mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-22 04:11:16 -05:00
Remove some dead code.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7432 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
f30311f324
commit
2c2d31ea8d
@ -329,8 +329,6 @@ set (wsjt_FSRCS
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lib/deg2grid.f90
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lib/degrade_snr.f90
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lib/demod64a.f90
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lib/detectmsk144.f90
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lib/detectmsk40.f90
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lib/determ.f90
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lib/downsam9.f90
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lib/encode232.f90
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@ -409,7 +407,6 @@ set (wsjt_FSRCS
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lib/moondopjpl.f90
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lib/morse.f90
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lib/move.f90
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lib/msk144d.f90
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lib/msk144d2.f90
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lib/msk40decodeframe.f90
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lib/msk144decodeframe.f90
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@ -425,7 +422,6 @@ set (wsjt_FSRCS
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lib/msk144sim.f90
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lib/mskrtd.f90
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lib/options.f90
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lib/opdetmsk144.f90
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lib/packjt.f90
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lib/pctile.f90
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lib/peakdt9.f90
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@ -1074,9 +1070,6 @@ target_link_libraries (ldpcsim144 wsjt_fort wsjt_cxx)
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add_executable (msk144sim lib/msk144sim.f90 wsjtx.rc)
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target_link_libraries (msk144sim wsjt_fort wsjt_cxx)
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add_executable (msk144d lib/msk144d.f90 wsjtx.rc)
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target_link_libraries (msk144d wsjt_fort wsjt_cxx)
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add_executable (msk144d2 lib/msk144d2.f90 wsjtx.rc)
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target_link_libraries (msk144d2 wsjt_fort wsjt_cxx)
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@ -1,425 +0,0 @@
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subroutine detectmsk144(cbig,n,lines,nmessages,nutc,ntol,t00)
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use timer_module, only: timer
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parameter (NSPM=864, NPTS=3*NSPM, MAXSTEPS=1700, NFFT=NSPM, MAXCAND=16)
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character*22 msgreceived,allmessages(20)
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character*80 lines(100)
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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 c(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),hardbits(144)
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integer, dimension(1) :: iloc
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integer*1 decoded(80)
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integer indices(MAXSTEPS)
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integer ipeaks(10)
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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 ddr(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*8 dt, df, fs, pi, twopi
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real softbits(144)
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real*8 lratio(128)
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real llr(128)
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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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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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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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detmet=0
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detmet2=0
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detfer=-999.99
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do istp=1,nstep
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ns=1+216*(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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ihlo=(4000-2*ntol)/df+1
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ihhi=(4000+2*ntol)/df+1
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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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illo=(2000-2*ntol)/df+1
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ilhi=(2000+2*ntol)/df+1
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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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i2000=2000/df+1
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i4000=4000/df+1
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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. 4.0) ) 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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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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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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times(ndet)=((il-1)*216+NSPM/2)*dt
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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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nmessages=0
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allmessages=char(0)
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lines=char(0)
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nshort=0
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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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t0=times(ip) + t00
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cdat=cbig(imid-NPTS/2+1:imid+NPTS/2)
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ferr=ferrs(ip)
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nsnr=2*nint(snrs(ip)/2.0)
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if( nsnr .lt. -4 ) nsnr=-4
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if( nsnr .gt. 24 ) nsnr=24
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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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! do i=1,NPTS-(40*6+41)
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! ccr1(i)=sum(cdat(i:i+41)*conjg(cbr))
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! ccr2(i)=sum(cdat(i+40*6:i+40*6+41)*conjg(cbr))
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! enddo
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! ccr=ccr1+ccr2
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! ddr=abs(ccr1)*abs(ccr2)
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cmax=maxval(abs(cc))
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! crmax=maxval(abs(ccr))
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! if( crmax .gt. cmax ) then
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! nshort=nshort+1
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! endif
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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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! ipeaks(ipk)=ic1
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! cc(max(1,ic1-7):min(NPTS-56*6-41,ic1+7))=0.0
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!write(*,*) ipk,ic2
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enddo
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do ipk=1,6
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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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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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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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! 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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! 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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! Estimate final frequency error and carrier phase.
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cca=sum(c(1:1+41)*conjg(cb))
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ccb=sum(c(1+56*6:1+56*6+41)*conjg(cb))
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cfac=ccb*conjg(cca)
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ffin=atan2(imag(cfac),real(cfac))/(twopi*56*6*dt)
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phase0=atan2(imag(cca+ccb),real(cca+ccb))
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do ipha=1,1
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if( ipha.eq.2 ) phase0=phase0+30*pi/180.0
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if( ipha.eq.3 ) phase0=phase0-30*pi/180.0
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! Remove phase error - want constellation rotated so that sample points lie on I/Q axes
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cfac=cmplx(cos(phase0),sin(phase0))
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c=c*conjg(cfac)
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if( nmatchedfilter .eq. 0 ) then
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! sample to get softsamples
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do i=1,72
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softbits(2*i-1)=imag(c(1+(i-1)*12))
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softbits(2*i)=real(c(7+(i-1)*12))
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enddo
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else
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! matched filter -
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! how much mismatch does the RX/TX/analytic filter cause?, how rig (pair) dependent is this loss?
