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Work on (174,101) encoding and decoding for ft4slow.
This commit is contained in:
Steven Franke
parent
3085047a96
commit
edeb756257
@ -1,12 +1,11 @@
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subroutine bpdecode174_101(llr,apmask,maxiterations,message50,cw,nharderror,iter)
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subroutine bpdecode174_101(llr,apmask,maxiterations,message101,cw,nharderror,iter,ncheck)
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!
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! A log-domain belief propagation decoder for the (174,101) code.
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!
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integer, parameter:: N=174, K=101, M=N-K
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integer*1 cw(N),apmask(N)
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integer*1 decoded(K)
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integer*1 message77(77)
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integer*1 message101(101)
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integer nrw(M),ncw
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integer Nm(8,M)
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integer Mn(3,N) ! 3 checks per bit
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@ -46,19 +45,18 @@ subroutine bpdecode174_101(llr,apmask,maxiterations,message50,cw,nharderror,iter
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! Check to see if we have a codeword (check before we do any iteration).
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cw=0
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where( zn .gt. 0. ) cw=1
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ncheck=0
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do i=1,M
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synd(i)=sum(cw(Nm(1:nrw(i),i)))
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if( mod(synd(i),2) .ne. 0 ) ncheck=ncheck+1
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! if( mod(synd(i),2) .ne. 0 ) write(*,*) 'check ',i,' unsatisfied'
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! if( mod(synd(i),2) .ne. 0 ) write(*,*) 'check ',i,' unsatisfied'
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enddo
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if( ncheck .eq. 0 ) then ! we have a codeword - if crc is good, return it
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decoded=cw(1:101)
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call get_crc24(decoded,101,nbadcrc)
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nharderror=count( (2*cw-1)*llr .lt. 0.0 )
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if(nbadcrc.eq.0) then
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message77=decoded(1:77)
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message101=decoded(1:101)
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return
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endif
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endif
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@ -1,4 +1,4 @@
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subroutine bpdecode174_74(llr,apmask,maxiterations,message50,cw,nharderror,iter)
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subroutine bpdecode174_74(llr,apmask,maxiterations,message50,cw,nharderror,iter,ncheck)
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!
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! A log-domain belief propagation decoder for the (174,74) code.
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!
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128
lib/fsk4hf/decode174_101.f90
Normal file
128
lib/fsk4hf/decode174_101.f90
Normal file
@ -0,0 +1,128 @@
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subroutine decode174_101(llr,Keff,ndeep,apmask,maxsuper,message101,cw,nharderror,iter,ncheck,dmin,isuper)
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!
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! A hybrid bp/osd decoder for the (174,101) code.
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!
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integer, parameter:: N=174, K=101, M=N-K
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integer*1 cw(N),apmask(N)
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integer*1 decoded(K)
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integer*1 message101(101)
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integer nrw(M),ncw
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integer Nm(8,M)
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integer Mn(3,N) ! 3 checks per bit
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integer synd(M)
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real tov(3,N)
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real toc(8,M)
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real tanhtoc(8,M)
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real zn(N),zsum(N)
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real llr(N)
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real Tmn
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include "ldpc_174_101_parity.f90"
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decoded=0
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toc=0
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tov=0
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tanhtoc=0
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! initialize messages to checks
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do j=1,M
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do i=1,nrw(j)
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toc(i,j)=llr((Nm(i,j)))
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enddo
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enddo
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ncnt=0
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nclast=0
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maxiterations=1
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zsum=0.0
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do isuper=1,maxsuper
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do iter=0,maxiterations
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! Update bit log likelihood ratios (tov=0 in iteration 0).
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do i=1,N
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if( apmask(i) .ne. 1 ) then
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zn(i)=llr(i)+sum(tov(1:ncw,i))
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else
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zn(i)=llr(i)
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endif
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enddo
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zsum=zsum+zn
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! Check to see if we have a codeword (check before we do any iteration).
