mirror of
https://github.com/saitohirga/WSJT-X.git
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New short ping decoding algorithm for msk144 realtime decoder. Not yet enabled.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7108 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
9831fb9cfc
commit
3df371f11b
@ -87,7 +87,7 @@ subroutine msk144decodeframe(c,msgreceived,nsuccess)
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ssig=sqrt(s2av-sav*sav)
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softbits=softbits/ssig
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sigma=0.70
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sigma=0.72
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llr(1:48)=softbits(9:9+47)
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llr(49:128)=softbits(65:65+80-1)
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llr=2.0*llr/(sigma*sigma)
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@ -1,47 +1,43 @@
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subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
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subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fc,fret,tret)
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! msk144 short-ping-decoder
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use timer_module, only: timer
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parameter (NSPM=864, NPTS=3*NSPM, MAXSTEPS=1700, NFFT=NSPM, MAXCAND=5)
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parameter (NSPM=864, MAXSTEPS=100, NFFT=NSPM, MAXCAND=5, NPATTERNS=6)
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character*22 msgreceived
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complex cbig(n)
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complex cdat(NPTS) !Analytic signal
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complex cdat2(NPTS)
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complex cdat(3*NSPM) !Analytic signal
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complex c(NSPM)
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complex ct(NSPM)
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complex ctmp(NFFT)
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complex cb(42) !Complex waveform for sync word
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complex cbr(42) !Complex waveform for reversed sync word
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complex cfac,cca,ccb
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complex cc(NPTS)
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complex ccr(NPTS)
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complex cc1(NPTS)
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complex cc2(NPTS)
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complex ccr1(NPTS)
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complex ccr2(NPTS)
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complex bb(6)
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integer s8(8),s8r(8)
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integer, dimension(1) :: iloc
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integer indices(MAXSTEPS)
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integer ipeaks(10)
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integer npkloc(10)
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integer navpatterns(3,NPATTERNS)
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integer navmask(3)
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integer nstart(MAXCAND)
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logical ismask(NFFT)
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real cbi(42),cbq(42)
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real detmet(-2:MAXSTEPS+3)
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real detmet2(-2:MAXSTEPS+3)
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real detfer(MAXSTEPS)
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real rcw(12)
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real dd(NPTS)
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real ferrs(MAXCAND)
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real pp(12) !Half-sine pulse shape
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real snrs(MAXCAND)
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real times(MAXCAND)
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real tonespec(NFFT)
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real tpat(NPATTERNS)
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real*8 dt, df, fs, pi, twopi
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logical first
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data first/.true./
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data s8/0,1,1,1,0,0,1,0/
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data s8r/1,0,1,1,0,0,0,1/
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save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,nmatchedfilter
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data navpatterns/ &
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0,1,0, &
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1,0,0, &
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0,0,1, &
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1,1,0, &
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0,1,1, &
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1,1,1/
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data tpat/1.5,0.5,2.5,1.0,2.0,1.5/
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save df,first,fs,pi,twopi,dt,tframe,rcw
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if(first) then
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nmatchedfilter=1
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@ -51,40 +47,19 @@ subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
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fs=12000.0
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dt=1.0/fs
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df=fs/NFFT
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tframe=NSPM/fs
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do i=1,12
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angle=(i-1)*pi/12.0
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pp(i)=sin(angle)
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rcw(i)=(1-cos(angle))/2
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enddo
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! define the sync word waveforms
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s8=2*s8-1
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cbq(1:6)=pp(7:12)*s8(1)
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cbq(7:18)=pp*s8(3)
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cbq(19:30)=pp*s8(5)
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cbq(31:42)=pp*s8(7)
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cbi(1:12)=pp*s8(2)
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cbi(13:24)=pp*s8(4)
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cbi(25:36)=pp*s8(6)
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cbi(37:42)=pp(1:6)*s8(8)
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cb=cmplx(cbi,cbq)
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s8r=2*s8r-1
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cbq(1:6)=pp(7:12)*s8r(1)
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cbq(7:18)=pp*s8r(3)
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cbq(19:30)=pp*s8r(5)
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cbq(31:42)=pp*s8r(7)
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cbi(1:12)=pp*s8r(2)
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cbi(13:24)=pp*s8r(4)
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cbi(25:36)=pp*s8r(6)
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cbi(37:42)=pp(1:6)*s8r(8)
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cbr=cmplx(cbi,cbq)
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first=.false.