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softbits(1)=sum(imag(c(1:6))*pp(7:12))+sum(imag(c(864-5:864))*pp(1:6))
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softbits(2)=sum(real(c(1:12))*pp)
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do i=2,72
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softbits(2*i-1)=sum(imag(c(1+(i-1)*12-6:1+(i-1)*12+5))*pp)
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softbits(2*i)=sum(real(c(7+(i-1)*12-6:7+(i-1)*12+5))*pp)
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enddo
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endif
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! sync word hard error weight is a good discriminator for
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! frames that have reasonable probability of decoding
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hardbits=0
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do i=1,144
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if( softbits(i) .ge. 0.0 ) then
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hardbits(i)=1
|
||||
endif
|
||||
enddo
|
||||
nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8 ) )/2
|
||||
nbadsync2=(8-sum( (2*hardbits(1+56:8+56)-1)*s8 ) )/2
|
||||
nbadsync=nbadsync1+nbadsync2
|
||||
if( nbadsync .gt. 4 ) cycle
|
||||
|
||||
! normalize the softsymbols before submitting to decoder
|
||||
sav=sum(softbits)/144
|
||||
s2av=sum(softbits*softbits)/144
|
||||
ssig=sqrt(s2av-sav*sav)
|
||||
softbits=softbits/ssig
|
||||
|
||||
sigma=0.75
|
||||
lratio(1:48)=softbits(9:9+47)
|
||||
lratio(49:128)=softbits(65:65+80-1)
|
||||
llr=2.0*lratio/(sigma*sigma)
|
||||
lratio=exp(2.0*lratio/(sigma*sigma))
|
||||
|
||||
max_iterations=10
|
||||
max_dither=1
|
||||
call timer('bpdec144 ',0)
|
||||
call bpdecode144(llr,max_iterations,decoded,niterations)
|
||||
call timer('bpdec144 ',1)
|
||||
|
||||
if( niterations .ge. 0.0 ) then
|
||||
call extractmessage144(decoded,msgreceived,nhashflag)
|
||||
if( nhashflag .gt. 0 ) then ! CRCs match, so print it
|
||||
ndupe=0
|
||||
do im=1,nmessages
|
||||
if( allmessages(im) .eq. msgreceived ) ndupe=1
|
||||
enddo
|
||||
if( ndupe .eq. 0 ) then
|
||||
nmessages=nmessages+1
|
||||
allmessages(nmessages)=msgreceived
|
||||
write(lines(nmessages),1020) nutc,nsnr,t0,nint(fest),msgreceived
|
||||
1020 format(i6.6,i4,f5.1,i5,' & ',a22)
|
||||
endif
|
||||
goto 999
|
||||
else
|
||||
msgreceived=' '
|
||||
ndither=-99 ! -99 is bad hash flag
|
||||
! write(78,1001) nutc,t0,nsnr,ip,ipk,is,idf,iav,ipha,deltaf,fest,ferr,ferr2, &
|
||||
! ffin,bba,bbp,nbadsync1,nbadsync2, &
|
||||
! phase0,niterations,ndither,msgreceived
|
||||
endif
|
||||
endif
|
||||
enddo ! phase dither
|
||||
enddo ! frame averaging loop
|
||||
enddo ! frequency dithering loop
|
||||
enddo ! sample-time dither loop
|
||||
enddo ! peak loop - could be made more efficient by working harder to find good peaks
|
||||
|
||||
msgreceived=' '
|
||||
ndither=-98
|
||||
999 continue
|
||||
if( nmessages .ge. 1 ) then
|
||||
! write(78,1001) nutc,t0,nsnr,ip,ipk,is,idf,iav,ipha,deltaf,fest,ferr,ferr2, &
|
||||
! ffin,bba,bbp,nbadsync1,nbadsync2, &
|
||||
! phase0,niterations,ndither,msgreceived
|
||||
! call flush(78)
|
||||
!1001 format(i6.6,f8.2,i5,i5,i5,i5,i5,i5,i5,f6.2,f8.2,f8.2,f8.2,f8.2,f11.1,f8.2,i5,i5,f8.2,i5,i5,2x,a22)
|
||||
exit
|
||||
endif
|
||||
enddo
|
||||
return
|
||||
end subroutine detectmsk144
|
||||
@ -1,425 +0,0 @@
|
||||
subroutine detectmsk40(cbig,n,mycall,hiscall,lines,nmessages, &
|
||||
nutc,ntol,t00)
|
||||
|
||||
use timer_module, only: timer
|
||||
parameter (NSPM=240, NPTS=3*NSPM, MAXSTEPS=7500, NFFT=3*NSPM, MAXCAND=15)
|
||||
character*4 rpt(0:15)
|
||||
character*6 mycall,hiscall,mycall0,hiscall0
|
||||
character*22 hashmsg,msgreceived
|
||||
character*80 lines(100)
|
||||
complex cbig(n)
|
||||
complex cdat(NPTS) !Analytic signal
|
||||
complex cdat2(NPTS)
|
||||
complex c(NSPM)
|
||||
complex ctmp(NFFT)
|
||||
complex cb(42) !Complex waveform for sync word
