122 lines
2.6 KiB
Plaintext
122 lines
2.6 KiB
Plaintext
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subroutine sfrsd(mrsym,mrprob,mr2sym,mr2prob,ntrials,correct,indexes, &
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param,ntry)
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integer mrsym(0:62),mrprob(0:62),mr2sym(0:62),mr2prob(0:62)
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integer correct(0:62),indexes(0:62),probs(0:62),thresh0(0:62)
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integer rxdat(0:62),rxdat2(0:62),rxprob(0:62),rxprob2(0:62)
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integer workdat(0:62),era_pos(0:50)
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integer perr(0:7,0:7)
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integer param(0:7)
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real ratio0(0:62)
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call init_rs_int()
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do i=0,62
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rxdat(i)=mrsym(62-i)
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rxdat2(i)=mr2sym(62-i)
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rxprob(i)=mrprob(62-i)
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rxprob2(i)=mr2prob(62-i)
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enddo
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do i=0,62
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indexes(i)=i
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probs(i)=rxprob(i)
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enddo
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do ip=1,62
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do k=0,63-ip
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if(probs(k).lt.probs(k+1)) then
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ntmp=probs(k)
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probs(k)=probs(k+1)
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probs(k+1)=ntmp
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ntmp=indexes(k)
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indexes(k)=indexes(k+1)
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indexes(k+1)=ntmp
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endif
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enddo
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enddo
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era_pos=0
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numera=0
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workdat=rxdat
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call decode_rs_int()
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if(nerr.ge.0) then
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correct=workdat
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param=0
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return
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endif
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call random_seed()
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ncandidates=0
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nsum=0
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do i=0,62
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nsum=nsum+rxprob(i)
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j=indexes(62-i)
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ratio0(i)=float(rxprob2(j))/(float(rxprob(j))+0.01)
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ii=int(7.999*ratio0(i))
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jj=(62-i)/8
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thresh0(i)=nint(1.3*perr(jj,ii))
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enddo
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if(nsum.eq.0) return
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do k=0,ntrials
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era_pos=0
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workdat=rxdat
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numera=0
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do i=0,62
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j=indexes(62-i)
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thresh=thresh0(i)
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ir=rand()
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if(...) then
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era_pos(numera)=j
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numera=numera+1
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endif
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enddo
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call decode_rs_int()
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if(nerr.ge.0) then
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ncandidates=ncandidates+1
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nhard=0
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nsoft=0
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nsofter=0
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do i=0,62
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if(workdat(i).ne.rxdat(i)) then
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nhard=nhard+1
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nsofter=nsofter+rxprob(i)
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if(workdat(i).ne.rxdat2(i)) nsoft=nsoft+rxprob(i)
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else
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nsofter=nsofter-rxprob(i)
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endif
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enddo
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nsoft=63*nsoft/nsum
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nsofter=63*nsofter/nsum
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ntotal=nsoft+nhard
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if(ntotal.lt.ntotal_min) then
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nsoft_min=nsoft
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nhard_min=nhard
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nsofter_min=nsofter
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ntotal_min=ntotal
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correct=workdat
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nera_best=numera
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ntry=k
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endif
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if(ntotal_min.lt.72 .and. nhard_min.lt.42) exit
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endif
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if(k.eq.ntrials-1) ntry=k+1
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enddo
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if(ntotal_min.ge.76 .or. nhard.ge.44) nhard_min=-1
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param(0)=ncandidates
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param(1)=nhard_min
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param(2)=nsoft_min
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param(3)=nera_best
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param(4)=nsofter_min
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if(param(0).eq.0) param(2)=-1
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return
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end subroutine sfrsd
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