56 lines
1.3 KiB
Plaintext
56 lines
1.3 KiB
Plaintext
subroutine softsym9f(ss2,ss3,i1SoftSymbols)
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! Compute soft symbols and S/N
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real ss2(0:8,85)
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real ss3(0:7,69)
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integer*1 i1SoftSymbolsScrambled(207)
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integer*1 i1SoftSymbols(207)
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ss=0.
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sig=0.
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if(ss2(0,1).eq.-999.0) return !Silence compiler warning
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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) !Baseline
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! call pctile(ss2,9*85,35,xmed) !### better? ###
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ss3=ss3/ave
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sig=sig/69. !Signal
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m0=3
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k=0
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scale=10.0
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do j=1,69
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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(scale*(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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call interleave9(i1SoftSymbolsScrambled,-1,i1SoftSymbols)
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return
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end subroutine softsym9f
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