2024-01-31 14:02:33 -05:00
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subroutine hard_symbols(crcvd,f,t,jdat)
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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:NSPS-1) !Power spectrum
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2024-02-02 15:44:03 -05:00
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integer jdat(NN) !Recovered hard-decision symbols
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2024-01-31 14:02:33 -05:00
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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)-128
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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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2024-01-31 18:59:41 -05:00
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if(ia.lt.1 .or. ib.gt.NMAX) cycle
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2024-01-31 14:02:33 -05:00
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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 i=0,NSPS-1
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s(i)=real(c(i))**2 + aimag(c(i))**2
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enddo
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ipk=maxloc(s)
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ipk(1)=ipk(1)-j0
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if(ipk(1).ge.64) then
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jdat(n)=ipk(1)-64
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else
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jdat(n)=ipk(1)+256-64
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endif
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enddo
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2024-02-07 14:24:05 -05:00
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! jdat(NN-1:nn)=0
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2024-01-31 14:02:33 -05:00
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return
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end subroutine hard_symbols
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