|
||||
complex cbr(42) !Complex waveform for reversed sync word
|
||||
complex cfac,cca,ccb
|
||||
complex ccr(NPTS)
|
||||
complex ccr1(NPTS)
|
||||
complex ccr2(NPTS)
|
||||
complex bb(6)
|
||||
integer s8(8),s8r(8),hardbits(40)
|
||||
integer, dimension(1) :: iloc
|
||||
! integer nhashes(0:15)
|
||||
integer indices(MAXSTEPS)
|
||||
integer ipeaks(10)
|
||||
integer*1 cw(32)
|
||||
integer*1 decoded(16)
|
||||
integer*1 testcw(32)
|
||||
logical ismask(NFFT)
|
||||
real cbi(42),cbq(42)
|
||||
real detmet(-2:MAXSTEPS+3)
|
||||
real detmet2(-2:MAXSTEPS+3)
|
||||
real detfer(MAXSTEPS)
|
||||
real rcw(12)
|
||||
real ddr(NPTS)
|
||||
real ferrs(MAXCAND)
|
||||
real llr(32)
|
||||
real pp(12) !Half-sine pulse shape
|
||||
real snrs(MAXCAND)
|
||||
real softbits(40)
|
||||
real times(MAXCAND)
|
||||
real tonespec(NFFT)
|
||||
real*8 dt, df, fs, pi, twopi
|
||||
real*8 lratio(32)
|
||||
logical first
|
||||
data first/.true./
|
||||
data mycall0/'dummy'/,hiscall0/'dummy'/
|
||||
data rpt/"-03 ","+00 ","+03 ","+06 ","+10 ","+13 ","+16 ", &
|
||||
"R-03","R+00","R+03","R+06","R+10","R+13","R+16", &
|
||||
"RRR ","73 "/
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
data s8r/1,0,1,1,0,0,0,1/
|
||||
! codeword for the message <K9AN K1JT> RRR
|
||||
data testcw/0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,1,0,1,1,1,1,1,0,0,0,0,0,0,1,1,1,0/
|
||||
save df,first,cb,cbr,fs,pi,twopi,dt,s8,s8r,rcw,pp,nmatchedfilter,rpt,mycall0,hiscall0,ihash
|
||||
|
||||
if(first) then
|
||||
nmatchedfilter=1
|
||||
! define half-sine pulse and raised-cosine edge window
|
||||
pi=4d0*datan(1d0)
|
||||
twopi=8d0*datan(1d0)
|
||||
fs=12000.0
|
||||
dt=1.0/fs
|
||||
df=fs/NFFT
|
||||
|
||||
do i=1,12
|
||||
angle=(i-1)*pi/12.0
|
||||
pp(i)=sin(angle)
|
||||
rcw(i)=(1-cos(angle))/2
|
||||
enddo
|
||||
|
||||
! define the sync word waveforms
|
||||
s8=2*s8-1
|
||||
cbq(1:6)=pp(7:12)*s8(1)
|
||||
cbq(7:18)=pp*s8(3)
|
||||
cbq(19:30)=pp*s8(5)
|
||||
cbq(31:42)=pp*s8(7)
|
||||
cbi(1:12)=pp*s8(2)
|
||||
cbi(13:24)=pp*s8(4)
|
||||
cbi(25:36)=pp*s8(6)
|
||||
cbi(37:42)=pp(1:6)*s8(8)
|
||||
cb=cmplx(cbi,cbq)
|
||||
s8r=2*s8r-1
|
||||
cbq(1:6)=pp(7:12)*s8r(1)
|
||||
cbq(7:18)=pp*s8r(3)
|
||||
cbq(19:30)=pp*s8r(5)
|
||||
cbq(31:42)=pp*s8r(7)
|
||||
cbi(1:12)=pp*s8r(2)
|
||||
cbi(13:24)=pp*s8r(4)
|
||||
cbi(25:36)=pp*s8r(6)
|
||||
cbi(37:42)=pp(1:6)*s8r(8)
|
||||
cbr=cmplx(cbi,cbq)
|
||||
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
if(mycall.ne.mycall0 .or. hiscall.ne.hiscall0) then
|
||||
! do i=0,15
|
||||
! hashmsg=trim(mycall)//' '//trim(hiscall)//' '//rpt(i)
|
||||
hashmsg=trim(mycall)//' '//trim(hiscall)
|
||||
call fmtmsg(hashmsg,iz)
|
||||
call hash(hashmsg,22,ihash)
|
||||
! nhashes(i)=iand(ihash,4095)
|
||||
ihash=iand(ihash,4095)
|
||||
! enddo
|
||||
mycall0=mycall
|
||||
hiscall0=hiscall
|
||||
endif
|
||||
|
||||
! Fill the detmet, detferr arrays
|
||||
nstepsize=60 ! 5ms steps
|
||||
nstep=(n-NPTS)/nstepsize
|
||||
detmet=0
|
||||
detmet2=0
|
||||
detfer=-999.99
|
||||
do istp=1,nstep
|
||||
ns=1+nstepsize*(istp-1)
|
||||
ne=ns+NPTS-1
|
||||
if( ne .gt. n ) exit
|
||||
ctmp=cmplx(0.0,0.0)
|
||||
ctmp(1:NPTS)=cbig(ns:ne)
|
||||
|
||||
! Coarse carrier frequency sync - seek tones at 2000 Hz and 4000 Hz in
|
||||
! squared signal spectrum.
|
||||
! search range for coarse frequency error is +/- 100 Hz
|
||||
|
||||
ctmp=ctmp**2
|
||||
ctmp(1:12)=ctmp(1:12)*rcw
|
||||
ctmp(NPTS-11:NPTS)=ctmp(NPTS-11:NPTS)*rcw(12:1:-1)
|
||||
call four2a(ctmp,NFFT,1,-1,1)
|
||||
tonespec=abs(ctmp)**2
|
||||
|
||||
ihlo=(4000-2*ntol)/df+1
|
||||
ihhi=(4000+2*ntol)/df+1
|
||||
ismask=.false.
|
||||
ismask(ihlo:ihhi)=.true. ! high tone search window
|
||||
iloc=maxloc(tonespec,ismask)
|
||||
ihpk=iloc(1)
|
||||
deltah=-real( (ctmp(ihpk-1)-ctmp(ihpk+1)) / (2*ctmp(ihpk)-ctmp(ihpk-1)-ctmp(ihpk+1)) )
|
||||
ah=tonespec(ihpk)
|
||||
ahavp=(sum(tonespec,ismask)-ah)/count(ismask)
|
||||
trath=ah/(ahavp+0.01)
|
||||
illo=(2000-2*ntol)/df+1
|
||||
ilhi=(2000+2*ntol)/df+1
|
||||
ismask=.false.
