mirror of https://github.com/saitohirga/WSJT-X.git
126 lines
2.9 KiB
Fortran
126 lines
2.9 KiB
Fortran
subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,snrdb,i1softsymbols)
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parameter (NFFT=6912,NH=NFFT/2,NQ=NH/2)
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real s(NQ)
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real s2(0:8,85)
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real s3(0:7,69)
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real x(NFFT)
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complex cx(0:NH)
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integer*2 id2(60*12000)
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integer*1 i1SoftSymbolsScrambled(207)
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integer*1 i1softsymbols(207)
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include 'jt9sync.f90'
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equivalence (x,cx)
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if(npts.eq.-99) stop !Silence compiler warning
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df=12000.0/NFFT
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i0a=max(1.0,(xdt0-1.0)*12000.0)
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i0b=(xdt0+1.0)*12000.0
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k1=max(1,nint((f0-0.5*width)/df))
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k2=min(NQ,nint((f0+0.5*width)/df))
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smax=0.
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i0pk=1
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i1softsymbols=0
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do i0=i0a,i0b,432
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s=0.
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ssum=0.
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do j=1,16
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ia=i0 + (ii(j)-1)*nfft
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ib=ia+NFFT-1
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x=1.e-6*id2(ia:ib)
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call four2a(x,nfft,1,-1,0) !r2c FFT
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do k=1,NQ
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s(k)=s(k) + real(cx(k))**2 + aimag(cx(k))**2
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enddo
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enddo
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ssum=ssum + sum(s(k1:k2))
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if(ssum.gt.smax) then
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smax=ssum
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i0pk=i0
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else
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if(ssum.lt.0.7*smax) exit
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endif
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end do
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xdt1=(i0pk-1)/12000.0
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if(i0pk.le.0) go to 999
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m=0
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do j=1,85
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ia=i0pk + (j-1)*nfft
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ib=ia+NFFT-1
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x=1.e-6*id2(ia:ib)
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call four2a(x,nfft,1,-1,0) !r2c FFT
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do k=1,NQ
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s(k)=real(cx(k))**2 + aimag(cx(k))**2
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enddo
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dtone=df*(2**nsubmode)
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do i=0,8
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f=f0 + i*dtone
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k1=max(1,nint((f-0.5*width)/df))
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k2=min(NQ,nint((f+0.5*width)/df))
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s2(i,j)=sum(s(k1:k2)) !Symbol spectra, including sync
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enddo
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if(isync(j).eq.0) then
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m=m+1
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s3(0:7,m)=s2(1:8,j) !Symbol spectra, data only
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endif
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! write(19,3101) j,s2(0:8,j)
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!3101 format(i2,9f8.2)
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enddo
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ss=0.
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sig=0.
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do j=1,69
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smax=0.
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do i=0,7
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smax=max(smax,s3(i,j))
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ss=ss+s3(i,j)
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enddo
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sig=sig+smax
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ss=ss-smax
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enddo
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ave=ss/(69*7) !Baseline
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call pctile(s2,9*85,35,xmed)
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s3=s3/ave
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sig=sig/69. !Signal
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snrdb=db(sig/xmed) - 28.0
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m0=3
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k=0
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do j=1,69
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smax=0.
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do i=0,7
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if(s3(i,j).gt.smax) smax=s3(i,j)
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enddo
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do m=m0-1,0,-1 !Get bit-wise soft symbols
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if(m.eq.2) then
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r1=max(s3(4,j),s3(5,j),s3(6,j),s3(7,j))
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r0=max(s3(0,j),s3(1,j),s3(2,j),s3(3,j))
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else if(m.eq.1) then
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r1=max(s3(2,j),s3(3,j),s3(4,j),s3(5,j))
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r0=max(s3(0,j),s3(1,j),s3(6,j),s3(7,j))
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else
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r1=max(s3(1,j),s3(2,j),s3(4,j),s3(7,j))
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r0=max(s3(0,j),s3(3,j),s3(5,j),s3(6,j))
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endif
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k=k+1
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i4=nint(10.0*(r1-r0))
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if(i4.lt.-127) i4=-127
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if(i4.gt.127) i4=127
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i1SoftSymbolsScrambled(k)=i4
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enddo
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enddo
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! Remove interleaving
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call interleave9(i1SoftSymbolsScrambled,-1,i1SoftSymbols)
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999 return
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end subroutine softsym9w
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