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Added msk144dt; tweaks to syncmsk144l
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6743 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
4425a5aad9
commit
0679069878
@ -39,9 +39,9 @@ subroutine msk144_decode(id2,npts,nutc,nprint,line)
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!### Would it be better to set median rms to 1.0 ?
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! d(0:npts-1)=d(0:npts-1)/rms !Normalize so that rms=1.0
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call mskdt(d,npts,ty,yellow,nyel)
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call msk144dt(d,npts,ty,yellow,nyel)
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nyel=min(nyel,100)
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nyel=min(nyel,20)
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n=log(float(npts))/log(2.0) + 1.0
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nfft=min(2**n,1024*1024)
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@ -58,21 +58,24 @@ subroutine msk144_decode(id2,npts,nutc,nprint,line)
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iz=ib-ia+1
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cdat2(1:iz)=c(ia:ib) !Select nlen complex samples
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t0=ia/12000.0
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call syncmsk144(cdat2,iz,msg,freq)
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call syncmsk144(cdat2,iz,msg,freq,nutc,t0)
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if(msg(1:1).ne.' ') then
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! if(msg.ne.msg0) then
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if(msg.ne.msg0) then
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nline=nline+1
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nsnr0=-99
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! endif
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y=10.0**(0.1*(yellow(n)-1.5))
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nsnr=max(-5,nint(db(y)))
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! if(nsnr.gt.nsnr0 .and. nline.gt.0) then
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endif
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! y=10.0**(0.1*(yellow(n)-1.5))
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! nsnr=max(-5,nint(db(y)))
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y=yellow(n)-1.5
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nsnr=y*10 ! this should be 10*db (centibels?)
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if( nsnr .gt. 999 ) nsnr=99
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if(nsnr.gt.nsnr0 .and. nline.gt.0) then
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write(line(nline),1020) nutc,nsnr,t0,nint(freq),msg
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if(nprint.ne.0) write(*,1020) nutc,nsnr,t0,nint(freq),msg
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1020 format(i6.6,i4,f5.1,i5,' & ',a22)
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nsnr0=nsnr
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! go to 900
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! endif
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go to 900
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endif
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msg0=msg
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endif
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enddo
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@ -62,8 +62,7 @@ subroutine mskdt(d,npts,ty,yellow,nyel)
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do j=2,nyel
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ok=.true.
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do i=1,j-1
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! if(abs(ty(i)-ty(j)).lt.0.117) ok=.false.
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if(abs(ty(i)-ty(j)).lt.0.072) ok=.false. ! does this break jtmsk?
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if(abs(ty(i)-ty(j)).lt.0.117) ok=.false.
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enddo
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if(ok) then
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k=k+1
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@ -1,4 +1,4 @@
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subroutine syncmsk144(cdat,npts,msgreceived,fest)
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subroutine syncmsk144(cdat,npts,msgreceived,fest,nutc,t0) !nutc and t0 are for debug output
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use iso_c_binding, only: c_loc,c_size_t
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use packjt
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use hashing
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@ -107,6 +107,10 @@ subroutine syncmsk144(cdat,npts,msgreceived,fest)
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endif
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else
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msgreceived=' '
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phase0=-97 !-97 is failed carrier sync, -98 failure to decode, -99 decoded, bad hash
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niterations=0
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ndither=0
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i1hashdec=0
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goto 999
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endif
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@ -174,15 +178,6 @@ subroutine syncmsk144(cdat,npts,msgreceived,fest)
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if( ic .le. 864 ) ic=ic+864
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if( ic .gt. 2*864 ) ic=ic-864
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! Sanity check - recompute bb and verify that peak is now at designated lag.
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! do i=1,6
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! io=i-3
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! bb(i) = sum( ( cdat(ic+io:ic+io+864:6) * conjg( cdat(ic+io+6:ic+io+6+864:6) ) )*2 )
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! enddo
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! iloc=maxloc(abs(bb))
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! ibb=iloc(1)
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! write(*,*) 'ic1: ',ic,'bb peak is at : ',ibb
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! Estimate fine frequency error.
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! Should a larger separation be used when frames are averaged?
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cca=sum(cdat(ic:ic+41)*conjg(cb))
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@ -238,11 +233,10 @@ subroutine syncmsk144(cdat,npts,msgreceived,fest)
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enddo
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! calculated the number of sync-word bits that are incorrect
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! this might come in handy some day
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nbadsync=sum(s8*(2*hardbits(1:8)-1))
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nbadsync=nbadsync+sum(s8*(2*hardbits(57:57+7)-1))
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nbadsync=16-nbadsync
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! don't present to the decoder if there are too many sync-word bit-errors
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nbadsync1=(8-sum(s8*(2*hardbits(1:8)-1)))/2
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nbadsync2=(8-sum(s8*(2*hardbits(57:57+7)-1)))/2
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nbadsync=nbadsync1+nbadsync2
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if( nbadsync .gt. 6 ) cycle
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! this could be used to count the number of hard errors that were corrected
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@ -257,7 +251,8 @@ subroutine syncmsk144(cdat,npts,msgreceived,fest)
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ssig=sqrt(s2av-sav*sav)
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softbits=softbits/ssig
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sigma=0.65
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! sigma=0.65
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sigma=0.70
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lratio(1:48)=softbits(9:9+47)
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lratio(49:128)=softbits(65:65+80-1)
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lratio=exp(2.0*lratio/(sigma*sigma))
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@ -266,7 +261,7 @@ subroutine syncmsk144(cdat,npts,msgreceived,fest)
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unscrambledsoftbits(2:128:2)=lratio(65:128)
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max_iterations=10
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max_dither=100
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max_dither=50
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call ldpc_decode(unscrambledsoftbits, decoded, max_iterations, niterations, max_dither, ndither)
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if( niterations .ge. 0.0 ) then
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@ -278,6 +273,8 @@ enddo
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enddo
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msgreceived=' '
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phase0=-98
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i1hashdec=0
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goto 999
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778 continue
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@ -310,10 +307,13 @@ goto 999
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call unpackmsg(i4Dec6BitWords,msgreceived)
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else
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msgreceived=' '
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phase0=-99
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endif
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write(78,1001) iav,ipk,is,fdiff,fest,nbadsync,phase0,niterations,ndither,i1hashdec,i1Dec8BitBytes(10),msgreceived
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1001 format(i6,i6,i6,f10.1,f10.1,i6,f10.2,i6,i6,i6,i6,4x,a22)
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999 return
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999 continue
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write(78,1001) nutc,t0,iav,ipk,is,fdiff,fest,nbadsync1,nbadsync2, &
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phase0,niterations,ndither,i1hashdec,i1Dec8BitBytes(10),msgreceived
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1001 format(i6,f8.2,i4,i4,i4,f8.2,f8.2,i4,i4,f8.2,i4,i4,i4,i4,2x,a22)
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return
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end subroutine syncmsk144
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