|
||||
ismask(illo:ilhi)=.true. ! window for low tone
|
||||
iloc=maxloc(tonespec,ismask)
|
||||
ilpk=iloc(1)
|
||||
deltal=-real( (ctmp(ilpk-1)-ctmp(ilpk+1)) / (2*ctmp(ilpk)-ctmp(ilpk-1)-ctmp(ilpk+1)) )
|
||||
al=tonespec(ilpk)
|
||||
alavp=(sum(tonespec,ismask)-al)/count(ismask)
|
||||
tratl=al/(alavp+0.01)
|
||||
fdiff=(ihpk+deltah-ilpk-deltal)*df
|
||||
i2000=nint(2000/df)+1
|
||||
i4000=nint(4000/df)+1
|
||||
ferrh=(ihpk+deltah-i4000)*df/2.0
|
||||
ferrl=(ilpk+deltal-i2000)*df/2.0
|
||||
if( ah .ge. al ) then
|
||||
ferr=ferrh
|
||||
else
|
||||
ferr=ferrl
|
||||
endif
|
||||
detmet(istp)=max(ah,al)
|
||||
detmet2(istp)=max(trath,tratl)
|
||||
detfer(istp)=ferr
|
||||
! write(*,*) istp,ilpk,ihpk,ah,al
|
||||
enddo ! end of detection-metric and frequency error estimation loop
|
||||
|
||||
call indexx(detmet(1:nstep),nstep,indices) !find median of detection metric vector
|
||||
xmed=detmet(indices(nstep/4))
|
||||
detmet=detmet/xmed ! noise floor of detection metric is 1.0
|
||||
ndet=0
|
||||
|
||||
!do i=1,nstep
|
||||
!write(77,*) i,detmet(i),detmet2(i),detfer(i)
|
||||
!enddo
|
||||
|
||||
do ip=1,MAXCAND ! find candidates
|
||||
iloc=maxloc(detmet(1:nstep))
|
||||
il=iloc(1)
|
||||
if( (detmet(il) .lt. 4.2) ) exit
|
||||
if( abs(detfer(il)) .le. ntol ) then
|
||||
ndet=ndet+1
|
||||
times(ndet)=((il-1)*nstepsize+NPTS/2)*dt
|
||||
ferrs(ndet)=detfer(il)
|
||||
snrs(ndet)=12.0*log10(detmet(il)-1)/2-8.0
|
||||
endif
|
||||
detmet(max(1,il-3):min(nstep,il+3))=0.0
|
||||
! detmet(il)=0.0
|
||||
enddo
|
||||
|
||||
if( ndet .lt. 3 ) then
|
||||
do ip=1,MAXCAND-ndet ! Find candidates
|
||||
iloc=maxloc(detmet2(1:nstep))
|
||||
il=iloc(1)
|
||||
if( (detmet2(il) .lt. 20.0) ) exit
|
||||
if( abs(detfer(il)) .le. ntol ) then
|
||||
ndet=ndet+1
|
||||
times(ndet)=((il-1)*nstepsize+NSPM/2)*dt
|
||||
ferrs(ndet)=detfer(il)
|
||||
snrs(ndet)=12.0*log10(detmet2(il))/2-9.0
|
||||
endif
|
||||
detmet2(max(1,il-1):min(nstep,il+1))=0.0
|
||||
! detmet2(il)=0.0
|
||||
enddo
|
||||
endif
|
||||
|
||||
! do ip=1,ndet
|
||||
! write(*,'(i5,f7.2,f7.2,f7.2)') ip,times(ip),snrs(ip),ferrs(ip)
|
||||
! enddo
|
||||
|
||||
nmessages=0
|
||||
lines=char(0)
|
||||
|
||||
ncalls=0
|
||||
do ip=1,ndet !run through the candidates and try to sync/demod/decode
|
||||
imid=times(ip)*fs
|
||||
if( imid .lt. NPTS/2 ) imid=NPTS/2
|
||||
if( imid .gt. n-NPTS/2 ) imid=n-NPTS/2
|
||||
t0=times(ip) + t00
|
||||
cdat=cbig(imid-NPTS/2+1:imid+NPTS/2)
|
||||
ferr=ferrs(ip)
|
||||
xsnr=snrs(ip)
|
||||
nsnr=nint(snrs(ip))
|
||||
if( nsnr .lt. -5 ) nsnr=-5
|
||||
if( nsnr .gt. 25 ) nsnr=25
|
||||
|
||||
! remove coarse freq error
|
||||
call tweak1(cdat,NPTS,-(1500+ferr),cdat)
|
||||
|
||||
! attempt frame synchronization
|
||||
! correlate with sync word waveforms
|
||||
ccr=0
|
||||
ccr1=0
|
||||
ccr2=0
|
||||
do i=1,NPTS-(40*6+41)
|
||||
ccr1(i)=sum(cdat(i:i+41)*conjg(cbr))
|
||||
ccr2(i)=sum(cdat(i+40*6:i+40*6+41)*conjg(cbr))
|
||||
enddo
|
||||
ccr=ccr1+ccr2
|
||||
ddr=abs(ccr1)*abs(ccr2)
|
||||
crmax=maxval(abs(ccr))
|
||||
|
||||
!do i=1,NPTS
|
||||
!write(15,*) i,abs(ccr(i)),ddr(i),abs(cdat(i))
|
||||
!enddo
|
||||
|
||||
|
||||
! Find 6 largest peaks
|
||||
do ipk=1,6
|
||||
iloc=maxloc(ddr)
|
||||
ic1=iloc(1)
|
||||
ipeaks(ipk)=ic1
|
||||
ddr(max(1,ic1-7):min(NPTS-40*6-41,ic1+7))=0.0
|
||||
enddo
|
||||
!do i=1,6
|
||||
!write(*,*) i,ipeaks(i)
|
||||
!enddo
|
||||
do ipk=1,4
|
||||
|
||||
! we want ic to be the index of the first sample of the frame
|
||||
ic0=ipeaks(ipk)
|
||||
|
||||
! fine adjustment of sync index
|
||||
do i=1,6
|
||||
if( ic0+11+NSPM .le. NPTS ) then
|
||||
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 )
|
||||
else
|
||||
bb(i) = sum( ( cdat(ic0+i-1+6:NPTS:6) * conjg( cdat(ic0+i-1:NPTS-6:6) ) )**2 )
|
||||
endif
|
||||
enddo
|
||||
iloc=maxloc(abs(bb))
|
||||
ibb=iloc(1)
|
||||
bba=abs(bb(ibb))
|
||||
bbp=atan2(-imag(bb(ibb)),-real(bb(ibb)))/(2*twopi*6*dt)
|
||||
!write(*,*) abs(bb),bbp
|
||||
if( ibb .le. 3 ) ibb=ibb-1
|
||||
if( ibb .gt. 3 ) ibb=ibb-7
|
||||
|
||||
do id=1,3 ! slicer dither.
|
||||
if( id .eq. 1 ) is=0
|
||||
if( id .eq. 2 ) is=-1
|
||||
if( id .eq. 3 ) is=1
|
||||
|
||||
! Adjust frame index to place peak of bb at desired lag
|
||||
ic=ic0+ibb+is
|
||||
if( ic .lt. 1 ) ic=ic+NSPM
|
||||
|
||||
! Estimate fine frequency error.
