WSJT-X/lib/softsym9w.f90

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subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,i1softsymbols)
parameter (NFFT=6912,NH=NFFT/2,NQ=NH/2)
real s(NQ)
real s2(0:8,85)
real s3(0:7,69)
real x(NFFT)
complex cx(0:NH)
integer*2 id2(60*12000)
integer*1 i1SoftSymbolsScrambled(207)
integer*1 i1softsymbols(207)
include 'jt9sync.f90'
equivalence (x,cx)
df=12000.0/NFFT
! i0a=1
! i0b=5*12000
i0a=max(1.0,(xdt0-1.0)*12000.0)
i0b=(xdt0+1.0)*12000.0
k1=nint((f0-0.5*width)/df)
k2=nint((f0+0.5*width)/df)
smax=0.
i0pk=1
i1softsymbols=0
do i0=i0a,i0b,432
s=0.
ssum=0.
do j=1,16
ia=i0 + (ii(j)-1)*nfft
ib=ia+NFFT-1
x=1.e-6*id2(ia:ib)
call four2a(x,nfft,1,-1,0) !r2c FFT
do k=1,NQ
s(k)=s(k) + real(cx(k))**2 + aimag(cx(k))**2
enddo
enddo
ssum=ssum + sum(s(k1:k2))
if(ssum.gt.smax) then
smax=ssum
i0pk=i0
else
if(ssum.lt.0.7*smax) exit
endif
end do
xdt1=(i0pk-1)/12000.0
if(i0pk.le.0) go to 999
m=0
do j=1,85
ia=i0pk + (j-1)*nfft
ib=ia+NFFT-1
x=1.e-6*id2(ia:ib)
call four2a(x,nfft,1,-1,0) !r2c FFT
do k=1,NQ
s(k)=real(cx(k))**2 + aimag(cx(k))**2
enddo
dtone=df*(2**nsubmode)
do i=0,8
f=f0 + i*dtone
k1=nint((f-0.5*width)/df)
k2=nint((f+0.5*width)/df)
s2(i,j)=sum(s(k1:k2)) !Symbol spectra, including sync
enddo
if(isync(j).eq.0) then
m=m+1
s3(0:7,m)=s2(1:8,j) !Symbol spectra, data only
endif
! write(19,3101) j,s2(0:8,j)
!3101 format(i2,9f8.2)
enddo
ss=0.
sig=0.
do j=1,69
smax=0.
do i=0,7
smax=max(smax,s3(i,j))
ss=ss+s3(i,j)
enddo
sig=sig+smax
ss=ss-smax
enddo
ave=ss/(69*7) !Baseline
call pctile(s2,9*85,35,xmed)
s3=s3/ave
sig=sig/69. !Signal
t=max(1.0,sig - 1.0)
snrdb=db(t)
m0=3
k=0
do j=1,69
smax=0.
do i=0,7
if(s3(i,j).gt.smax) smax=s3(i,j)
enddo
do m=m0-1,0,-1 !Get bit-wise soft symbols
if(m.eq.2) then
r1=max(s3(4,j),s3(5,j),s3(6,j),s3(7,j))
r0=max(s3(0,j),s3(1,j),s3(2,j),s3(3,j))
else if(m.eq.1) then
r1=max(s3(2,j),s3(3,j),s3(4,j),s3(5,j))
r0=max(s3(0,j),s3(1,j),s3(6,j),s3(7,j))
else
r1=max(s3(1,j),s3(2,j),s3(4,j),s3(7,j))
r0=max(s3(0,j),s3(3,j),s3(5,j),s3(6,j))
endif
k=k+1
i4=nint(10.0*(r1-r0))
if(i4.lt.-127) i4=-127
if(i4.gt.127) i4=127
i1SoftSymbolsScrambled(k)=i4
enddo
enddo
! Remove interleaving
call interleave9(i1SoftSymbolsScrambled,-1,i1SoftSymbols)
999 return
end subroutine softsym9w