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First steps toward realtime short ping decoder for MSK40.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7139 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
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commit
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194
lib/msk40spd.f90
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194
lib/msk40spd.f90
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@ -0,0 +1,194 @@
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subroutine msk40spd(cbig,n,ntol,nsuccess,msgreceived,fc,fret,tret)
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! msk40 short-ping-decoder
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use timer_module, only: timer
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parameter (NSPM=240, 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(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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integer, dimension(1) :: iloc
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integer indices(MAXSTEPS)
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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 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 ferrs(MAXCAND)
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real snrs(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 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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! define half-sine pulse and raised-cosine edge window
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pi=4d0*datan(1d0)
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twopi=8d0*datan(1d0)
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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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rcw(i)=(1-cos(angle))/2
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enddo
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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-NSPM)/60 ! 20ms/4=5ms steps
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detmet=0
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detmet2=0
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detfer=-999.99
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nfhi=2*(fc+500)
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nflo=2*(fc-500)
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ihlo=(nfhi-2*ntol)/df+1
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ihhi=(nfhi+2*ntol)/df+1
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illo=(nflo-2*ntol)/df+1
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ilhi=(nflo+2*ntol)/df+1
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i2000=nflo/df+1
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i4000=nfhi/df+1
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do istp=1,nstep
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ns=1+60*(istp-1)
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ne=ns+NSPM-1
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if( ne .gt. n ) exit
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ctmp=cmplx(0.0,0.0)
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ctmp(1:NSPM)=cbig(ns:ne)
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! Coarse carrier frequency sync - seek tones at 2000 Hz and 4000 Hz in
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! squared signal spectrum.
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! search range for coarse frequency error is +/- 100 Hz
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ctmp=ctmp**2
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ctmp(1:12)=ctmp(1:12)*rcw
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ctmp(NSPM-11:NSPM)=ctmp(NSPM-11:NSPM)*rcw(12:1:-1)
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call four2a(ctmp,NFFT,1,-1,1)
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tonespec=abs(ctmp)**2
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ismask=.false.
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ismask(ihlo:ihhi)=.true. ! high tone search window
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iloc=maxloc(tonespec,ismask)
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ihpk=iloc(1)
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deltah=-real( (ctmp(ihpk-1)-ctmp(ihpk+1)) / (2*ctmp(ihpk)-ctmp(ihpk-1)-ctmp(ihpk+1)) )
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ah=tonespec(ihpk)
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ahavp=(sum(tonespec,ismask)-ah)/count(ismask)
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trath=ah/(ahavp+0.01)
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ismask=.false.
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ismask(illo:ilhi)=.true. ! window for low tone
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iloc=maxloc(tonespec,ismask)
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ilpk=iloc(1)
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deltal=-real( (ctmp(ilpk-1)-ctmp(ilpk+1)) / (2*ctmp(ilpk)-ctmp(ilpk-1)-ctmp(ilpk+1)) )
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al=tonespec(ilpk)
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alavp=(sum(tonespec,ismask)-al)/count(ismask)
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tratl=al/(alavp+0.01)
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fdiff=(ihpk+deltah-ilpk-deltal)*df
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ferrh=(ihpk+deltah-i4000)*df/2.0
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ferrl=(ilpk+deltal-i2000)*df/2.0
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if( ah .ge. al ) then
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ferr=ferrh
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else
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ferr=ferrl
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endif
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detmet(istp)=max(ah,al)
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detmet2(istp)=max(trath,tratl)
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detfer(istp)=ferr
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enddo ! end of detection-metric and frequency error estimation loop
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call indexx(detmet(1:nstep),nstep,indices) !find median of detection metric vector
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xmed=detmet(indices(nstep/4))
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detmet=detmet/xmed ! noise floor of detection metric is 1.0
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ndet=0
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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. 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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nstart(ndet)=1+(il-1)*60+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(il)=0.0
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enddo
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if( ndet .lt. 3 ) then
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do ip=1,MAXCAND-ndet ! Find candidates
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iloc=maxloc(detmet2(1:nstep))
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il=iloc(1)
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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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nstart(ndet)=1+(il-1)*60+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(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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npeaks=2
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ntol0=29