|
||||
cca=sum(cdat(ic:ic+41)*conjg(cbr))
|
||||
if( ic+40*6+41 .le. NPTS ) then
|
||||
ccb=sum(cdat(ic+40*6:ic+40*6+41)*conjg(cbr))
|
||||
cfac=ccb*conjg(cca)
|
||||
ferr2=atan2(imag(cfac),real(cfac))/(twopi*40*6*dt)
|
||||
else
|
||||
ccb=sum(cdat(ic-40*6:ic-40*6+41)*conjg(cbr))
|
||||
cfac=cca*conjg(ccb)
|
||||
ferr2=atan2(imag(cfac),real(cfac))/(twopi*40*6*dt)
|
||||
endif
|
||||
|
||||
do idf=0,2 ! frequency jitter
|
||||
if( idf .eq. 0 ) then
|
||||
deltaf=0.0
|
||||
elseif( mod(idf,2) .eq. 0 ) then
|
||||
deltaf=2.5*idf
|
||||
else
|
||||
deltaf=-2.5*(idf+1)
|
||||
endif
|
||||
|
||||
! Remove fine frequency error
|
||||
call tweak1(cdat,NPTS,-(ferr2+deltaf),cdat2)
|
||||
|
||||
! place the beginning of frame at index NSPM+1
|
||||
cdat2=cshift(cdat2,ic-(NSPM+1))
|
||||
|
||||
do iav=1,4 ! Frame averaging patterns
|
||||
if( iav .eq. 1 ) then
|
||||
c=cdat2(NSPM+1:2*NSPM)
|
||||
elseif( iav .eq. 2 ) then
|
||||
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
|
||||
elseif( iav .eq. 3 ) then
|
||||
c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:3*NSPM)
|
||||
elseif( iav .eq. 4 ) then
|
||||
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:3*NSPM)
|
||||
endif
|
||||
|
||||
! Estimate final frequency error and carrier phase.
|
||||
cca=sum(c(1:1+41)*conjg(cbr))
|
||||
phase0=atan2(imag(cca),real(cca))
|
||||
|
||||
do ipha=1,3
|
||||
if( ipha.eq.2 ) phase0=phase0-30*pi/180.0
|
||||
if( ipha.eq.3 ) phase0=phase0+30*pi/180.0
|
||||
|
||||
! Remove phase error - want constellation rotated so that sample points lie on I/Q axes
|
||||
cfac=cmplx(cos(phase0),sin(phase0))
|
||||
c=c*conjg(cfac)
|
||||
|
||||
if( nmatchedfilter .eq. 0 ) then
|
||||
do i=1, 20
|
||||
softbits(2*i-1)=imag(c(1+(i-1)*12))
|
||||
softbits(2*i)=real(c(7+(i-1)*12))
|
||||
enddo
|
||||
else ! matched filter
|
||||
softbits(1)=sum(imag(c(1:6))*pp(7:12))+sum(imag(c(NSPM-5:NSPM))*pp(1:6))
|
||||
softbits(2)=sum(real(c(1:12))*pp)
|
||||
do i=2,20
|
||||
softbits(2*i-1)=sum(imag(c(1+(i-1)*12-6:1+(i-1)*12+5))*pp)
|
||||
softbits(2*i)=sum(real(c(7+(i-1)*12-6:7+(i-1)*12+5))*pp)
|
||||
enddo
|
||||
endif
|
||||
|
||||
hardbits=0 ! use sync word hard error weight to decide whether to send to decoder
|
||||
do i=1, 40
|
||||
if( softbits(i) .ge. 0.0 ) then
|
||||
hardbits(i)=1
|
||||
endif
|
||||
enddo
|
||||
nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8r ) )/2
|
||||
nbadsync=nbadsync1
|
||||
if( nbadsync .gt. 3 ) cycle
|
||||
! nerr=0
|
||||
! do i=1,32
|
||||
! if( testcw(i) .ne. hardbits(i+8) ) nerr=nerr+1
|
||||
! enddo
|
||||
! normalize the softsymbols before submitting to decoder
|
||||
sav=sum(softbits)/40
|
||||
s2av=sum(softbits*softbits)/40
|
||||
ssig=sqrt(s2av-sav*sav)
|
||||
softbits=softbits/ssig
|
||||
|
||||
sigma=0.75
|
||||
if(xsnr.lt.0.0) sigma=0.75-0.0875*xsnr
|
||||
lratio(1:32)=exp(2.0*softbits(9:40)/(sigma*sigma)) ! Use this for Radford Neal's routines
|
||||
llr(1:32)=2.0*softbits(9:40)/(sigma*sigma) ! Use log likelihood for bpdecode40
|
||||
|
||||
max_iterations=5
|
||||
max_dither=1
|
||||
call bpdecode40(llr,max_iterations, decoded, niterations)
|
||||
ncalls=ncalls+1
|
||||
|
||||
nhashflag=0
|
||||
if( niterations .ge. 0 ) then
|
||||
call encode_msk40(decoded,cw)
|
||||
! call ldpc_encode(decoded,cw)
|
||||
nhammd=0
|
||||
cord=0.0
|
||||
do i=1,32
|
||||
if( cw(i) .ne. hardbits(i+8) ) then
|
||||
nhammd=nhammd+1
|
||||
cord=cord+abs(softbits(i+8))
|
||||
endif
|
||||
enddo
|
||||
|
||||
imsg=0
|
||||
do i=1,16
|
||||
imsg=ishft(imsg,1)+iand(1,decoded(17-i))
|
||||
enddo
|
||||
nrxrpt=iand(imsg,15)
|
||||
nrxhash=(imsg-nrxrpt)/16
|
||||
! if( nhammd .le. 5 .and. cord .lt. 1.7 .and. nrxhash .eq. nhashes(nrxrpt) ) then
|
||||
if( nhammd .le. 5 .and. cord .lt. 1.7 .and. nrxhash .eq. ihash ) then
|
||||
fest=1500+ferr+ferr2+deltaf
|
||||
!write(14,'(i6.6,11i6,f7.1,f7.1)') nutc,ip,ipk,id,idf,iav,ipha,niterations,nbadsync,nrxrpt,ncalls,nhammd,cord,xsnr
|
||||
nhashflag=1
|
||||