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cw=0
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where( zn .gt. 0. ) cw=1
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ncheck=0
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do i=1,M
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synd(i)=sum(cw(Nm(1:nrw(i),i)))
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if( mod(synd(i),2) .ne. 0 ) ncheck=ncheck+1
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! if( mod(synd(i),2) .ne. 0 ) write(*,*) 'check ',i,' unsatisfied'
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enddo
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! write(*,*) 'number of unsatisfied parity checks ',ncheck
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if( ncheck .eq. 0 ) then ! we have a codeword - if crc is good, return it
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decoded=cw(1:K)
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call get_crc24(decoded,74,nbadcrc)
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nharderror=count( (2*cw-1)*llr .lt. 0.0 )
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if(nbadcrc.eq.0) then
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message101=decoded(1:101)
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dmin=0.0
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return
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endif
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endif
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! if( iter.gt.0 ) then ! this code block implements an early stopping criterion
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if( iter.gt.10000 ) then ! this code block implements an early stopping criterion
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nd=ncheck-nclast
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if( nd .lt. 0 ) then ! # of unsatisfied parity checks decreased
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ncnt=0 ! reset counter
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else
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ncnt=ncnt+1
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endif
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! write(*,*) iter,ncheck,nd,ncnt
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if( ncnt .ge. 5 .and. iter .ge. 10 .and. ncheck .gt. 15) then
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nharderror=-1
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return
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endif
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endif
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nclast=ncheck
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! Send messages from bits to check nodes
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do j=1,M
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do i=1,nrw(j)
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ibj=Nm(i,j)
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toc(i,j)=zn(ibj)
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do kk=1,ncw ! subtract off what the bit had received from the check
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if( Mn(kk,ibj) .eq. j ) then
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toc(i,j)=toc(i,j)-tov(kk,ibj)
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endif
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enddo
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enddo
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enddo
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! send messages from check nodes to variable nodes
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do i=1,M
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tanhtoc(1:8,i)=tanh(-toc(1:8,i)/2)
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enddo
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do j=1,N
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do i=1,ncw
