,p2
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! call flush(77)
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! call cs_unlock
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! ### Works OK without it (in both Windows and Linux) if compiled
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! ### without optimization. However, in Windows this is a colossal
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! ### pain because of the way F2PY wants to run the compile step.
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bias=max(1.12*p2,0.335)
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if(mode65.eq.2) bias=max(1.08*p2,0.405)
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if(mode65.ge.4) bias=max(1.04*p2,0.505)
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if(p2.eq.p1 .and. p1.ne.-1.e30) stop 'Error in deep65'
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qual=100.0*(p1-bias)
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decoded=' '
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if(bb1.le.110.0) decoded=msg0(ip2)
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nn=nn+1
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qual2=110.0-bb1 + 1.0
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return
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end subroutine exp_decode65
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