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

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subroutine q65_loops(c00,npts2,nsps,mode_q65,nsubmode,ndepth,jpk0, &
xdt0,f0,iaptype,xdt1,f1,snr2,dat4,idec)
use packjt77
use timer_module, only: timer
parameter (NN=63)
parameter (LN=1152*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
complex c00(0:npts2-1) !Analytic representation of dd(), 6000 Hz
complex ,allocatable :: c0(:) !Ditto, with freq shift
character decoded*37
real a(3) !twkfreq params f,f1,f2
real s3(LN) !Symbol spectra
integer cw4(63)
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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/
data cw4/0, 0, 0, 0, 8, 4,60,35,17,48,33,25,34,43,43,43,35,15,46,30, &
54,24,26,26,57,57,42, 3,23,11,49,49,16, 2, 6, 6,55,21,39,51, &
51,51,42,42,50,25,31,35,57,30, 1,54,54,10,10,22,44,58,57,40, &
21,21,19/
idec=-1
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ircbest=9999
allocate(c0(0:npts2-1))
irc=-99
s3lim=20.
baud=6000.0/nsps
idfmax=3
idtmax=3
ibwa=max(1,int(1.8*log(baud*mode_q65)) + 2)
ibwb=min(10,ibwa+4)
ibw0=(ibwa+ibwb)/2
maxdist=5
if(iand(ndepth,3).ge.2) then
idfmax=5
idtmax=5
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maxdist=10
endif
if(iand(ndepth,3).eq.3) then
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maxdist=15
ibwa=max(1,ibwa-1)
ibwb=min(10,ibwb+1)
endif
LL=64*(mode_q65+2)
napmin=99
xdt1=xdt0
f1=f0
do idf=1,idfmax
ndf=idf/2
if(mod(idf,2).eq.0) ndf=-ndf
a=0.
a(1)=-(f0+0.5*baud*ndf)
call twkfreq(c00,c0,npts2,6000.0,a)
do idt=1,idtmax
ndt=idt/2
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if(mod(idt,2).eq.0) ndt=-ndt
jpk=jpk0 + nsps*ndt/16 !tsym/16
if(jpk.lt.0) jpk=0
call timer('spec64 ',0)
call spec64(c0,nsps,65,mode_q65,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
do ibw=ibwa,ibwb
ndist=ndf**2 + ndt**2 + (ibw-ibw0)**2
if(ndist.gt.maxdist) cycle
b90=1.72**ibw
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if(b90.gt.345.0) cycle
b90ts = b90/baud
call timer('dec2 ',0)
call q65_dec2(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
call timer('dec2 ',1)
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! irc > 0 ==> number of iterations required to decode
! -1 = invalid params
! -2 = decode failed
! -3 = CRC mismatch
if(irc.ge.0) go to 100
enddo ! ibw (b90 loop)
enddo ! idt (DT loop)
enddo ! idf (f0 loop)
100 if(irc.ge.0) then
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! write(55,3055) ndepth,iaptype,idf,idt,ibw,ndist,irc,sum(s3(1:LL*NN)), &
! trim(decoded)
!3055 format(7i4,f10.1,1x,a)
idec=iaptype+2
snr2=esnodb - db(2500.0/baud)
xdt1=xdt0 + nsps*ndt/(16.0*6000.0)
f1=f0 + 0.5*baud*ndf
endif
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return
end subroutine q65_loops