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ichk=Mn(i,j) ! Mn(:,j) are the checks that include bit j
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Tmn=product(tanhtoc(1:nrw(ichk),ichk),mask=Nm(1:nrw(ichk),ichk).ne.j)
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call platanh(-Tmn,y)
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! y=atanh(-Tmn)
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tov(i,j)=2*y
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enddo
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enddo
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enddo ! bp iterations
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llr=zsum
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call osd174_101(llr,Keff,apmask,ndeep,message101,cw,nharderror,dmin)
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if(nharderror.gt.0) then
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return
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endif
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enddo ! super iterations
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nharderror=-1
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return
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end subroutine decode174_101
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@ -1,34 +1,34 @@
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data Mn/ &
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2, 54, 72, &
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18, 60, 62, &
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13, 24, 47, &
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37, 50, 70, &
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3, 30, 66, &
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4, 9, 14, &
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5, 19, 23, &
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6, 21, 47, &
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10, 33, 73, &
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7, 31, 50, &
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3, 30, 66, &
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8, 39, 70, &
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36, 46, 63, &
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16, 53, 55, &
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||||
10, 33, 73, &
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||||
11, 22, 49, &
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12, 60, 61, &
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16, 53, 55, &
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17, 63, 67, &
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24, 59, 64, &
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25, 27, 68, &
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14, 35, 44, &
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28, 57, 72, &
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||||
32, 48, 51, &
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||||
26, 38, 46, &
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||||
11, 22, 49, &
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28, 57, 72, &
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29, 36, 43, &
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32, 48, 51, &
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||||
34, 52, 69, &
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||||
45, 56, 65, &
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14, 35, 44, &
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40, 41, 42, &
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45, 56, 65, &
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||||
31, 51, 54, &
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||||
42, 58, 69, &
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||||
29, 36, 43, &
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||||
4, 10, 12, &
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||||
1, 37, 72, &
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2, 27, 64, &
