97 lines
2.1 KiB
Plaintext
97 lines
2.1 KiB
Plaintext
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subroutine setup65
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! Defines arrays related to the JT65 pseudo-random synchronizing pattern.
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! Executed at program start.
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use jt65_mod
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integer nprc(126)
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! JT65
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data nprc/ &
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1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0, &
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0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1, &
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0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1, &
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0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1, &
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1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1, &
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0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1, &
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1,1,1,1,1,1/
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data mr2/0/ !Silence compiler warning
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! Put the appropriate pseudo-random sequence into pr
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nsym=126
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do i=1,nsym
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pr(i)=2*nprc(i)-1
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enddo
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! Determine locations of data and reference symbols
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k=0
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mr1=0
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do i=1,nsym
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if(pr(i).lt.0.0) then
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k=k+1
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mdat(k)=i
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else
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mr2=i
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if(mr1.eq.0) mr1=i
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endif
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enddo
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nsig=k
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! Determine the reference symbols for each data symbol.
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do k=1,nsig
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m=mdat(k)
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mref(k,1)=mr1
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do n=1,10 !Get ref symbol before data
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if((m-n).gt.0) then
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if (pr(m-n).gt.0.0) go to 10
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endif
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enddo
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go to 12
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10 mref(k,1)=m-n
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12 mref(k,2)=mr2
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do n=1,10 !Get ref symbol after data
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if((m+n).le.nsym) then
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if (pr(m+n).gt.0.0) go to 20
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endif
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enddo
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cycle
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20 mref(k,2)=m+n
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enddo
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! Now do it all again, using opposite logic on pr(i)
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k=0
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mr1=0
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do i=1,nsym
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if(pr(i).gt.0.0) then
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k=k+1
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mdat2(k)=i
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else
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mr2=i
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if(mr1.eq.0) mr1=i
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endif
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enddo
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nsig=k
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do k=1,nsig
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m=mdat2(k)
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mref2(k,1)=mr1
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do n=1,10
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if((m-n).gt.0) then
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if (pr(m-n).lt.0.0) go to 110
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endif
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enddo
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go to 112
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110 mref2(k,1)=m-n
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112 mref2(k,2)=mr2
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do n=1,10
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if((m+n).le.nsym) then
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if (pr(m+n).lt.0.0) go to 120
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endif
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enddo
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cycle
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120 mref2(k,2)=m+n
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enddo
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return
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end subroutine setup65
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