WSJT-X/lib/qra/q65/q65_loops.f90

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Fortran
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subroutine q65_loops(c00,npts2,nsps,mode,mode64,nsubmode,nFadingModel, &
ndepth,jpk0,xdt,f0,width,ipass,APmask,APsymbols,snr1,snr2,irc,dat4)
use packjt77
use timer_module, only: timer
parameter (LN=2176*63) !LN=LL*NN; LL = 64*(mode64+2)
character*37 decoded
character*77 c77
complex c00(0:npts2-1) !Analytic representation of dd(), 6000 Hz
complex ,allocatable :: c0(:) !Ditto, with freq shift
real a(3) !twkfreq params f,f1,f2
real s3(LN) !Symbol spectra
real s3avg(LN) !Averaged symbol spectra
real s3prob(LN) !Symbol-value probabilities
logical unpk77_success
integer APmask(13)
integer APsymbols(13)
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integer dat4(13) !Decoded message (as 13 six-bit integers)
integer nap(0:11) !AP return codes
data nap/0,2,3,2,3,4,2,3,6,4,6,6/,nsave/0/
save nsave,s3avg
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ircbest=9999
allocate(c0(0:npts2-1))
irc=-99
s3lim=20.
ibwmax=11
if(mode64.le.4) ibwmax=9
ibwmin=ibwmax
idtmax=3
call qra_params(ndepth,maxaptype,idfmax,idtmax,ibwmin,ibwmax,maxdist)
LL=64*(mode64+2)
NN=63
napmin=99
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baud=6000.0/nsps
do iavg=0,1
if(iavg.eq.1) then
idfmax=1
idtmax=1
endif
do idf=1,idfmax
ndf=idf/2
if(mod(idf,2).eq.0) ndf=-ndf
a=0.
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a(1)=-(f0+0.5*baud*ndf)
call twkfreq(c00,c0,npts2,6000.0,a)
do idt=1,idtmax
ndt=idt/2
if(iavg.eq.0) then
if(mod(idt,2).eq.0) ndt=-ndt
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jpk=jpk0 + nsps*ndt/16 !tsym/16
if(jpk.lt.0) jpk=0
call timer('spec64 ',0)
call spec64(c0,nsps,mode,mode64,jpk,s3,LL,NN)
call timer('spec64 ',1)
call pctile(s3,LL*NN,40,base)
s3=s3/base
where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
else
s3(1:LL*NN)=s3avg(1:LL*NN)
endif
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do ibw=ibwmin,ibwmax
nbw=ibw
ndist=ndf**2 + ndt**2 + ((nbw-2))**2
if(ndist.gt.maxdist) cycle
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! b90=1.728**ibw
b90=3.0**nbw
if(b90.gt.230.0) cycle
! if(b90.lt.0.15*width) exit
call timer('q65_intr',0)
call q65_intrinsics_ff(s3,nsubmode,b90,nFadingModel,s3prob)
call timer('q65_intr',1)
call timer('q65_dec ',0)
call q65_dec(s3,s3prob,APmask,APsymbols,esnodb,dat4,irc)
call timer('q65_dec ',1)
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if(irc.ge.0) go to 100
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! irc > 0 ==> number of iterations required to decode
! -1 = invalid params
! -2 = decode failed
! -3 = CRC mismatch
enddo ! ibw (b90 loop)
enddo ! idt (DT loop)
enddo ! idf (f0 loop)
if(iavg.eq.0) then
a=0.
a(1)=-f0
call twkfreq(c00,c0,npts2,6000.0,a)
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jpk=3000 !### Are these definitions OK?
if(nsps.ge.3600) jpk=6000 !### TR >= 60 s
call spec64(c0,nsps,mode,mode64,jpk,s3,LL,NN)
call pctile(s3,LL*NN,40,base)
s3=s3/base
where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
s3avg(1:LL*NN)=s3avg(1:LL*NN)+s3(1:LL*NN)
nsave=nsave+1
endif
if(iavg.eq.0 .and. nsave.lt.2) exit
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enddo ! iavg
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100 if(irc.ge.0) then
navg=nsave
snr2=esnodb - db(2500.0/baud)
if(iavg.eq.0) navg=0
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!### For tests only:
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open(53,file='fort.53',status='unknown',position='append')
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write(c77,1100) dat4
1100 format(12b6.6,b5.5)
call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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write(53,3053) ndf,ndt,nbw,b90,xdt,f0,snr2,ndist,irc,ipass,navg, &
snr1,trim(decoded)
3053 format(3i4,f6.1,f6.2,f7.1,f6.1,4i4,f7.2,1x,a)
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close(53)
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!###
nsave=0
s3avg=0.
irc=irc + 100*navg
endif
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return
end subroutine q65_loops