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3, 41, 70, &
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1, 37, 72, &
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4, 10, 12, &
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5, 40, 59, &
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6, 19, 39, &
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7, 53, 68, &
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@ -104,150 +104,150 @@ data Mn/ &
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2, 5, 62, &
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3, 27, 57, &
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4, 43, 51, &
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2, 35, 63, &
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6, 53, 59, &
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14, 28, 40, &
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7, 29, 66, &
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||||
8, 42, 72, &
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||||
9, 31, 36, &
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||||
10, 35, 55, &
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||||
11, 13, 54, &
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||||
12, 63, 65, &
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||||
10, 11, 15, &
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||||
14, 22, 69, &
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||||
20, 41, 48, &
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||||
15, 16, 70, &
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||||
27, 38, 56, &
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||||
9, 16, 24, &
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||||
17, 47, 56, &
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||||
18, 45, 50, &
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||||
19, 30, 44, &
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||||
20, 60, 71, &
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||||
1, 44, 65, &
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||||
22, 26, 68, &
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||||
23, 28, 61, &
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||||
24, 25, 39, &
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||||
51, 69, 70, &
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||||
26, 34, 67, &
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||||
33, 39, 66, &
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||||
32, 37, 38, &
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||||
19, 36, 57, &
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||||
40, 49, 52, &
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||||
13, 46, 50, &
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||||
48, 64, 73, &
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||||
15, 17, 59, &
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||||
22, 26, 68, &
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||||
12, 37, 64, &
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||||
52, 55, 71, &
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||||
49, 53, 62, &
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||||
17, 18, 23, &
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||||
1, 44, 65, &
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||||
25, 32, 34, &
|
||||
1, 41, 43, &
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||||
33, 41, 46, &
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||||
2, 35, 63, &
|
||||
30, 45, 72, &
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||||
31, 61, 73, &
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||||
21, 29, 52, &
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||||
26, 34, 67, &
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||||
3, 6, 60, &
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||||
2, 61, 66, &
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||||
14, 28, 40, &
