mirror of https://github.com/saitohirga/WSJT-X.git
87 lines
1.9 KiB
Fortran
87 lines
1.9 KiB
Fortran
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subroutine symspec2(c5,nz3,nsps8,nspsd,fsample,snrdb,i1SoftSymbolsScrambled)
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complex c5(0:4096-1)
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complex z
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integer*1 i1SoftSymbolsScrambled(207)
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real aa(3)
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real ss2(0:8,85)
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real ss3(0:7,69)
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integer*1 i1
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equivalence (i1,i4)
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include 'jt9sync.f90'
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aa(1)=-1500.0/nsps8
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aa(2)=0.
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aa(3)=0.
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do i=0,8
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if(i.ge.1) call twkfreq(c5,c5,nz3,fsample,aa)
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m=0
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k=-1
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do j=1,85
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z=0.
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do n=1,nspsd
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k=k+1
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z=z+c5(k)
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enddo
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ss2(i,j)=real(z)**2 + aimag(z)**2
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if(i.ge.1 .and. isync(j).eq.0) then
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m=m+1
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ss3(i-1,m)=ss2(i,j)
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endif
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enddo
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enddo
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!###
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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,ss3(i,j))
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ss=ss+ss3(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)
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call pctile(ss2,9*85,35,xmed)
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ss3=ss3/ave
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sig=sig/69.
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df8=1500.0/nsps8
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t=max(1.0,sig/xmed - 1.0)
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snrdb=db(t) - db(2500.0/df8) - 4.5
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! print*,'A',ave,xmed,sig,t,df8,snrdb
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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(ss3(i,j).gt.smax) smax=ss3(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(ss3(4,j),ss3(5,j),ss3(6,j),ss3(7,j))
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r0=max(ss3(0,j),ss3(1,j),ss3(2,j),ss3(3,j))
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else if(m.eq.1) then
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r1=max(ss3(2,j),ss3(3,j),ss3(4,j),ss3(5,j))
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r0=max(ss3(0,j),ss3(1,j),ss3(6,j),ss3(7,j))
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else
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r1=max(ss3(1,j),ss3(2,j),ss3(4,j),ss3(7,j))
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r0=max(ss3(0,j),ss3(3,j),ss3(5,j),ss3(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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i4=i4+128
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i1SoftSymbolsScrambled(k)=i1
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enddo
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enddo
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return
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end subroutine symspec2
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