msgreceived=' '
|
||||
nmessages=1
|
||||
write(msgreceived,'(a1,a,1x,a,a1,1x,a4)') "<",trim(mycall), &
|
||||
trim(hiscall),">",rpt(nrxrpt)
|
||||
write(lines(nmessages),1020) nutc,nsnr,t0,nint(fest),msgreceived
|
||||
1020 format(i6.6,i4,f5.1,i5,' & ',a22)
|
||||
return
|
||||
endif
|
||||
|
||||
endif
|
||||
|
||||
enddo ! phase loop
|
||||
enddo ! frame averaging loop
|
||||
enddo ! frequency dithering loop
|
||||
enddo ! slicer dither loop
|
||||
enddo ! time-sync correlation-peak loop
|
||||
enddo ! candidate loop
|
||||
return
|
||||
end subroutine detectmsk40
|
||||
@ -1,4 +1,4 @@
|
||||
subroutine fast_decode(id2,narg,ntrperiod,bShMsgs,line,mycall_12, &
|
||||
subroutine fast_decode(id2,narg,ntrperiod,line,mycall_12, &
|
||||
hiscall_12)
|
||||
|
||||
parameter (NMAX=30*12000)
|
||||
@ -6,7 +6,6 @@ subroutine fast_decode(id2,narg,ntrperiod,bShMsgs,line,mycall_12, &
|
||||
integer*2 id2a(NMAX)
|
||||
integer*2 id2b(NMAX)
|
||||
integer narg(0:14)
|
||||
logical*1 bShMsgs
|
||||
real dat(30*12000)
|
||||
complex cdat(262145),cdat2(262145)
|
||||
real psavg(450)
|
||||
@ -48,42 +47,6 @@ subroutine fast_decode(id2,narg,ntrperiod,bShMsgs,line,mycall_12, &
|
||||
if(nmode.eq.102) then
|
||||
call fast9(id2,narg,line)
|
||||
go to 900
|
||||
else if(nmode.eq.104) then
|
||||
! MSK144 mode
|
||||
if(newdat.eq.1) then
|
||||
id2b=id2a !Data for lower panel
|
||||
id2a=id2 !Data for upper panel
|
||||
nutcb=nutca
|
||||
nutca=nutc
|
||||
endif
|
||||
ia=max(1,nint(t0*12000.0))
|
||||
ib=nint(t1*12000.0)
|
||||
if(ib.gt.ntrperiod*12000) ib=ntrperiod*12000
|
||||
nz=ib-ia+1
|
||||
|
||||
if(newdat.eq.1) then
|
||||
! Full sequence of new data
|
||||
call msk144_decode(id2a(ia),nz,nutca,0,mycall,hiscall, &
|
||||
bShMsgs,ntol,t0,line)
|
||||
go to 100
|
||||
endif
|
||||
|
||||
if(npick.eq.1) then
|
||||
! Pick-decode from upper panel
|
||||
call msk144_decode(id2(ia),nz,nutc,0,mycall,hiscall, &
|
||||
bShMsgs,ntol,t0,line)
|
||||
go to 100
|
||||
endif
|
||||
|
||||
if(npick.eq.2) then
|
||||
! Pick-decode from lower panel
|
||||
! write(*,3001) newdat,npick,nutca
|
||||
call msk144_decode(id2b(ia),nz,nutca,0,mycall,hiscall, &
|
||||
bShMsgs,ntol,t0,line)
|
||||
endif
|
||||
100 continue
|
||||
go to 900
|
||||
|
||||
endif
|
||||
|
||||
if(newdat.eq.1) then
|
||||
|
||||
@ -1,97 +0,0 @@
|
||||
program msk144d
|
||||
|
||||
! Test the msk144 decoder for WSJT-X
|
||||
|
||||
use options
|
||||
use timer_module, only: timer
|
||||
use timer_impl, only: init_timer
|
||||
use readwav
|
||||
|
||||
character c
|
||||
character*80 line(100)
|
||||
character*512 pchk_file
|
||||
logical :: display_help=.false.
|
||||
logical*1 bShMsgs
|
||||
type(wav_header) :: wav
|
||||
integer*2 id2(30*12000)
|
||||
character*500 infile
|
||||
character*12 mycall,hiscall
|
||||
character(len=500) optarg
|
||||
|
||||
type (option) :: long_options(6) = [ &
|
||||
option ('dxcall',.true.,'d','hiscall',''), &
|
||||
option ('evemode',.true.,'e','',''), &
|
||||
option ('help',.false.,'h','Display this help message',''), &
|
||||
option ('mycall',.true.,'m','mycall',''), &
|
||||
option ('nftol',.true.,'n','nftol',''), &
|
||||
option ('short',.false.,'s','enable Sh','') &
|
||||
]
|
||||
t0=0.0
|
||||
ntol=100
|
||||
mycall=''
|
||||
hiscall=''
|
||||
bShMsgs=.false.
|
||||
|
||||
do
|
||||
call getopt('d:ehm:n:s',long_options,c,optarg,narglen,nstat,noffset,nremain,.true.)
|
||||
if( nstat .ne. 0 ) then
|
||||
exit
|
||||
end if
|
||||
select case (c)
|
||||
case ('d')
|
||||
read (optarg(:narglen), *) hiscall
|
||||
case ('e')
|
||||
t0=1e-4
|
||||
case ('h')
|
||||
display_help = .true.
|
||||
case ('m')
|
||||
read (optarg(:narglen), *) mycall
|
||||
case ('n')
|
||||
read (optarg(:narglen), *) ntol
|
||||
case ('s')
|
||||
bShMsgs=.true.
|
||||
end select
|
||||
end do
|
||||
|
||||
if(display_help .or. nstat.lt.0 .or. nremain.lt.1) then
|
||||
print *, ''
|
||||
print *, 'Usage: msk144d [OPTIONS] file1 [file2 ...]'