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||||
4, 7, 42, &
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||||
4, 6, 34, &
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||||
3, 13, 14, &
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||||
9, 38, 58, &
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||||
19, 36, 57, &
|
||||
25, 32, 34, &
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||||
32, 37, 38, &
|
||||
33, 41, 46, &
|
||||
17, 18, 23, &
|
||||
5, 43, 47, &
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||||
30, 45, 72, &
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||||
12, 37, 64, &
|
||||
27, 38, 56, &
|
||||
31, 61, 73, &
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||||
40, 49, 52, &
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||||
20, 41, 48, &
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||||
21, 29, 52, &
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||||
8, 68, 71, &
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||||
15, 17, 59, &
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||||
3, 13, 14, &
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||||
2, 61, 66, &
|
||||
9, 38, 58, &
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||||
48, 64, 73, &
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||||
49, 53, 62, &
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||||
10, 19, 26, &
|
||||
5, 37, 68, &
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||||
1, 41, 43, &
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||||
52, 55, 71, &
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||||
16, 20, 30, &
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||||
12, 39, 40, &
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||||
4, 6, 34, &
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||||
51, 69, 70, &
|
||||
7, 11, 64, &
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||||
18, 25, 35, &
|
||||
48, 57, 62, &
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||||
21, 45, 73, &
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||||
54, 58, 67, &
|
||||
9, 16, 24, &
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||||
27, 51, 55, &
|
||||
33, 53, 69, &
|
||||
20, 28, 67, &
|
||||
12, 39, 40, &
|
||||
33, 39, 66, &
|
||||
5, 37, 68, &
|
||||
8, 31, 59, &
|
||||
22, 29, 56, &
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||||
37, 50, 70, &
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||||
32, 44, 49, &
|
||||
10, 11, 15, &
|
||||
4, 9, 14, &
|
||||
21, 45, 73, &
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||||
27, 51, 55, &
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||||
23, 42, 65, &
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||||
1, 15, 71/
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||||
22, 29, 56, &
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||||
20, 28, 67, &
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||||
32, 44, 49, &
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||||
33, 53, 69, &
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||||
13, 24, 47, &
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36, 46, 63, &
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1, 15, 71, &
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48, 57, 62/
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data Nm/ &
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30, 52, 63, 101, 102, 138, 140, 174, &
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1, 28, 53, 76, 103, 142, 147, 0, &
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8, 29, 50, 77, 104, 146, 150, 0, &
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||||
27, 54, 76, 100, 105, 148, 149, 172, &
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||||
4, 31, 55, 78, 93, 103, 152, 155, &
|
||||
5, 32, 56, 79, 106, 146, 149, 0, &
|
||||
7, 33, 57, 80, 108, 148, 158, 0, &
|
||||
9, 34, 58, 81, 109, 153, 167, 0, &
|
||||
35, 55, 74, 110, 151, 163, 172, 0, &
|
||||
6, 27, 59, 82, 111, 154, 171, 0, &
|
||||
20, 36, 56, 58, 112, 158, 171, 0, &