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endif
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! fill the detmet, detferr arrays
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nstep=(n-NPTS)/216 ! 72ms/4=18ms steps
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nstep=(n-NSPM)/216 ! 72ms/4=18ms steps
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detmet=0
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detmet2=0
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detfer=-999.99
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@ -148,15 +123,13 @@ subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
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do ip=1,MAXCAND ! Find candidates
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iloc=maxloc(detmet(1:nstep))
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il=iloc(1)
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! if( (detmet(il) .lt. 4.0) ) exit
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if( (detmet(il) .lt. 3.0) ) exit
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if( abs(detfer(il)) .le. ntol ) then
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ndet=ndet+1
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times(ndet)=((il-1)*216+NSPM/2)*dt
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nstart(ndet)=1+(il-1)*216+1
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ferrs(ndet)=detfer(il)
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snrs(ndet)=12.0*log10(detmet(il))/2-9.0
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endif
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! detmet(max(1,il-1):min(nstep,il+1))=0.0
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detmet(il)=0.0
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enddo
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@ -167,146 +140,53 @@ subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
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if( (detmet2(il) .lt. 12.0) ) exit
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if( abs(detfer(il)) .le. ntol ) then
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ndet=ndet+1
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times(ndet)=((il-1)*216+NSPM/2)*dt
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nstart(ndet)=1+(il-1)*216+1
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ferrs(ndet)=detfer(il)
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snrs(ndet)=12.0*log10(detmet2(il))/2-9.0
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endif
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! detmet2(max(1,il-1):min(nstep,il+1))=0.0
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detmet2(il)=0.0
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enddo
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endif
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nsuccess=0
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msgreceived=' '
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do ip=1,ndet ! Try to sync/demod/decode each candidate.
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imid=times(ip)*fs
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if( imid .lt. NPTS/2 ) imid=NPTS/2
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if( imid .gt. n-NPTS/2 ) imid=n-NPTS/2
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cdat=cbig(imid-NPTS/2+1:imid+NPTS/2)
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ferr=ferrs(ip)
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! remove coarse freq error - should now be within a few Hz
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call tweak1(cdat,NPTS,-(1500+ferr),cdat)
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! attempt frame synchronization
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! correlate with sync word waveforms
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cc=0
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ccr=0
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cc1=0
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cc2=0
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ccr1=0
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ccr2=0
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do i=1,NPTS-(56*6+41)
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cc1(i)=sum(cdat(i:i+41)*conjg(cb))
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cc2(i)=sum(cdat(i+56*6:i+56*6+41)*conjg(cb))
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enddo
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cc=cc1+cc2
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dd=abs(cc1)*abs(cc2)
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cmax=maxval(abs(cc))
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! Find 6 largest peaks
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do ipk=1, 6
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iloc=maxloc(abs(cc))
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ic1=iloc(1)
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iloc=maxloc(dd)
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ic2=iloc(1)
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ipeaks(ipk)=ic2
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dd(max(1,ic2-7):min(NPTS-56*6-41,ic2+7))=0.0
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enddo
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do ipk=1,4
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! we want ic to be the index of the first sample of the frame
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ic0=ipeaks(ipk)
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! fine adjustment of sync index
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do i=1,6
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if( ic0+11+NSPM .le. NPTS ) then
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bb(i) = sum( ( cdat(ic0+i-1+6:ic0+i-1+6+NSPM:6) * conjg( cdat(ic0+i-1:ic0+i-1+NSPM:6) ) )**2 )
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else
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bb(i) = sum( ( cdat(ic0+i-1+6:NPTS:6) * conjg( cdat(ic0+i-1:NPTS-6:6) ) )**2 )
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npeaks=2
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ntol0=8
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ndf=2
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do icand=1,ndet ! Try to sync/demod/decode each candidate.
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ib=max(1,nstart(icand)-NSPM)
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ie=ib-1+3*NSPM
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if( ie .gt. n ) then
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ie=n
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ib=ie-3*NSPM+1
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endif
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enddo
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iloc=maxloc(abs(bb))
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ibb=iloc(1)
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bba=abs(bb(ibb))
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bbp=atan2(-imag(bb(ibb)),-real(bb(ibb)))/(2*twopi*6*dt)
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if( ibb .le. 3 ) ibb=ibb-1
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if( ibb .gt. 3 ) ibb=ibb-7
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cdat=cbig(ib:ie)
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fo=fc+ferrs(icand)
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do iav=1,NPATTERNS
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navmask=navpatterns(1:3,iav)
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call msk144sync(cdat,3,ntol0,ndf,navmask,npeaks,fo,fest,npkloc,nsyncsuccess,c)
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do id=1,3 ! Slicer dither.
