WSJT-X/lib/hint65.f90

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3.4 KiB
Fortran
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subroutine hint65(s3,mrs,mrs2,mrsym,mr2sym,mrprob,nadd,flip, &
mycall,hiscall0,hisgrid0,nexp_decode,qual,decoded)
use packjt
use prog_args
parameter (NMAX=10000)
real s3(64,63)
integer*1 sym1(0:62,NMAX)
integer*1 sym2(0:62,NMAX)
integer mrs(63),mrs2(63)
integer mrsym(0:62),mr2sym(0:62),mrprob(0:62)
integer dgen(12),sym(0:62),sym_rev(0:62)
! integer test(0:62)
character*6 mycall,hiscall0,hisgrid0,hiscall(NMAX)
character*4 hisgrid(NMAX)
character callsign*12,grid*4
character*180 line
character ceme*3,msg*22
character*22 msg0(2*NMAX+100),decoded
logical*1 eme(NMAX)
logical first
data first/.true./
save first,sym1,nused,msg0,sym2
if(first) then
neme=0
open(23,file=trim(data_dir)//'/CALL3.TXT',status='unknown')
icall=0
j=0
do i=1,NMAX
read(23,1002,end=10) line
1002 format(a80)
if(line(1:4).eq.'ZZZZ') cycle
if(line(1:2).eq.'//') cycle
i1=index(line,',')
if(i1.lt.4) cycle
i2=index(line(i1+1:),',')
if(i2.lt.5) cycle
i2=i2+i1
i3=index(line(i2+1:),',')
if(i3.lt.1) i3=index(line(i2+1:),' ')
i3=i2+i3
callsign=line(1:i1-1)
grid=line(i1+1:i2-1)
ceme=line(i2+1:i3-1)
eme(i)=ceme.eq.'EME'
if(neme.eq.1 .and. (.not.eme(i))) cycle
j=j+1
hiscall(j)=callsign(1:6) !### Fix for compound callsigns!
hisgrid(j)=grid
enddo
10 ncalls=j
close(23)
! NB: generation of test messages is not yet complete!
j=0
do i=1,ncalls
j=j+1
msg=mycall//' '//hiscall(i)//' '//hisgrid(i)
! if(isnr.ne.-20) write(msg(14:18),"(i3,' ')") isnr
call fmtmsg(msg,iz)
call packmsg(msg,dgen,itype) !Pack message into 72 bits
call rs_encode(dgen,sym_rev) !RS encode
sym(0:62)=sym_rev(62:0:-1)
sym1(0:62,j)=sym
call interleave63(sym_rev,1) !Interleave channel symbols
call graycode(sym_rev,63,1,sym_rev) !Apply Gray code
sym2(0:62,j)=sym_rev(0:62)
msg0(j)=msg
enddo
nused=j
first=.false.
endif
ref0=0.
do j=1,63
ref0=ref0 + s3(mrs(j)+1,j)
enddo
u1=0.
u1=-99.0
u2=u1
dtotal=199.0
! Find u1 and u2 (best and second-best) codeword from a list, using
! a bank of matched filters on the symbol spectra s3(i,j).
ipk=1
do k=1,nused
if(k.ge.2 .and. k.le.64 .and. flip.lt.0.0) cycle
! Test all messages if flip=+1; skip the CQ messages if flip=-1.
if(flip.gt.0.0 .or. msg0(k)(1:3).ne.'CQ ') then
psum=0.
ref=ref0
do j=1,63
i=sym2(j-1,k)+1
psum=psum + s3(i,j)
if(i.eq.mrs(j)+1) ref=ref - s3(i,j) + s3(mrs2(j)+1,j)
enddo
p=psum/ref
! Find the FT-defined soft distance
! test=sym1(0:62,k)
! nh=0
! ns=0
! do i=0,62
! j=62-i
! if(mrsym(j).ne.test(i)) then
! nh=nh+1
! if(mr2sym(j).ne.test(i)) ns=ns+mrprob(j)
! endif
! enddo
! ds=ns*63.0/sum(mrprob)
if(p.gt.u1) then
u2=u1
u1=p
ipk=k
! nhard=nh
! dsoft=ds
! dtotal=nh+ds
! ncandidates=0
! ntry=0
endif
endif
enddo
decoded=' '
qual=100.0*(u1-1.12*u2)
qmin=1.0
if(qual.ge.qmin) decoded=msg0(ipk)
return
end subroutine hint65