|
||||
12, 27, 60, 83, 113, 134, 157, 0, &
|
||||
3, 37, 52, 84, 112, 130, 150, 0, &
|
||||
16, 61, 85, 107, 114, 150, 172, 0, &
|
||||
38, 47, 86, 116, 132, 171, 174, 0, &
|
||||
11, 39, 60, 76, 116, 156, 163, 0, &
|
||||
13, 40, 62, 87, 118, 132, 137, 0, &
|
||||
2, 36, 63, 88, 119, 137, 159, 0, &
|
||||
4, 32, 64, 85, 120, 128, 154, 0, &
|
||||
37, 53, 77, 115, 121, 156, 166, 0, &
|
||||
5, 41, 60, 85, 102, 145, 161, 0, &
|
||||
20, 42, 51, 89, 114, 133, 168, 0, &
|
||||
4, 39, 65, 89, 122, 137, 173, 0, &
|
||||
3, 14, 43, 65, 82, 123, 163, 0, &
|
||||
15, 44, 66, 90, 123, 139, 159, 0, &
|
||||
19, 41, 67, 91, 125, 133, 154, 0, &
|
||||
15, 28, 68, 86, 104, 117, 164, 0, &
|
||||
17, 38, 69, 80, 107, 122, 166, 0, &
|
||||
26, 37, 59, 81, 108, 145, 168, 0, &
|
||||
8, 44, 70, 81, 97, 120, 143, 156, &
|
||||
7, 24, 66, 77, 101, 110, 144, 167, &
|
||||
18, 45, 59, 92, 127, 139, 170, 0, &
|
||||
6, 46, 71, 93, 126, 141, 165, 0, &
|
||||
21, 47, 72, 94, 125, 139, 149, 0, &
|
||||
16, 34, 57, 95, 111, 142, 159, 0, &
|
||||
10, 26, 36, 72, 86, 110, 128, 0, &
|
||||
30, 70, 95, 100, 127, 134, 155, 169, &
|
||||
19, 48, 58, 96, 117, 127, 151, 0, &
|
||||
9, 32, 73, 87, 98, 123, 126, 157, &
|
||||
23, 31, 68, 97, 107, 129, 157, 0, &
|
||||
23, 29, 62, 94, 95, 115, 140, 141, &
|
||||
23, 25, 67, 84, 109, 148, 173, 0, &
|
||||
26, 44, 48, 87, 105, 140, 152, 0, &
|
||||
16, 49, 67, 79, 120, 138, 170, 0, &
|
||||
22, 47, 55, 98, 119, 143, 161, 0, &
|
||||
10, 19, 38, 54, 90, 130, 141, 0, &
|
||||
3, 5, 34, 45, 99, 118, 152, 0, &
|
||||
18, 35, 65, 79, 101, 115, 131, 160, &
|
||||
20, 50, 54, 82, 129, 136, 170, 0, &
|
||||
7, 49, 68, 75, 119, 130, 169, 0, &
|
||||
18, 24, 43, 88, 105, 124, 164, 0, &
|
||||
21, 40, 74, 80, 129, 135, 145, 0, &
|
||||
11, 33, 52, 94, 106, 136, 165, 0, &
|
||||
1, 24, 39, 71, 75, 112, 162, 0, &
|
||||
11, 51, 73, 78, 111, 135, 164, 0, &
|
||||
22, 46, 69, 100, 117, 118, 168, 0, &
|
||||
17, 40, 57, 83, 104, 128, 160, 0, &
|
||||
25, 50, 64, 91, 102, 151, 162, 0, &
|
||||
14, 31, 74, 91, 106, 132, 167, 0, &
|
||||
2, 12, 48, 75, 89, 121, 146, 0, &
|
||||
12, 45, 73, 88, 122, 144, 147, 0, &
|
||||
2, 41, 69, 98, 103, 136, 160, 0, &
|
||||
10, 13, 42, 70, 92, 113, 142, 0, &
|
||||
14, 28, 61, 64, 131, 134, 158, 0, &
|
||||
22, 43, 56, 93, 113, 138, 173, 0, &
|
||||
8, 35, 63, 83, 108, 126, 147, 0, &
|
||||
13, 49, 66, 78, 125, 162, 166, 0, &
|
||||
15, 33, 62, 96, 133, 153, 155, 0, &
|
||||
21, 25, 53, 97, 99, 114, 124, 165, &
|
||||
9, 29, 71, 90, 116, 124, 169, 0, &
|
||||
46, 61, 92, 121, 135, 153, 174, 0, &
|
||||
1, 17, 30, 51, 99, 109, 143, 0, &
|
||||
6, 42, 72, 84, 96, 131, 144, 161/
|
||||
27, 52, 63, 101, 102, 122, 152, 173, &
|
||||
1, 28, 53, 76, 103, 106, 147, 0, &
|
||||
4, 29, 50, 77, 104, 128, 146, 0, &
|
||||
5, 30, 54, 76, 100, 105, 130, 155, &
|
||||
6, 31, 55, 78, 93, 103, 136, 162, &
|
||||
7, 32, 56, 79, 107, 128, 155, 0, &
|
||||
8, 33, 57, 80, 108, 130, 157, 0, &
|
||||
9, 34, 58, 81, 109, 144, 163, 0, &
|
||||
5, 35, 55, 74, 110, 117, 148, 0, &
|
||||
10, 30, 59, 82, 111, 114, 151, 0, &
|
||||
11, 36, 56, 58, 112, 114, 157, 0, &
|
||||
12, 30, 60, 83, 113, 138, 160, 0, &
|
||||
37, 52, 84, 112, 126, 146, 171, 0, &
|
||||
5, 22, 61, 85, 115, 129, 146, 0, &
|
||||
38, 47, 86, 114, 116, 145, 173, 0, &
|
||||
13, 39, 60, 76, 116, 117, 154, 0, &
|
||||
14, 40, 62, 87, 118, 135, 145, 0, &
|
||||
2, 36, 63, 88, 119, 135, 158, 0, &
|
||||
6, 32, 64, 85, 120, 131, 151, 0, &
|
||||
37, 53, 77, 121, 142, 154, 168, 0, &
|
||||
7, 41, 60, 85, 102, 143, 164, 0, &
|
||||
11, 42, 51, 89, 115, 123, 167, 0, &
|
||||
6, 39, 65, 89, 124, 135, 166, 0, &
|
||||
15, 43, 65, 82, 117, 125, 171, 0, &
|
||||
16, 44, 66, 90, 125, 132, 158, 0, &
|
||||
17, 41, 67, 91, 123, 127, 151, 0, &
|
||||
16, 28, 68, 86, 104, 139, 165, 0, &
|
||||
18, 38, 69, 80, 124, 129, 168, 0, &
|
||||
19, 37, 59, 81, 108, 143, 167, 0, &
|
||||
4, 44, 70, 81, 97, 120, 137, 154, &
|
||||
8, 25, 66, 77, 101, 110, 140, 163, &
|
||||
20, 45, 59, 92, 132, 133, 169, 0, &
|
||||
10, 46, 71, 93, 134, 161, 170, 0, &
|
||||
21, 47, 72, 94, 127, 132, 155, 0, &
