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36 lines
1.1 KiB
Fortran
36 lines
1.1 KiB
Fortran
subroutine sfox_hard(crcvd,f,t,chansym)
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use sfox_mod
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! include "sfox_params.f90"
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complex crcvd(NMAX) !Signal as received
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complex c(0:NSPS-1) !Work array, one symbol long
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real s(0:NQ-1) !Power spectrum
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integer chansym(NN) !Recovered hard-decision symbols
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integer ipk(1)
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i0=nint(12000.0*t)
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df=12000.0/NSPS
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j0=nint(f/df)-NQ/2
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do n=1,ND !Loop over all symbols
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ib=n*NSPS + i0
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if(n.gt.ND1) ib=(NS+n)*NSPS + i0
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ia=ib-NSPS+1
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if(ia.lt.1 .or. ib.gt.NMAX) cycle
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c=crcvd(ia:ib)
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call four2a(c,NSPS,1,-1,1) !Compute symbol spectrum
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do j=0,NQ-1
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s(j)=real(c(j0+j))**2 + aimag(c(j0+j))**2
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enddo
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! Could we measure fspread, perhaps in the sync routine, and use that to
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! decide whether to smooth spectra here?
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! call smo121(s,NSPS) !Helps for LD, HM propagation...
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! call smo121(s,NSPS)
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ipk=maxloc(s(0:NQ-1))
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chansym(n)=ipk(1) - 1
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enddo
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return
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end subroutine sfox_hard
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