mirror of
https://github.com/saitohirga/WSJT-X.git
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Remove obsolete msk144 routines.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6773 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
45c36a5738
commit
fea1f88dce
@ -399,7 +399,6 @@ set (wsjt_FSRCS
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lib/morse.f90
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lib/morse.f90
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lib/move.f90
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lib/move.f90
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lib/mskdt.f90
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lib/mskdt.f90
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lib/msk144dt.f90
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lib/msk144d.f90
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lib/msk144d.f90
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lib/msk144_decode.f90
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lib/msk144_decode.f90
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lib/options.f90
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lib/options.f90
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@ -441,7 +440,6 @@ set (wsjt_FSRCS
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lib/sync9w.f90
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lib/sync9w.f90
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lib/synciscat.f90
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lib/synciscat.f90
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lib/syncmsk.f90
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lib/syncmsk.f90
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lib/syncmsk144.f90
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lib/timer_C_wrapper.f90
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lib/timer_C_wrapper.f90
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lib/timer_impl.f90
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lib/timer_impl.f90
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lib/timer_module.f90
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lib/timer_module.f90
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@ -1,78 +0,0 @@
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subroutine msk144dt(d,npts,ty,yellow,nyel)
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parameter (NFFT=1024,NH=NFFT/2)
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real d(npts)
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real x(0:NFFT-1)
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real green(703)
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real yellow(703) !703 = 30*12000/512
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real ty(703)
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real y2(175)
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real ty2(175)
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integer indx(703)
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logical ok
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complex c(0:NH)
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equivalence (x,c)
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df=12000.0/NFFT
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i1=nint(300.0/df)
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i2=nint(800.0/df)
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i3=nint(2200.0/df)
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i4=nint(2700.0/df)
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nblks=npts/NH - 1
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do j=1,nblks
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ib=(j+1)*NH
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ia=ib-NFFT+1
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x=d(ia:ib)
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call four2a(x,NFFT,1,-1,0) !r2c FFT
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sqlow=0.
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do i=i1,i2
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sqlow=sqlow + real(c(i))**2 + aimag(c(i))**2
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enddo
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sqmid=0.
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do i=i2,i3
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sqmid=sqmid + real(c(i))**2 + aimag(c(i))**2
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enddo
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sqhigh=0.
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do i=i3,i4
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sqhigh=sqhigh + real(c(i))**2 + aimag(c(i))**2
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enddo
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green(j)=db(sqlow+sqmid+sqhigh)
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yellow(j)=db(sqmid/(sqlow+sqhigh))
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ty(j)=j*512.0/12000.0
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enddo
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npct=20
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call pctile(green,nblks,npct,base)
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green(1:nblks)=green(1:nblks) - base - 0.3
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call pctile(yellow,nblks,npct,base)
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yellow(1:nblks)=yellow(1:nblks) - base - 0.6
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call indexx(yellow,nblks,indx)
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do j=1,nblks/4
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k=indx(nblks+1-j)
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ty(j)=ty(k)
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yellow(j)=yellow(k)
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if(yellow(j).lt.1.4) exit
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enddo
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nyel=j-1
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k=1
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y2(1)=yellow(1)
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ty2(1)=ty(1)
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do j=2,nyel
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ok=.true.
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do i=1,j-1
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if(abs(ty(i)-ty(j)).lt.0.05) ok=.false.
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enddo
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if(ok) then
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k=k+1
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y2(k)=yellow(j)
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ty2(k)=ty(j)
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endif
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enddo
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nyel=k
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yellow(1:nyel)=y2(1:nyel)
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ty(1:nyel)=ty2(1:nyel)
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return
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end subroutine msk144dt
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@ -1,357 +0,0 @@
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subroutine syncmsk144(cdat,npts,pchk_file,msgreceived,fest,nutc,t0)
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!nutc and t0 are for debug output
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use iso_c_binding, only: c_loc,c_size_t
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use packjt
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use hashing
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use timer_module, only: timer
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parameter (NSPM=864)
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character*22 msgreceived
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character*512 pchk_file,gen_file
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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(6000)
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complex cb(42) !Complex waveform for sync word
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complex cfac,cca,ccb
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complex cc(npts)
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complex cc1(npts)
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complex cc2(npts)
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complex bb(6)
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integer s8(8),hardbits(144),hardword(128),unscrambledhardbits(128)
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integer*1, target:: i1Dec8BitBytes(10)
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integer, dimension(1) :: iloc
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integer*4 i4Dec6BitWords(12)
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integer*1 decoded(80)
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integer*1 i1hashdec
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integer ipeaks(10)
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logical ismask(6000)
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real cbi(42),cbq(42)
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real tonespec(6000)
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real rcw(12)
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real dd(npts)
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real pp(12) !Half-sine pulse shape
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real*8 dt, df, fs, pi, twopi
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real softbits(144)
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real*8 unscrambledsoftbits(128)
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real lratio(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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save first,cb,pi,twopi,dt,s8,rcw,pp
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if(first) then
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i=index(pchk_file,".pchk")
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gen_file=pchk_file(1:i-1)//".gen"
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call init_ldpc(trim(pchk_file)//char(0),trim(gen_file)//char(0))
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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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dt=1.0/12000.0
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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 waveform
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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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first=.false.
