mirror of https://github.com/saitohirga/WSJT-X.git
More work on msk144.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6778 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
9734a70242
commit
469b57cbd0
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@ -1,12 +1,7 @@
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subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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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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use timer_module, only: timer
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parameter (NSPM=864, NPTS=3*NSPM)
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parameter (NSPM=864, NPTS=3*NSPM, MAXSTEPS=1500)
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integer, parameter :: nstep=693
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character*22 msgreceived,allmessages(20)
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character*22 msgreceived,allmessages(20)
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character*80 lines(100)
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character*80 lines(100)
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character*512 pchk_file,gen_file
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character*512 pchk_file,gen_file
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@ -22,17 +17,14 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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complex cc2(NPTS)
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complex cc2(NPTS)
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complex bb(6)
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complex bb(6)
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integer s8(8),hardbits(144)
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integer s8(8),hardbits(144)
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integer*1, target:: i1Dec8BitBytes(10)
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integer, dimension(1) :: iloc
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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 decoded(80)
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integer*1 i1hashdec
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integer indices(MAXSTEPS)
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integer indices(nstep)
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integer ipeaks(10)
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integer ipeaks(10)
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logical ismask(6000)
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logical ismask(6000)
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real cbi(42),cbq(42)
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real cbi(42),cbq(42)
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real detmet(-2:nstep+3)
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real detmet(-2:MAXSTEPS+3)
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real detfer(nstep)
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real detfer(MAXSTEPS)
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real tonespec(6000)
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real tonespec(6000)
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real rcw(12)
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real rcw(12)
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real dd(NPTS)
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real dd(NPTS)
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@ -46,11 +38,11 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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real lratio(128)
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real lratio(128)
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logical first
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logical first
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data first/.true./
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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 s8/0,1,1,1,0,0,1,0/
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save df,first,cb,fs,nfft,pi,twopi,dt,s8,rcw,pp
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save df,first,cb,fs,nfft,pi,twopi,dt,s8,rcw,pp
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if(first) then
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if(first) then
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nmatchedfilter=1
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i=index(pchk_file,".pchk")
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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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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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call init_ldpc(trim(pchk_file)//char(0),trim(gen_file)//char(0))
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@ -84,12 +76,12 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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endif
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endif
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! fill the detmet, detferr arrays
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! fill the detmet, detferr arrays
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nstep=(n-NSPM)/256
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detmet=0
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detmet=0
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do istp=1,nstep
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do istp=1,nstep
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ns=1+256*(istp-1)
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ns=1+256*(istp-1)
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ne=ns+NPTS-1
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ne=ns+NPTS-1
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if( ne .gt. n ) exit
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if( ne .gt. n ) exit
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tt=(ns+ne)/2.0/12000.0
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cdat=cbig(ns:ne)
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cdat=cbig(ns:ne)
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! Coarse carrier frequency sync - seek tones at 2000 Hz and 4000 Hz in
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! Coarse carrier frequency sync - seek tones at 2000 Hz and 4000 Hz in
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@ -127,7 +119,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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endif
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endif
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detmet(istp)=ah+al
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detmet(istp)=ah+al
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detfer(istp)=ferr
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detfer(istp)=ferr
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enddo ! end of detection-metric, snr, and frequency error estimation loop
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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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call indexx(detmet(1:nstep),nstep,indices) !find median of detection metric vector
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xmed=detmet(indices(nstep/2))
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xmed=detmet(indices(nstep/2))
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@ -138,7 +130,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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do ip=1,20 ! use something like the "clean" algorithm to find candidates
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do ip=1,20 ! use something like the "clean" algorithm to find candidates
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iloc=maxloc(detmet(1:nstep))
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iloc=maxloc(detmet(1:nstep))
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il=iloc(1)
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il=iloc(1)
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if( (detmet(il) .lt. 2.0) .or. (abs(detfer(il)) .gt. 100.0) ) cycle
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if( (detmet(il) .lt. 1.5) .or. (abs(detfer(il)) .gt. 100.0) ) cycle
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ndet=ndet+1
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ndet=ndet+1
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times(ndet)=((il-1)*256+NPTS/2)*dt
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times(ndet)=((il-1)*256+NPTS/2)*dt
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ferrs(ndet)=detfer(il)
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ferrs(ndet)=detfer(il)
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@ -188,7 +180,6 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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ic0=ipeaks(ipk)
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ic0=ipeaks(ipk)
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! fine adjustment of sync index
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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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do i=1,6
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if( ic0+11+NSPM .le. NPTS ) then
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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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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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@ -201,7 +192,8 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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bba=abs(bb(ibb))
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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 .le. 3 ) ibb=ibb-1
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if( ibb .gt. 3 ) ibb=ibb-7
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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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do id=1,3 ! slicer dither. bb is very good - may be able to remove this.