|
||||
print *, ''
|
||||
print *, ' msk144 decode pre-recorded .WAV file(s)'
|
||||
print *, ''
|
||||
print *, 'OPTIONS:'
|
||||
do i = 1, size (long_options)
|
||||
call long_options(i) % print (6)
|
||||
end do
|
||||
go to 999
|
||||
endif
|
||||
|
||||
call init_timer ('timer.out')
|
||||
call timer('msk144 ',0)
|
||||
pchk_file='./peg-128-80-reg3.pchk'
|
||||
ndecoded=0
|
||||
do ifile=noffset+1,noffset+nremain
|
||||
call get_command_argument(ifile,optarg,narglen)
|
||||
infile=optarg(:narglen)
|
||||
call timer('read ',0)
|
||||
call wav%read (infile)
|
||||
i1=index(infile,'.wav')
|
||||
if( i1 .eq. 0 ) i1=index(infile,'.WAV')
|
||||
read(infile(i1-6:i1-1),*,err=998) nutc
|
||||
inquire(FILE=infile,SIZE=isize)
|
||||
npts=min((isize-216)/2,360000)
|
||||
read(unit=wav%lun) id2(1:npts)
|
||||
close(unit=wav%lun)
|
||||
call timer('read ',1)
|
||||
call msk144_decode(id2,npts,nutc,1,mycall,hiscall,bShMsgs,ntol,t0,line)
|
||||
enddo
|
||||
|
||||
call timer('msk144 ',1)
|
||||
call timer('msk144 ',101)
|
||||
go to 999
|
||||
|
||||
998 print*,'Cannot read from file:'
|
||||
print*,infile
|
||||
|
||||
999 continue
|
||||
end program msk144d
|
||||
@ -1,225 +0,0 @@
|
||||
subroutine opdetmsk144(cbig,n,lines,nmessages,nutc,ntol,t00)
|
||||
use timer_module, only: timer
|
||||
! NSPM: number of samples per message frame
|
||||
! NAVG: number of frames to coherently average
|
||||
parameter (NSPM=864, NAVG=7, NPTS=NAVG*NSPM, NSTEP=6000)
|
||||
character*22 msgreceived,allmessages(20)
|
||||
character*80 lines(100)
|
||||
complex cbig(n)
|
||||
complex cdat(NPTS) !Analytic signal
|
||||
complex cdat2(NPTS)
|
||||
complex c(NSPM)
|
||||
complex cr(NSPM,NAVG)
|
||||
complex ct(NSPM)
|
||||
complex cs(NSPM)
|
||||
complex cb(42) !Complex waveform for sync word
|
||||
complex cfac,cca,ccb
|
||||
complex cc(0:NSPM-1)
|
||||
complex csum
|
||||
integer s8(8),hardbits(144)
|
||||
integer, dimension(1) :: iloc
|
||||
integer*1 decoded(80)
|
||||
integer ipeaks(10)
|
||||
real cbi(42),cbq(42)
|
||||
real rcw(12)
|
||||
real ccm(0:NSPM-1)
|
||||
real ccms(0:NSPM-1)
|
||||
real pp(12) !Half-sine pulse shape
|
||||
real*8 dt, fs, pi, twopi
|
||||
real softbits(144)
|
||||
real*8 lratio(128)
|
||||
real llr(128)
|
||||
logical first
|
||||
data first/.true./
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
save first,cb,fs,pi,twopi,dt,s8,rcw,pp,nmatchedfilter
|
||||
|
||||
if(first) then
|
||||
nmatchedfilter=1
|
||||
! define half-sine pulse and raised-cosine edge window
|
||||
pi=4d0*datan(1d0)
|
||||
twopi=8d0*datan(1d0)
|
||||
fs=12000.0
|
||||
dt=1.0/fs
|
||||
|
||||
do i=1,12
|
||||
angle=(i-1)*pi/12.0
|
||||
pp(i)=sin(angle)
|
||||
rcw(i)=(1-cos(angle))/2
|
||||
enddo
|
||||
|
||||
! define the sync word waveforms
|
||||
s8=2*s8-1
|
||||
cbq(1:6)=pp(7:12)*s8(1)
|
||||
cbq(7:18)=pp*s8(3)
|
||||
cbq(19:30)=pp*s8(5)
|
||||
cbq(31:42)=pp*s8(7)
|
||||
cbi(1:12)=pp*s8(2)
|
||||
cbi(13:24)=pp*s8(4)
|
||||
cbi(25:36)=pp*s8(6)
|
||||
cbi(37:42)=pp(1:6)*s8(8)
|
||||
cb=cmplx(cbi,cbq)
|
||||
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
nmessages=0
|
||||
allmessages=char(0)
|
||||
lines=char(0)
|
||||
nshort=0
|
||||
trec=NPTS/12000.0 ! Duration of the data record
|
||||
! write(*,*) "number of points in opdetmsk144",n
|
||||
if( n .lt. NPTS .or. n .gt. 181000) return
|
||||
nsteps=2*n/NSTEP-1 ! Hardwired for 0.5s steps
|
||||
! write(*,*) 'nsteps ',nsteps
|
||||
nsnr=-4
|
||||
|
||||
do istep=1,nsteps
|
||||
ib=(istep-1)*NPTS/2+1
|
||||
ie=ib+NPTS-1
|
||||
if( ie .gt. n ) then
|
||||
ie=n
|
||||
ib=n-NPTS+1
|
||||
endif
|
||||
t0=t00+(ib-1)/12000.0+trec/2
|
||||
cdat=cbig(ib:ie)
|
||||
|
||||
xmax=0.0
|
||||
bestf=0.0
|
||||
do ifr=-ntol,ntol ! search for frequency that maximizes sync correlation
|
||||
ferr=ifr
|
||||
! call timer('opdetavg ',0)
|
||||
call tweak1(cdat,NPTS,-(1500+ferr),cdat2)
|
||||
cr=reshape(cdat2,(/NSPM,NAVG/))
|
||||
c=sum(cr,2)
|
||||
! call timer('opdetavg ',1)
|
||||
|
||||
! call timer('opdetsync',0)
|
||||
cc=0
|
||||
do ish=0,NSPM-1
|
||||
ct=cshift(c,ish)
|
||||
! cc(ish)=sum(ct(1:42)*conjg(cb))+sum(ct(56*6:56*6+41)*conjg(cb))
|
||||
! cc(ish)=sum(ct(1:42)*conjg(cb)+ ct(56*6:56*6+41)*conjg(cb))
|
||||
csum=0
|
||||
do j=1,42
|
||||
csum=csum+(ct(j)+ct(56*6+j-1))*conjg(cb(j))
|
||||
enddo
|
||||
cc(ish)=csum
|
||||
enddo
|
||||
ccm=abs(cc)
|
||||
xb=maxval(ccm)
|
||||
! call timer('opdetsync',1)
|
||||
if( xb .gt. xmax ) then
|
||||
xmax=xb
|
||||
bestf=ferr
|
||||
cs=c
|
||||
ccms=ccm
|
||||
endif
|
||||
enddo
|
||||
|
||||
fest=1500+bestf
|
||||
! write(*,*) istep,fest,xmax
|
||||
c=cs
|
||||
ccm=ccms
|
||||
|
||||
! Find 2 largest peaks
|
||||
do ipk=1, 2
|
||||
iloc=maxloc(ccm)
|
||||
ic2=iloc(1)
|
||||
ipeaks(ipk)=ic2
|
||||
ccm(max(0,ic2-7):min(NSPM-1,ic2+7))=0.0
|
||||
enddo
|
||||
|
||||
do ipk=1,2
|
||||
do is=1,3
|
||||
|
||||
ic0=ipeaks(ipk)
|
||||
if( is.eq.2 ) ic0=max(1,ic0-1)
|
||||
if( is.eq.3 ) ic0=min(NSPM,ic0+1)
|
||||
ct=cshift(c,ic0-1)
|
||||
|
||||
! Estimate final frequency error and carrier phase.