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endif
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! Coarse carrier frequency sync
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! look for tones near 2k and 4k in the (analytic signal)**2 spectrum
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! search range for coarse frequency error is +/- 100 Hz
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fs=12000.0
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nfft=6000 !using a zero-padded fft to get 2 Hz bins
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df=fs/nfft
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ctmp=cmplx(0.0,0.0)
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ctmp(1:npts)=cdat**2
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ctmp(1:12)=ctmp(1:12)*rcw
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ctmp(npts-11:npts)=ctmp(npts-11:npts)*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(1901:2101)=.true. ! high tone search window
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iloc=maxloc(tonespec,ismask)
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ihpk=iloc(1)
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ah=tonespec(ihpk)
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ismask=.false.
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ismask(901:1101)=.true. ! window for low tone
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iloc=maxloc(tonespec,ismask)
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ilpk=iloc(1)
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al=tonespec(ilpk)
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fdiff=(ihpk-ilpk)*df
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ferrh=(ihpk-2001)*df/2.0
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ferrl=(ilpk-1001)*df/2.0
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if( abs(fdiff-2000) .le. 16.0 ) then
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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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else
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msgreceived=' '
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phase0=-97 !-97 is failed carrier sync, -98 failure to decode, -99 decoded, bad hash
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niterations=0
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ndither=0
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i1hashdec=0
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fest=0.0
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i1Dec8BitBytes=0
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nbadsync1=-1
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nbadsync2=-1
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goto 999
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endif
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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 - the resulting complex
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! correlations provide all synch information.
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cc=0
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cc1=0
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cc2=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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! Find 5 largest peaks
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do ipk=1,5
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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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! See if we can find "closed brackets" - a pair of peaks that differ by 864, plus or minus
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! This information is not yet used for anything
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! do ii=1,5
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! do jj=ii+1,5
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! if( (ii .ne. jj) .and. (abs( abs(ipeaks(ii)-ipeaks(jj))-864) .le. 5) ) then
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! write(*,*) "closed brackets: ",ii,jj,ipeaks(ii),ipeaks(jj),abs(ipeaks(ii)-ipeaks(jj))
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! endif
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! enddo
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! enddo
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do ipk=1,5
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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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! bb lag used to place the sampling index at the center of the eye
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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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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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! Remove fine frequency error
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call tweak1(cdat,npts,-ferr2,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=1,7
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! Try each of the three frames individually, and then
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! do frame averaging on passes 4 and 5
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if( 0 .eq. 1 ) then
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if( iav .eq. 1 ) then
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c=cdat2(1:NSPM)
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elseif( iav .eq. 2 ) then
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c=cdat2(NSPM+1:2*NSPM)
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elseif( iav .eq. 3 ) then
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c=cdat2(2*NSPM+1:npts)
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elseif( iav .eq. 4 ) then
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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
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elseif( iav .eq. 5 ) then
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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
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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(1:NSPM)+cdat2(NSPM+1:2*NSPM)
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elseif( iav .eq. 8 ) then
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c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:npts)
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elseif( iav .eq. 9 ) 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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endif
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if( iav .eq. 1 ) then
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c(1:NSPM)=cdat2(NSPM+1:2*NSPM) !avg 1 frame to the right of ic
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elseif( iav .eq. 2 ) then
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c=cdat2(NSPM-431:NSPM+432) !1 frame centered on ic
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c=cshift(c,-432)
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elseif( iav .eq. 3 ) then !1 frame to the left of ic
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c=cdat2(1:NSPM)
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elseif( iav .eq. 4 ) then
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c=cdat2(NSPM+432:NSPM+432+863) !1 frame beginning 36ms to the right of ic
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c=cshift(c,432)
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elseif( iav .eq. 5 ) then
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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
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elseif( iav .eq. 6 ) then
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c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:npts)
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elseif( iav .eq. 7 ) then
|
|
||||||
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:npts)
|
|
||||||
endif
|
|
||||||
|
|
||||||
! Estimate final frequency error and carrier phase.
