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WSJT-X
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Fix problems with ldpc174_91.f90

This commit is contained in:
Steven Franke 2020-05-05 08:05:58 -05:00
parent 6363f3fd43
commit 82e66f3251
1 changed files with 120 additions and 119 deletions
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21
lib/fsk4hf/ldpcsim174_91.f90
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@ -22,11 +22,12 @@ nerrdec=0
nargs=iargc()
if(nargs.ne.6) then
print*,'Usage: ldpcsim niter ndepth #trials s Keff BPOSD'
print*,'Usage: ldpcsim niter ndepth #trials s Keff nbposd'
print*,'eg: ldpcsim 10 2 1000 0.84 91 1'
print*,'belief propagation iterations: niter, ordered-statistics depth: ndepth'
print*,'If s is negative, then value is ignored and sigma is calculated from SNR.'
print*,'If BPOSD=0, no coupling. BPOSD=1, BP output to OSD input.'
print*,'niter: max BP iterations
print*,'ndepth: OSD order'
print*,'s: noise sigma; if negative value is ignored and sigma is calculated from SNR.'
print*,'nbposd=0, no coupling. nbposd>0, maxsuper=nbposd; nbposd<0, no OSD'
return
endif
call getarg(1,arg)
@ -43,7 +44,7 @@ call getarg(6,arg)
read(arg,*) nbposd
! scale Eb/No for a (174,91) code
rate=real(Keff)/real(N)
rate=real(K)/real(N)
write(*,*) "rate: ",rate
write(*,*) "niter= ",max_iterations," s= ",s
@ -70,7 +71,7 @@ allocate ( rxdata(N), llr(N) )
write(*,*) 'codeword'
write(*,'(22(8i1,1x))') codeword
write(*,*) "Eb/N0 SNR2500 ngood nundetected sigma psymerr"
write(*,*) "Eb/N0 Es/N0 ngood nundetected sigma psymerr"
do idb = 10,-4,-1
db=idb/2.0-1.0
sigma=1/sqrt( 2*rate*(10**(db/10.0)) )
@ -110,8 +111,8 @@ do idb = 10,-4,-1
dmin=0.0
if(nbposd.eq.0) then
call osd174_91(llr,Keff,apmask,ndepth,message91,cw,nhardosd,dmin)
else
maxsuper=2
elseif(nbposd.gt.0) then
maxsuper=nbposd
call decode174_91(llr,Keff,ndepth,apmask,maxsuper,message91,cw,nhardosd,niterations,ncheck,dmin)
endif
! If the decoder finds a valid codeword, nharderrors will be .ge. 0.
@ -128,9 +129,9 @@ do idb = 10,-4,-1
nsumerr=nsumerr+nerr
enddo
snr2500=db+10.0*log10(rate/(2500*0.16/3))
esn0=db+10.0*log10(rate)
pberr=real(nsumerr)/(real(ntrials*N))
write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,SNR2500,ngood,nue,ss,pberr
write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,esn0,ngood,nue,ss,pberr
enddo