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if( id .eq. 1 ) is=0
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if( id .eq. 2 ) is=-1
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if( id .eq. 3 ) is=1
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if( nsyncsuccess .eq. 0 ) cycle
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! Adjust frame index to place peak of bb at desired lag
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ic=ic0+ibb+is
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if( ic .lt. 1 ) ic=ic+864
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do ipk=1,npeaks
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do is=1,3
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ic0=npkloc(ipk)
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if( is.eq.2) ic0=max(1,ic0-1)
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if( is.eq.3) ic0=min(NSPM,ic0+1)
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ct=cshift(c,ic0-1)
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call msk144decodeframe(ct,msgreceived,ndecodesuccess)
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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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if( ic+56*6+41 .le. NPTS ) then
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ccb=sum(cdat(ic+56*6:ic+56*6+41)*conjg(cb))
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cfac=ccb*conjg(cca)
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ferr2=atan2(imag(cfac),real(cfac))/(twopi*56*6*dt)
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else
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ccb=sum(cdat(ic-88*6:ic-88*6+41)*conjg(cb))
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cfac=cca*conjg(ccb)
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ferr2=atan2(imag(cfac),real(cfac))/(twopi*88*6*dt)
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endif
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! Final estimate of the carrier frequency - returned to the calling program
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fest=1500+ferr+ferr2
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do idf=0,4 ! frequency jitter
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if( idf .eq. 0 ) then
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deltaf=0.0
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elseif( mod(idf,2) .eq. 0 ) then
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deltaf=idf
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else
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deltaf=-(idf+1)
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endif
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! Remove fine frequency error
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call tweak1(cdat,NPTS,-(ferr2+deltaf),cdat2)
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! place the beginning of frame at index NSPM+1
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cdat2=cshift(cdat2,ic-(NSPM+1))
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do iav=1,8 ! Hopefully we can eliminate some of these after looking at more examples
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if( iav .eq. 1 ) then
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c=cdat2(NSPM+1:2*NSPM)
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elseif( iav .eq. 2 ) then
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c=cdat2(NSPM-431:NSPM+432)
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c=cshift(c,-432)
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elseif( iav .eq. 3 ) then
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c=cdat2(2*NSPM-431:2*NSPM+432)
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c=cshift(c,-432)
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elseif( iav .eq. 4 ) then
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c=cdat2(1:NSPM)
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elseif( iav .eq. 5 ) then
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c=cdat2(2*NSPM+1:NPTS)
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elseif( iav .eq. 6 ) then
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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
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elseif( iav .eq. 7 ) then
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c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
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elseif( iav .eq. 8 ) then
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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
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endif
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call msk144decodeframe(c,msgreceived,nsuccess)
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if( nsuccess .eq. 1 ) then
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fret=1500+ferrs(ip)
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snrret=snrs(ip)
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tret=times(ip)
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if( ndecodesuccess .gt. 0 ) then
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tret=(nstart(icand)+NSPM/2)/fs
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fret=fest
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!write(*,*) icand, iav, ipk, is, tret, fret, msgreceived
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nsuccess=1
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return
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endif
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enddo ! frame averaging loop
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enddo ! frequency dithering loop
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enddo ! sample-time dither loop
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enddo ! peak loop
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enddo
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enddo
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enddo
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enddo ! candidate loop
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return
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end subroutine msk144spd
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@ -1,8 +1,8 @@
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subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
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subroutine msk144sync(cdat,nframes,ntol,ndf,navmask,npeaks,fc,fest,npklocs,nsuccess,c)
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parameter (NSPM=864)
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complex cdat(n)
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complex cdat2(n)
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complex cdat(NSPM*nframes)
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complex cdat2(NSPM*nframes)
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complex c(NSPM) !Coherently averaged complex data
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complex ct2(2*NSPM)
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complex cs(NSPM)
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@ -12,7 +12,7 @@ subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
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integer s8(8)
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integer iloc(1)
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integer npklocs(npeaks)
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integer navmask(8) ! defines which frames to average
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integer navmask(nframes) ! defines which frames to average
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real cbi(42),cbq(42)
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real pkamps(npeaks)
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@ -54,11 +54,12 @@ subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
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navg=sum(navmask)
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xmax=0.0
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bestf=0.0
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n=nframes*NSPM
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do ifr=-ntol,ntol,ndf !Find freq that maximizes sync
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ferr=ifr
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call tweak1(cdat,n,-(1500+ferr),cdat2)
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call tweak1(cdat,n,-(fc+ferr),cdat2)
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c=0
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do i=1,8
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do i=1,nframes
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ib=(i-1)*NSPM+1
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ie=ib+NSPM-1
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if( navmask(i) .eq. 1 ) then
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@ -83,7 +84,7 @@ subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
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endif
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enddo
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fest=1500+bestf
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fest=fc+bestf
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c=cs
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xcc=xccs
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@ -78,6 +78,8 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
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pnoise=-1.0
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endif
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fc=1500.0 !!! This will eventually come from the Rx Freq GUI box.