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deltaf=7.2
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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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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 msk40sync(cdat,3,ntol0,deltaf,navmask,npeaks,fo,fest,npkloc,nsyncsuccess,c)
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if( nsyncsuccess .eq. 0 ) cycle
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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 msk40decodeframe(ct,msgreceived,ndecodesuccess)
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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
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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 msk40spd
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113
lib/msk40sync.f90
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113
lib/msk40sync.f90
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@ -0,0 +1,113 @@
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subroutine msk40sync(cdat,nframes,ntol,delf,navmask,npeaks,fc,fest, &
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npklocs,nsuccess,c)
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!$ use omp_lib
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parameter (NSPM=240)
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complex cdat(NSPM*nframes)
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complex cdat2(NSPM*nframes,8)
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complex c(NSPM) !Coherently averaged complex data
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complex cs(NSPM,8)
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complex cb(42) !Complex waveform for sync word
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! integer*8 count0,count1,clkfreq
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integer s8r(8)
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integer iloc(1)
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integer npklocs(npeaks)
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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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real xcc(0:NSPM-1)
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real xccs(0:NSPM-1,8)
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real xm(8)
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real bf(8)
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real pp(12) !Half-sine pulse shape
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logical first
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data first/.true./
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data s8r/0,1,0,0,1,1,1,0/
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save first,cb,fs,pi,twopi,dt,s8,pp
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! call system_clock(count0,clkfreq)
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if(first) then
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pi=4.0*atan(1.0)
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twopi=8.0*atan(1.0)
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fs=12000.0
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dt=1.0/fs
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do i=1,12 !Define half-sine pulse
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angle=(i-1)*pi/12.0
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pp(i)=sin(angle)
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enddo
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! Define the sync word waveforms
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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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cb=cmplx(cbi,cbq)
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first=.false.
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endif
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nfreqs=2*nint(ntol/delf) + 1
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xm=0.0
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bf=0.0
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nthreads=1
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!$ nthreads=min(8,int(OMP_GET_MAX_THREADS(),4))
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nstep=nfreqs/nthreads
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!$OMP PARALLEL NUM_THREADS(nthreads) PRIVATE(id,if1,if2)
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id=1
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!$ id=OMP_GET_THREAD_NUM() + 1 !Thread id = 1,2,...
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if1=-nint(ntol/delf) + (id-1)*nstep
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if2=if1+nstep-1
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if(id.eq.nthreads) if2=nint(ntol/delf)
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call msk40_freq_search(cdat,fc,if1,if2,delf,nframes,navmask,cb, &
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cdat2(1,id),xm(id),bf(id),cs(1,id),xccs(1,id))
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! write(73,3002) id,if1,if2,nfreqs,nthreads,bf(id),xm(id)
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!3002 format(5i5,2f10.3)
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!$OMP END PARALLEL
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xmax=xm(1)
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fest=fc+bf(1)
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c=cs(1:NSPM,1)
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xcc=xccs(0:NSPM-1,1)
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if(nthreads.gt.1) then
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do i=2,nthreads
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if(xm(i).gt.xmax) then
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xmax=xm(i)
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fest=fc+bf(i)
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c=cs(1:NSPM,i)
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xcc=xccs(0:NSPM-1,i)
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endif
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enddo
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endif
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! Find npeaks largest peaks
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do ipk=1,npeaks
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iloc=maxloc(xcc)
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ic2=iloc(1)
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npklocs(ipk)=ic2
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pkamps(ipk)=xcc(ic2-1)
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xcc(max(0,ic2-7):min(NSPM-1,ic2+7))=0.0
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enddo
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if( xmax .lt. 0.7 ) then
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nsuccess=0
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else
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nsuccess=1
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endif
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! call system_clock(count1,clkfreq)
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! t=float(count1-count0)/clkfreq
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! write(72,3001) nfreqs,OMP_GET_MAX_THREADS(),nthreads,t
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!3001 format(3i6,f8.3)
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return
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end subroutine msk40sync
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