|
|
||||||
cca=sum(c(1:1+41)*conjg(cb))
|
|
||||||
ccb=sum(c(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))
|
|
||||||
|
|
||||||
cfac=cmplx(cos(phase0),sin(phase0))
|
|
||||||
c=c*conjg(cfac)
|
|
||||||
|
|
||||||
! 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
|
|
||||||
|
|
||||||
! matched filter
|
|
||||||
softbits(1)=sum(imag(c(1:6))*pp(7:12))+sum(imag(c(864-5:864))*pp(1:6))
|
|
||||||
softbits(2)=sum(real(c(1:12))*pp)
|
|
||||||
do i=2,72
|
|
||||||
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
|
|
||||||
|
|
||||||
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
|
|
||||||
if( nbadsync .gt. 4 ) cycle
|
|
||||||
|
|
||||||
! this could be used to count the number of hard errors that were corrected
|
|
||||||
hardword(1:48)=hardbits(9:9+47)
|
|
||||||
hardword(49:128)=hardbits(65:65+80-1)
|
|
||||||
unscrambledhardbits(1:127:2)=hardword(1:64)
|
|
||||||
unscrambledhardbits(2:128:2)=hardword(65:128)
|
|
||||||
|
|
||||||
! 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=0.65
|
|
||||||
lratio(1:48)=softbits(9:9+47)
|
|
||||||
lratio(49:128)=softbits(65:65+80-1)
|
|
||||||
lratio=exp(2.0*lratio/(sigma*sigma))
|
|
||||||
|
|
||||||
unscrambledsoftbits(1:127:2)=lratio(1:64)
|
|
||||||
unscrambledsoftbits(2:128:2)=lratio(65:128)
|
|
||||||
|
|
||||||
max_iterations=20
|
|
||||||
max_dither=50
|
|
||||||
call ldpc_decode(unscrambledsoftbits, decoded, max_iterations, niterations, max_dither, ndither)
|
|
||||||
|
|
||||||
if( niterations .ge. 0.0 ) then
|
|
||||||
goto 778
|
|
||||||
endif
|
|
||||||
|
|
||||||
enddo
|
|
||||||
enddo
|
|
||||||
enddo
|
|
||||||
|
|
||||||
msgreceived=' '
|
|
||||||
phase0=-98
|
|
||||||
i1hashdec=0
|
|
||||||
goto 999
|
|
||||||
|
|
||||||
778 continue
|
|
||||||
! The decoder found a codeword - compare decoded hash with calculated
|
|
||||||
! Collapse 80 decoded bits to 10 bytes. Bytes 1-9 are the message, byte 10 is the hash
|
|
||||||
do ibyte=1,10
|
|
||||||
itmp=0
|
|
||||||
do ibit=1,8
|
|
||||||
itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
|
|
||||||
enddo
|
|
||||||
i1Dec8BitBytes(ibyte)=itmp
|
|
||||||
enddo
|
|
||||||
|
|
||||||
! Calculate the hash using the first 9 bytes.
|
|
||||||
ihashdec=nhash(c_loc(i1Dec8BitBytes),int(9,c_size_t),146)
|
|
||||||
ihashdec=2*iand(ihashdec,255)
|
|
||||||
|
|
||||||
! Compare calculated hash with received byte 10 - if they agree, keep the message.
|
|
||||||
i1hashdec=ihashdec
|
|
||||||
|
|
||||||
if( i1hashdec .eq. i1Dec8BitBytes(10) ) then
|
|
||||||
! Good hash --- unpack 72-bit message
|
|
||||||
do ibyte=1,12
|
|
||||||
itmp=0
|
|
||||||
do ibit=1,6
|
|
||||||
itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*6+ibit))
|
|
||||||
enddo
|
|
||||||
i4Dec6BitWords(ibyte)=itmp
|
|
||||||
enddo
|
|
||||||
call unpackmsg(i4Dec6BitWords,msgreceived)
|
|
||||||
else
|
|
||||||
msgreceived=' '
|
|
||||||
phase0=-99
|
|
||||||
endif
|
|
||||||
|
|
||||||
999 continue
|
|
||||||
! write(78,1001) nutc,t0,iav,ipk,is,fdiff,fest,ffin,nbadsync1,nbadsync2, &
|
|
||||||
! phase0,niterations,ndither,i1hashdec,i1Dec8BitBytes(10),msgreceived
|
|
||||||
!1001 format(i6,f8.2,i4,i4,i4,f8.2,f8.2,f8.2,i4,i4,f8.2,i4,i4,i4,i4,2x,a22)
|
|
||||||
|
|
||||||
return
|
|
||||||
end subroutine syncmsk144
|
|
||||||
Loading…
Reference in New Issue
Block a user