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if( id .eq. 1 ) is=0
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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. 2 ) is=-1
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if( id .eq. 3 ) is=1
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if( id .eq. 3 ) is=1
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@ -224,152 +216,136 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
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endif
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endif
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! Final estimate of the carrier frequency - returned to the calling program
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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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fest=1500+ferr+ferr2
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do idf=0,10 ! 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/2.0
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else
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deltaf=-(idf+1)/2.0
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endif
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! Remove fine frequency error
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! Remove fine frequency error
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call tweak1(cdat,NPTS,-ferr2,cdat2)
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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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! place the beginning of frame at index NSPM+1
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cdat2=cshift(cdat2,ic-(NSPM+1))
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cdat2=cshift(cdat2,ic-(NSPM+1))
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do iav=1,7 ! try each of 7 averaging patterns, hope that one works
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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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if( iav .eq. 1 ) then
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c=cdat2(NSPM+1:2*NSPM)
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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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elseif( iav .eq. 2 ) then
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c=cdat2(NSPM-431:NSPM+432)
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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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c=cshift(c,-432)
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elseif( iav .eq. 3 ) then
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elseif( iav .eq. 3 ) then !1 frame to the left of ic
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c=cdat2(2*NSPM-431:2*NSPM+432)
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c=cdat2(1:NSPM)
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c=cshift(c,-432)
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elseif( iav .eq. 4 ) then
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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=cdat2(1:NSPM)
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c=cshift(c,432)
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elseif( iav .eq. 5 ) then
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elseif( iav .eq. 5 ) then
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c=cdat2(2*NSPM+1:NPTS)
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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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elseif( iav .eq. 6 ) then
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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
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c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
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elseif( iav .eq. 7 ) then
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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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c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
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elseif( iav .eq. 8 ) then
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endif
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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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! Estimate final frequency error and carrier phase.
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cca=sum(c(1:1+41)*conjg(cb))
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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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ccb=sum(c(1+56*6:1+56*6+41)*conjg(cb))
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cfac=ccb*conjg(cca)
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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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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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phase0=atan2(imag(cca+ccb),real(cca+ccb))
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! Remove phase error - want constellation such that sample points lie on re,im axes
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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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cfac=cmplx(cos(phase0),sin(phase0))
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c=c*conjg(cfac)
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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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! sample to get softsamples
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! do i=1,72
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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-1)=imag(c(1+(i-1)*12))
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! softbits(2*i)=real(c(7+(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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enddo
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else
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! matched filter - might be possible to improve this
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! matched filter -
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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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! how much mismatch does the RX/TX/analytic filter cause?, how rig (pair) dependent is this loss?
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softbits(2)=sum(real(c(1:12))*pp)
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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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do i=2,72
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softbits(2)=sum(real(c(1:12))*pp)
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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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do i=2,72
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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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softbits(2*i-1)=sum(imag(c(1+(i-1)*12-6:1+(i-1)*12+5))*pp)
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enddo
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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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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
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endif
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endif
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enddo
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nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8 ) )/2
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! sync word hard error weight is a good discriminator for
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nbadsync2=(8-sum( (2*hardbits(1+56:8+56)-1)*s8 ) )/2
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! frames that have reasonable probability of decoding
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nbadsync=nbadsync1+nbadsync2
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hardbits=0
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if( nbadsync .gt. 4 ) cycle
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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
