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Fix problems with ldpc174_91.f90
This commit is contained in:
Steven Franke
parent
6363f3fd43
commit
82e66f3251
@ -1,55 +1,56 @@
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program ldpcsim174_91
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! End to end test of the (174,91)/crc14 encoder and decoder.
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use packjt77
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use packjt77
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integer, parameter:: N=174, K=91, M=N-K
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character*37 msg,msgsent,msgreceived
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character*77 c77
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character*8 arg
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character*6 grid
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character*96 tmpchar
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integer*1, allocatable :: codeword(:), decoded(:), message(:)
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integer*1 msgbits(77)
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integer*1 message77(77),message91(91)
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integer*1 apmask(N), cw(N)
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integer nerrtot(0:N),nerrdec(0:N)
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logical unpk77_success
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real*8, allocatable :: rxdata(:)
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real, allocatable :: llr(:)
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integer, parameter:: N=174, K=91, M=N-K
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character*37 msg,msgsent,msgreceived
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character*77 c77
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character*8 arg
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character*6 grid
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character*96 tmpchar
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integer*1, allocatable :: codeword(:), decoded(:), message(:)
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integer*1 msgbits(77)
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integer*1 message77(77),message91(91)
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integer*1 apmask(N), cw(N)
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integer nerrtot(0:N),nerrdec(0:N)
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logical unpk77_success
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real*8, allocatable :: rxdata(:)
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real, allocatable :: llr(:)
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nerrtot=0
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nerrdec=0
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nerrtot=0
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nerrdec=0
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nargs=iargc()
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if(nargs.ne.6) then
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print*,'Usage: ldpcsim niter ndepth #trials s Keff BPOSD'
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nargs=iargc()
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if(nargs.ne.6) then
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print*,'Usage: ldpcsim niter ndepth #trials s Keff nbposd'
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print*,'eg: ldpcsim 10 2 1000 0.84 91 1'
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print*,'belief propagation iterations: niter, ordered-statistics depth: ndepth'
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print*,'If s is negative, then value is ignored and sigma is calculated from SNR.'
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print*,'If BPOSD=0, no coupling. BPOSD=1, BP output to OSD input.'
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print*,'niter: max BP iterations
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print*,'ndepth: OSD order'
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print*,'s: noise sigma; if negative value is ignored and sigma is calculated from SNR.'
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print*,'nbposd=0, no coupling. nbposd>0, maxsuper=nbposd; nbposd<0, no OSD'
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return
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endif
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call getarg(1,arg)
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read(arg,*) max_iterations
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call getarg(2,arg)
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read(arg,*) ndepth
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call getarg(3,arg)
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read(arg,*) ntrials
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call getarg(4,arg)
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read(arg,*) s
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call getarg(5,arg)
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read(arg,*) Keff
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call getarg(6,arg)
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read(arg,*) nbposd
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endif
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call getarg(1,arg)
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read(arg,*) max_iterations
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call getarg(2,arg)
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read(arg,*) ndepth
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call getarg(3,arg)
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read(arg,*) ntrials
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call getarg(4,arg)
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read(arg,*) s
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call getarg(5,arg)
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read(arg,*) Keff
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call getarg(6,arg)
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read(arg,*) nbposd
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! scale Eb/No for a (174,91) code
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rate=real(Keff)/real(N)
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rate=real(K)/real(N)
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write(*,*) "rate: ",rate
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write(*,*) "niter= ",max_iterations," s= ",s
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write(*,*) "rate: ",rate
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write(*,*) "niter= ",max_iterations," s= ",s
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allocate ( codeword(N), decoded(K), message(K) )
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allocate ( rxdata(N), llr(N) )
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allocate ( codeword(N), decoded(K), message(K) )
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allocate ( rxdata(N), llr(N) )
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msg="K9ABC K1ABC FN20"
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i3=0
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@ -70,8 +71,8 @@ allocate ( rxdata(N), llr(N) )
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write(*,*) 'codeword'
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write(*,'(22(8i1,1x))') codeword
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write(*,*) "Eb/N0 SNR2500 ngood nundetected sigma psymerr"
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do idb = 10,-4,-1
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write(*,*) "Eb/N0 Es/N0 ngood nundetected sigma psymerr"
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do idb = 10,-4,-1
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db=idb/2.0-1.0
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sigma=1/sqrt( 2*rate*(10**(db/10.0)) )
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ngood=0
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@ -110,8 +111,8 @@ do idb = 10,-4,-1
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dmin=0.0
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if(nbposd.eq.0) then
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call osd174_91(llr,Keff,apmask,ndepth,message91,cw,nhardosd,dmin)
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else
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maxsuper=2
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elseif(nbposd.gt.0) then
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maxsuper=nbposd
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call decode174_91(llr,Keff,ndepth,apmask,maxsuper,message91,cw,nhardosd,niterations,ncheck,dmin)
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endif
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! If the decoder finds a valid codeword, nharderrors will be .ge. 0.
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@ -128,16 +129,16 @@ do idb = 10,-4,-1
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nsumerr=nsumerr+nerr
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enddo
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snr2500=db+10.0*log10(rate/(2500*0.16/3))
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esn0=db+10.0*log10(rate)
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pberr=real(nsumerr)/(real(ntrials*N))
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write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,SNR2500,ngood,nue,ss,pberr
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write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,esn0,ngood,nue,ss,pberr
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enddo
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enddo
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open(unit=23,file='nerrhisto.dat',status='unknown')
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do i=1,174
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open(unit=23,file='nerrhisto.dat',status='unknown')
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do i=1,174
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write(23,'(i4,2x,i10,i10,f10.2)') i,nerrdec(i),nerrtot(i),real(nerrdec(i))/real(nerrtot(i)+1e-10)
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enddo
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close(23)
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enddo
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close(23)
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end program ldpcsim174_91
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