|
||||
cca=sum(ct(1:1+41)*conjg(cb))
|
||||
ccb=sum(ct(1+56*6:1+56*6+41)*conjg(cb))
|
||||
cfac=ccb*conjg(cca)
|
||||
ffin=atan2(imag(cfac),real(cfac))/(twopi*56*6*dt)
|
||||
phase0=atan2(imag(cca+ccb),real(cca+ccb))
|
||||
|
||||
! Remove phase error - want constellation rotated so that sample points lie on I/Q axes
|
||||
cfac=cmplx(cos(phase0),sin(phase0))
|
||||
ct=ct*conjg(cfac)
|
||||
|
||||
if( nmatchedfilter .eq. 0 ) then
|
||||
! sample to get softsamples
|
||||
do i=1,72
|
||||
softbits(2*i-1)=imag(c(1+(i-1)*12))
|
||||
softbits(2*i)=real(c(7+(i-1)*12))
|
||||
enddo
|
||||
else
|
||||
! matched filter -
|
||||
softbits(1)=sum(imag(ct(1:6))*pp(7:12))+sum(imag(ct(864-5:864))*pp(1:6))
|
||||
softbits(2)=sum(real(ct(1:12))*pp)
|
||||
do i=2,72
|
||||
softbits(2*i-1)=sum(imag(ct(1+(i-1)*12-6:1+(i-1)*12+5))*pp)
|
||||
softbits(2*i)=sum(real(ct(7+(i-1)*12-6:7+(i-1)*12+5))*pp)
|
||||
enddo
|
||||
endif
|
||||
|
||||
! sync word hard error weight is a good discriminator for
|
||||
! frames that have reasonable probability of decoding
|
||||
hardbits=0
|
||||
do i=1,144
|
||||
if( softbits(i) .ge. 0.0 ) then
|
||||
hardbits(i)=1
|
||||
endif
|
||||
enddo
|
||||
nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8 ) )/2
|
||||
nbadsync2=(8-sum( (2*hardbits(1+56:8+56)-1)*s8 ) )/2
|
||||
nbadsync=nbadsync1+nbadsync2
|
||||
!write(*,*) 'peak index ',ipk,' pk loc: ',ic0,' nbadsync ',nbadsync
|
||||
if( nbadsync .gt. 4 ) cycle
|
||||
|
||||
! normalize the softsymbols before submitting to decoder
|
||||
sav=sum(softbits)/144
|
||||
s2av=sum(softbits*softbits)/144
|
||||
ssig=sqrt(s2av-sav*sav)
|
||||
softbits=softbits/ssig
|
||||
|
||||
sigma=0.75
|
||||
lratio(1:48)=softbits(9:9+47)
|
||||
lratio(49:128)=softbits(65:65+80-1)
|
||||
llr=2.0*lratio/(sigma*sigma)
|
||||
lratio=exp(2.0*lratio/(sigma*sigma))
|
||||
|
||||
max_iterations=10
|
||||
max_dither=1
|
||||
call timer('bpdec144 ',0)
|
||||
call bpdecode144(llr,max_iterations,decoded,niterations)
|
||||
call timer('bpdec144 ',1)
|
||||
if( niterations .ge. 0.0 ) then
|
||||
call extractmessage144(decoded,msgreceived,nhashflag)
|
||||
if( nhashflag .gt. 0 ) then ! CRCs match, so print it
|
||||
ndupe=0
|
||||
do im=1,nmessages
|
||||
if( allmessages(im) .eq. msgreceived ) ndupe=1
|
||||
enddo
|
||||
if( ndupe .eq. 0 ) then
|
||||
nmessages=nmessages+1
|
||||
allmessages(nmessages)=msgreceived
|
||||
write(lines(nmessages),1020) nutc,nsnr,t0,nint(fest),msgreceived
|
||||
1020 format(i6.6,i4,f5.1,i5,' ^ ',a22)
|
||||
endif
|
||||
goto 999
|
||||
else
|
||||
msgreceived=' '
|
||||
ndither=-99 ! -99 is bad hash flag
|
||||
endif
|
||||
endif
|
||||
enddo ! slicer dither
|
||||
enddo ! peak loop
|
||||
enddo
|
||||
msgreceived=' '
|
||||
ndither=-98
|
||||
999 continue
|
||||
return
|
||||
end subroutine opdetmsk144
|
||||
@ -108,7 +108,7 @@ extern "C" {
|
||||
float* level, float* sigdb, float* snr, float* dfreq,
|
||||
float* width);
|
||||
|
||||
void fast_decode_(short id2[], int narg[], int* ntrperiod, bool* bShMsgs,
|
||||
void fast_decode_(short id2[], int narg[], int* ntrperiod,
|
||||
char msg[], char mycall[], char hiscall[],
|
||||
int len1, int len2, int len3);
|
||||
void degrade_snr_(short d2[], int* n, float* db, float* bandwidth);
|
||||
@ -2383,7 +2383,7 @@ void MainWindow::decode() //decode()
|
||||
narg[14]=m_config.aggressive();
|
||||
memcpy(d2b,dec_data.d2,2*360000);
|
||||
watcher3.setFuture (QtConcurrent::run (std::bind (fast_decode_,&d2b[0],
|
||||
&narg[0],&m_TRperiod,&m_bShMsgs,&m_msg[0][0],
|
||||
&narg[0],&m_TRperiod,&m_msg[0][0],
|
||||
dec_data.params.mycall,dec_data.params.hiscall,8000,12,12)));
|
||||
} else {
|
||||
memcpy(to, from, qMin(mem_jt9->size(), size));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user