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!!! Dupe checking should probaby be moved to mainwindow.cpp
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if( nutc00 .ne. nutc0 ) then ! reset dupe checker
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msglast=' '
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@ -109,8 +111,10 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
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enddo
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pavg=sum(pow)/7.0
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np=7*NSPM
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call msk144spd(cdat,np,ntol,nsuccess,msgreceived,fest,snr,tdec)
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np=8*NSPM
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call msk144spd(cdat,np,ntol,nsuccess,msgreceived,fc,fest,tdec)
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if( nsuccess .eq. 1 ) then
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tdec=tsec+tdec
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decsym=' & '
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@ -120,10 +124,9 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
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do iavg=1,NPATTERNS
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iavmask=iavpatterns(1:8,iavg)
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navg=sum(iavmask)
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! ndf=nint(7.0/navg) + 1
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ndf=nint(7.0/navg)
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npeaks=2
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call msk144sync(cdat(1:7*NSPM),7*864,ntol,ndf,iavmask,npeaks,fest,npkloc,nsyncsuccess,c)
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call msk144sync(cdat(1:8*NSPM),8,ntol,ndf,iavmask,npeaks,fc,fest,npkloc,nsyncsuccess,c)
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if( nsyncsuccess .eq. 0 ) cycle
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do ipk=1,npeaks
|
||||
@ -146,7 +149,7 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
|
||||
msgreceived=' '
|
||||
|
||||
! no decode - update noise level estimate used for calculating displayed snr.
|
||||
! no decode - update noise level used for calculating displayed snr.
|
||||
if( pnoise .lt. 0 ) then ! initialize noise level
|
||||
pnoise=pavg
|
||||
elseif( pavg .gt. pnoise ) then ! noise level is slow to rise
|
||||
@ -154,11 +157,12 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
elseif( pavg .lt. pnoise ) then ! and quick to fall
|
||||
pnoise=pavg
|
||||
endif
|
||||
|
||||
return
|
||||
|
||||
999 continue
|
||||
|
||||
! successful decode - estimate snr
|
||||
! successful decode - estimate snr !!! noise estimate needs work
|
||||
if( pnoise .gt. 0.0 ) then
|
||||
snr0=10.0*log10(pmax/pnoise-1.0)
|
||||
else
|
||||
@ -177,3 +181,4 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
1020 format(i6.6,i4,f5.1,i5,a3,a22,a1)
|
||||
return
|
||||
end subroutine mskrtd
|
||||
|
||||
|
||||
@ -5,6 +5,7 @@ subroutine tweak1(ca,jz,f0,cb)
|
||||
complex ca(jz),cb(jz)
|
||||
real*8 twopi
|
||||
complex*16 w,wstep
|
||||
complex w4
|
||||
data twopi/0.d0/
|
||||
save twopi
|
||||
|
||||
|
||||
@ -2964,7 +2964,7 @@ void MainWindow::guiUpdate()
|
||||
|
||||
//Once per second:
|
||||
if(nsec != m_sec0) {
|
||||
qDebug() << m_config.contestMode() << m_config.realTimeDecode();
|
||||
// qDebug() << m_config.contestMode() << m_config.realTimeDecode();
|
||||
g_single_decode=m_config.single_decode();
|
||||
if(m_auto and m_mode=="Echo" and m_bEchoTxOK) {
|
||||
progressBar.setMaximum(6);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user