|
||||
22, 34, 57, 95, 106, 111, 158, 0, &
|
||||
19, 36, 72, 86, 110, 131, 172, 0, &
|
||||
3, 27, 70, 95, 100, 133, 138, 162, &
|
||||
17, 48, 58, 96, 133, 139, 148, 0, &
|
||||
9, 32, 73, 87, 98, 125, 160, 161, &
|
||||
23, 31, 68, 97, 129, 141, 160, 0, &
|
||||
23, 29, 62, 94, 95, 134, 142, 152, &
|
||||
23, 26, 67, 84, 109, 130, 166, 0, &
|
||||
19, 44, 48, 87, 105, 136, 152, 0, &
|
||||
22, 49, 67, 79, 120, 122, 169, 0, &
|
||||
24, 47, 55, 98, 119, 137, 164, 0, &
|
||||
17, 38, 54, 90, 126, 134, 172, 0, &
|
||||
7, 34, 45, 99, 118, 136, 171, 0, &
|
||||
20, 35, 65, 79, 101, 142, 149, 174, &
|
||||
11, 50, 54, 82, 141, 150, 169, 0, &
|
||||
3, 8, 49, 68, 75, 119, 126, 0, &
|
||||
20, 25, 43, 88, 105, 156, 165, 0, &
|
||||
21, 40, 74, 80, 141, 143, 153, 0, &
|
||||
13, 33, 52, 94, 107, 150, 170, 0, &
|
||||
1, 25, 39, 71, 75, 112, 159, 0, &
|
||||
13, 51, 73, 78, 111, 153, 165, 0, &
|
||||
24, 46, 69, 100, 118, 139, 167, 0, &
|
||||
18, 40, 57, 83, 104, 131, 174, 0, &
|
||||
26, 50, 64, 91, 102, 148, 159, 0, &
|
||||
15, 31, 74, 91, 107, 145, 163, 0, &
|
||||
2, 12, 48, 75, 89, 121, 128, 0, &
|
||||
12, 45, 73, 88, 124, 140, 147, 0, &
|
||||
2, 41, 69, 98, 103, 150, 174, 0, &
|
||||
14, 42, 70, 92, 106, 113, 172, 0, &
|
||||
15, 28, 61, 64, 138, 149, 157, 0, &
|
||||
24, 43, 56, 93, 113, 122, 166, 0, &
|
||||
4, 35, 63, 83, 108, 147, 161, 0, &
|
||||
14, 49, 66, 78, 127, 159, 168, 0, &
|
||||
16, 33, 62, 96, 123, 144, 162, 0, &
|
||||
21, 26, 53, 97, 99, 115, 156, 170, &
|
||||
3, 9, 29, 71, 90, 116, 156, 0, &
|
||||
46, 61, 92, 121, 144, 153, 173, 0, &
|
||||
1, 18, 27, 51, 99, 109, 137, 0, &
|
||||
10, 42, 72, 84, 96, 140, 149, 164/
|
||||
|
||||
data nrw/ &
|
||||
8,7,7,8,8,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, &
|
||||
|
||||
@ -12,7 +12,7 @@ program ldpcsim174_101
|
||||
integer*1 msgbits(101)
|
||||
integer*1 apmask(174)
|
||||
integer*1 cw(174)
|
||||
integer*1 codeword(N),message(77)
|
||||
integer*1 codeword(N),message(77),message101(101)
|
||||
integer ncrc24
|
||||
real rxdata(N),llr(N)
|
||||
real dllr(174),llrd(174)
|
||||
@ -59,7 +59,6 @@ program ldpcsim174_101
|
||||
|
||||
call get_crc24(msgbits,101,ncrc24)
|
||||
write(c24,'(b24.24)') ncrc24
|
||||
write(*,*) 'c24 ',c24
|
||||
read(c24,'(24i1)') msgbits(78:101)
|
||||
write(*,'(24i1)') msgbits(78:101)
|
||||
write(*,*) 'message with crc24'
|
||||
@ -103,10 +102,12 @@ write(*,'(24i1)') msgbits(78:101)
|
||||
llr=2.0*rxdata/(ss*ss)
|
||||
apmask=0
|
||||
! max_iterations is max number of belief propagation iterations
|
||||
call bpdecode174_101(llr,apmask,max_iterations,message,cw,nharderror,niterations)
|
||||
call bpdecode174_101(llr,apmask,max_iterations,message101,cw,nharderror,niterations,nchecks)
|
||||
dmin=0.0
|
||||
if( (nharderror .lt. 0) .and. (ndeep .ge. 0) ) then
|
||||
call osd174_101(llr, Keff, apmask, ndeep, message, cw, nharderror, dmin)
|
||||
! call osd174_101(llr, Keff, apmask, ndeep, message101, cw, nharderror, dmin)
|
||||
maxsuper=2
|
||||
call decode174_101(llr, Keff, ndeep, apmask, maxsuper, message101, cw, nharderror, iterations, ncheck, dmin, isuper)
|
||||
endif
|
||||
|
||||
if(nharderror.ge.0) then
|
||||
@ -127,7 +128,8 @@ write(*,'(24i1)') msgbits(78:101)
|
||||
write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,esn0,ngood,nue,ss,pberr
|
||||
|
||||
if(first) then
|
||||
write(c77,'(77i1)') message
|
||||
write(c77,'(77i1)') message101(1:77)
|
||||
write(*,'(101i1)') message101
|
||||
call unpack77(c77,0,msg,unpk77_success)
|
||||
if(unpk77_success) then
|
||||
write(*,1100) msg(1:37)
|
||||
|
||||
@ -13,7 +13,7 @@ program ldpcsim174_74
|
||||
integer*1 msgbits(74)
|
||||
integer*1 apmask(174)
|
||||
integer*1 cw(174)
|
||||
integer*1 codeword(N),message(50)
|
||||
integer*1 codeword(N),message74(74)
|
||||
integer ncrc24
|
||||
integer nerrtot(174),nerrdec(174),nmpcbad(74)
|
||||
real rxdata(N),llr(N)
|
||||
@ -107,11 +107,11 @@ program ldpcsim174_74
|
||||
llr=2.0*rxdata/(ss*ss)
|
||||
apmask=0
|
||||
! max_iterations is max number of belief propagation iterations
|
||||
