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130 lines
4.0 KiB
Fortran
130 lines
4.0 KiB
Fortran
subroutine q65_loops(c00,npts2,nsps,mode,mode_q65,nsubmode,nFadingModel, &
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ndepth,jpk0,xdt0,f0,width,iaptype,APmask,APsymbols,xdt1,f1,snr2,dat4,id2)
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use packjt77
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use timer_module, only: timer
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parameter (NN=63)
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parameter (LN=1152*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
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complex c00(0:npts2-1) !Analytic representation of dd(), 6000 Hz
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complex ,allocatable :: c0(:) !Ditto, with freq shift
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! character c77*77,decoded*37
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! logical unpk77_success
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real a(3) !twkfreq params f,f1,f2
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real s3(LN) !Symbol spectra
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real s3prob(64*NN) !Symbol-value probabilities
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integer APmask(13)
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integer APsymbols(13)
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integer cw4(63)
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integer dat4(13) !Decoded message (as 13 six-bit integers)
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integer nap(0:11) !AP return codes
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data nap/0,2,3,2,3,4,2,3,6,4,6,6/,nsave/0/
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data cw4/0, 0, 0, 0, 8, 4,60,35,17,48,33,25,34,43,43,43,35,15,46,30, &
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54,24,26,26,57,57,42, 3,23,11,49,49,16, 2, 6, 6,55,21,39,51, &
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51,51,42,42,50,25,31,35,57,30, 1,54,54,10,10,22,44,58,57,40, &
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21,21,19/
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id2=-1
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ircbest=9999
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allocate(c0(0:npts2-1))
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irc=-99
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s3lim=20.
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idfmax=3
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idtmax=3
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ibwmin=1
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ibwmax=3
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maxdist=5
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if(iand(ndepth,3).ge.2) then
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idfmax=5
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idtmax=5
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maxdist=15
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endif
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if(iand(ndepth,3).eq.3) then
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ibwmax=5
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endif
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LL=64*(mode_q65+2)
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napmin=99
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baud=6000.0/nsps
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xdt1=xdt0
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f1=f0
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do idf=1,idfmax
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ndf=idf/2
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if(mod(idf,2).eq.0) ndf=-ndf
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a=0.
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a(1)=-(f0+0.5*baud*ndf)
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call twkfreq(c00,c0,npts2,6000.0,a)
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do idt=1,idtmax
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ndt=idt/2
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if(iaptype.eq.0) then
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if(mod(idt,2).eq.0) ndt=-ndt
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jpk=jpk0 + nsps*ndt/16 !tsym/16
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if(jpk.lt.0) jpk=0
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call timer('spec64 ',0)
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call spec64(c0,nsps,mode,mode_q65,jpk,s3,LL,NN)
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call timer('spec64 ',1)
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call pctile(s3,LL*NN,40,base)
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s3=s3/base
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where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
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endif
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do ibw=ibwmin,ibwmax
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nbw=ibw/2
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if(mod(ibw,2).eq.0) nbw=-nbw
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ndist=ndf**2 + ndt**2 + nbw**2
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if(ndist.gt.maxdist) cycle
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xx=1.885*log(3.0*width)+nbw
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b90=1.7**xx
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if(b90.gt.345.0) cycle
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call timer('q65_intr',0)
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b90ts = b90/baud
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call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
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call timer('q65_intr',1)
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call timer('q65_dec ',0)
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call q65_dec(s3,s3prob,APmask,APsymbols,esnodb,dat4,irc)
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call timer('q65_dec ',1)
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if(irc.ge.0) id2=iaptype+2
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!### Temporary ###
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! if(irc.ge.0) then
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! write(c77,1000) dat4(1:12),dat4(13)/2
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!1000 format(12b6.6,b5.5)
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! call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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! snr2=esnodb - db(2500.0/baud)
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! xdt1=xdt0 + nsps*ndt/(16.0*6000.0)
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! f1=f0 + 0.5*baud*ndf
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! open(56,file='fort.56',status='unknown',position='append')
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! write(56,3055) idf,idt,ibw,id2,irc,xdt1,f1,snr2,trim(decoded)
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!3055 format(5i3,3f8.2,2x,a)
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! close(56)
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! endif
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!###
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if(irc.ge.0) go to 100
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! irc > 0 ==> number of iterations required to decode
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! -1 = invalid params
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! -2 = decode failed
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! -3 = CRC mismatch
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enddo ! ibw (b90 loop)
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enddo ! idt (DT loop)
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enddo ! idf (f0 loop)
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if(iaptype.eq.0) then
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a=0.
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a(1)=-f0
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call twkfreq(c00,c0,npts2,6000.0,a)
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jpk=3000 !### Are these definitions OK?
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if(nsps.ge.3600) jpk=6000 !### TR >= 60 s
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call spec64(c0,nsps,mode,mode_q65,jpk,s3,LL,NN)
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call pctile(s3,LL*NN,40,base)
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s3=s3/base
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where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
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endif
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100 if(irc.ge.0) then
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snr2=esnodb - db(2500.0/baud)
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xdt1=xdt0 + nsps*ndt/(16.0*6000.0)
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f1=f0 + 0.5*baud*ndf
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endif
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return
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end subroutine q65_loops
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