call bpdecode174_74(llr,apmask,max_iterations,message,cw,nharderror,niterations)
|
||||
call bpdecode174_74(llr,apmask,max_iterations,message74,cw,nharderror,niterations,nchecks)
|
||||
dmin=0.0
|
||||
if( (nharderror .lt. 0) .and. (ndeep .ge. 0) ) then
|
||||
! call osd174_74(llr, Keff, apmask, ndeep, message, cw, nharderror, dmin)
|
||||
call decode174_74(llr,Keff,ndeep,apmask,max_iterations,message,cw,nharderror,niterations,ncheck,dmin,isuper)
|
||||
! call osd174_74(llr, Keff, apmask, ndeep, message74, cw, nharderror, dmin)
|
||||
call decode174_74(llr,Keff,ndeep,apmask,max_iterations,message74,cw,nharderror,niterations,ncheck,dmin,isuper)
|
||||
endif
|
||||
|
||||
if(nharderror.ge.0) then
|
||||
@ -132,7 +132,7 @@ call decode174_74(llr,Keff,ndeep,apmask,max_iterations,message,cw,nharderror,nit
|
||||
write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,esn0,ngood,nue,ss,pberr
|
||||
|
||||
if(first) then
|
||||
write(c77,'(50i1)') message
|
||||
write(c77,'(74i1)') message74
|
||||
c77(51:77)='000000000000000000000110000'
|
||||
call unpack77(c77,0,msg,unpk77_success)
|
||||
if(unpk77_success) then
|
||||
|
||||
@ -22,7 +22,7 @@ subroutine osd174_101(llr,k,apmask,ndeep,message101,cw,nhardmin,dmin)
|
||||
integer indices(N),nxor(N)
|
||||
integer*1 cw(N),ce(N),c0(N),hdec(N)
|
||||
integer*1, allocatable :: decoded(:)
|
||||
integer*1 message77(77),message101(101)
|
||||
integer*1 message101(101)
|
||||
integer indx(N)
|
||||
real llr(N),rx(N),absrx(N)
|
||||
|
||||
|
||||
@ -22,7 +22,8 @@ program wspr4d
|
||||
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||
integer*1 apmask(174),cw(174)
|
||||
integer*1 hbits(206)
|
||||
integer*1 message(50)
|
||||
integer*1 message74(74)
|
||||
integer*1 message101(101)
|
||||
logical badsync,unpk77_success
|
||||
|
||||
fs=12000.0/NDOWN !Sample rate
|
||||
@ -107,7 +108,7 @@ program wspr4d
|
||||
do if=-ifhw,ifhw
|
||||
fc=fc1+df*if
|
||||
do istart=max(1,is0-ishw),is0+ishw,dis
|
||||
call coherent_sync(c2,istart,fc,1,sync,data_aided,kstart,tones)
|
||||
call coherent_sync(c2,istart,fc,1,sync)
|
||||
if(sync.gt.smax) then
|
||||
fc2=fc
|
||||
isbest=istart
|
||||
@ -115,11 +116,12 @@ program wspr4d
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
write(*,*) ifile,icand,isync,fc1+del,fc2+del,isbest,smax
|
||||
! write(*,*) ifile,icand,isync,fc1+del,fc2+del,isbest,smax
|
||||
enddo
|
||||
|
||||
if(smax .lt. 100.0 ) cycle
|
||||
|
||||
! if(smax .lt. 100.0 ) cycle
|
||||
!isbest=375
|
||||
!fc2=-del
|
||||
idecoded=0
|
||||
do ijitter=0,2
|
||||
if(idecoded.eq.1) exit
|
||||
@ -166,18 +168,22 @@ program wspr4d
|
||||
nhardbp=0
|
||||
nhardosd=0
|
||||
dmin=0.0
|
||||
call bpdecode174_74(llr,apmask,max_iterations,message,cw,nhardbp,niterations)
|
||||
Keff=64
|
||||
! if(nhardbp.lt.0) call osd174_74(llr,Keff,apmask,5,message,cw,nhardosd,dmin)
|
||||
! call bpdecode174_74(llr,apmask,max_iterations,message74,cw,nhardbp,niterations,nchecks)
|
||||
call bpdecode174_101(llr,apmask,max_iterations,message101,cw,nhardbp,niterations,ncheck101)
|
||||
Keff=91
|
||||
! if(nhardbp.lt.0) call osd174_74(llr,Keff,apmask,5,message74,cw,nhardosd,dmin)
|
||||
! if(nhardbp.lt.0) call osd174_101(llr,Keff,apmask,5,message74,cw,nhardosd,dmin)
|
||||
maxsuperits=2
|
||||
ndeep=4
|
||||
! ndeep=4
|
||||
ndeep=3
|
||||
if(nhardbp.lt.0) then
|
||||
call decode174_74(llr,Keff,ndeep,apmask,maxsuperits,message,cw,nhardosd,iter,ncheck,dmin,isuper)
|
||||
! call decode174_74(llr,Keff,ndeep,apmask,maxsuperits,message74,cw,nhardosd,iter,ncheck,dmin,isuper)
|
||||
call decode174_101(llr,Keff,ndeep,apmask,maxsuperits,message101,cw,nhardosd,iter,ncheck,dmin,isuper)
|
||||
endif
|
||||
|
||||
if(nhardbp.ge.0 .or. nhardosd.ge.0) then
|
||||
write(c77,'(50i1)') message
|
||||
c77(51:77)='000000000000000000000110000'
|
||||
! write(c77,'(50i1)') message74(1:50)
|
||||
! c77(51:77)='000000000000000000000110000'
|
||||
write(c77,'(77i1)') message101(1:77)
|
||||
call unpack77(c77,0,msg,unpk77_success)
|
||||
if(unpk77_success .and. index(msg,'K9AN').gt.0) then
|
||||
idecoded=1
|
||||
|
||||
Loading…
Reference in New Issue
Block a user