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endif
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enddo
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nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8 ) )/2
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nbadsync2=(8-sum( (2*hardbits(1+56:8+56)-1)*s8 ) )/2
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nbadsync=nbadsync1+nbadsync2
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if( nbadsync .gt. 6 ) cycle
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! normalize the softsymbols before submitting to decoder
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! normalize the softsymbols before submitting to decoder
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sav=sum(softbits)/144
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sav=sum(softbits)/144
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s2av=sum(softbits*softbits)/144
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s2av=sum(softbits*softbits)/144
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ssig=sqrt(s2av-sav*sav)
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ssig=sqrt(s2av-sav*sav)
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softbits=softbits/ssig
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softbits=softbits/ssig
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sigma=0.65
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sigma=0.65
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lratio(1:48)=softbits(9:9+47)
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lratio(1:48)=softbits(9:9+47)
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lratio(49:128)=softbits(65:65+80-1)
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lratio(49:128)=softbits(65:65+80-1)
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lratio=exp(2.0*lratio/(sigma*sigma))
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lratio=exp(2.0*lratio/(sigma*sigma))
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unscrambledsoftbits(1:127:2)=lratio(1:64)
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unscrambledsoftbits(1:127:2)=lratio(1:64)
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unscrambledsoftbits(2:128:2)=lratio(65:128)
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unscrambledsoftbits(2:128:2)=lratio(65:128)
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max_iterations=20
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max_iterations=20
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max_dither=1
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max_dither=1
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call ldpc_decode(unscrambledsoftbits, decoded, &
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call ldpc_decode(unscrambledsoftbits, decoded, &
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max_iterations, niterations, max_dither, ndither)
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max_iterations, niterations, max_dither, ndither)
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if( niterations .ge. 0.0 ) then
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if( niterations .ge. 0.0 ) then
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goto 778
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call extractmessage144(decoded,msgreceived,nhashflag)
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endif
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if( nhashflag .gt. 0 ) then ! CRCs match, so print it
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ndupe=0
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enddo ! frame averaging loop
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do im=1,nmessages
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if( allmessages(im) .eq. msgreceived ) ndupe=1
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enddo
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if( ndupe .eq. 0 ) then
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nmessages=nmessages+1
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allmessages(nmessages)=msgreceived
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write(lines(nmessages),1020) nutc,nsnr,t0,nint(fest),msgreceived
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1020 format(i6.6,i4,f5.1,i5,' & ',a22)
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endif
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goto 999
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else
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msgreceived=' '
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ndither=-99 ! -99 is bad hash flag
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! write(78,1001) nutc,t0,nsnr,ipk,is,idf,iav,deltaf,fest,ffin,nbadsync1,nbadsync2, &
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! phase0,niterations,ndither,msgreceived
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endif
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endif
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enddo ! frame averaging loop
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enddo ! frequency dithering loop
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enddo ! sample-time dither loop
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enddo ! sample-time dither loop
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enddo ! peak loop - could be made more efficient
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enddo ! peak loop - could be made more efficient by working harder to find good peaks
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msgreceived=' '
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msgreceived=' '
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phase0=-98
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ndither=-98
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i1hashdec=0
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goto 999
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778 continue
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! The decoder found a codeword - compare decoded hash with calculated
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! Collapse 80 decoded bits to 10 bytes. Bytes 1-9 are the message, byte 10 is the hash
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do ibyte=1,10
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itmp=0
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do ibit=1,8
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itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
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enddo
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i1Dec8BitBytes(ibyte)=itmp
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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
|
|
||||||
if( msgreceived .ne. ' ' ) then
|
|
||||||
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
|
|
||||||
endif
|
|
||||||
|
|
||||||
999 continue
|
999 continue
|
||||||
! write(78,1001) nutc,t0,iav,ipk,is,fest,ffin,nbadsync1,nbadsync2, &
|
! write(78,1001) nutc,t0,nsnr,ipk,is,idf,iav,deltaf,fest,ffin,nbadsync1,nbadsync2, &
|
||||||
! phase0,niterations,ndither,i1hashdec,i1Dec8BitBytes(10),msgreceived
|
! phase0,niterations,ndither,msgreceived
|
||||||
!1001 format(i6,f8.2,i4,i4,i4,f8.2,f8.2,i4,i4,f8.2,i4,i4,i4,i4,2x,a22)
|
!1001 format(i6.6,f8.2,i4,i4,i4,i4,i4,f8.2,f8.2,f8.2,i4,i4,f8.2,i5,i5,2x,a22)
|
||||||
|
|
||||||
enddo
|
enddo
|
||||||
return
|
return
|
||||||
end subroutine detectmsk144
|
end subroutine detectmsk144
|
||||||
|
|
|
||||||
|
|
@ -12,8 +12,8 @@ program msk144d
|
||||||
character*512 pchk_file
|
character*512 pchk_file
|
||||||
logical :: display_help=.false.
|
logical :: display_help=.false.
|
||||||
type(wav_header) :: wav
|
type(wav_header) :: wav
|
||||||
integer*2 id2(15*12000)
|
integer*2 id2(30*12000)
|
||||||
character*80 infile
|
character*500 infile
|
||||||
character(len=500) optarg
|
character(len=500) optarg
|
||||||
|
|
||||||
type (option) :: long_options(2) = [ &
|
type (option) :: long_options(2) = [ &
|
||||||
|
|
@ -60,7 +60,8 @@ program msk144d
|
||||||
i1=index(infile,'.wav')
|
i1=index(infile,'.wav')
|
||||||
if( i1 .eq. 0 ) i1=index(infile,'.WAV')
|
if( i1 .eq. 0 ) i1=index(infile,'.WAV')
|
||||||
read(infile(i1-6:i1-1),*,err=998) nutc
|
read(infile(i1-6:i1-1),*,err=998) nutc
|
||||||
npts=15*12000
|
inquire(FILE=infile,SIZE=isize)
|
||||||
|
npts=min((isize-216)/2,360000)
|
||||||
read(unit=wav%lun) id2(1:npts)
|
read(unit=wav%lun) id2(1:npts)
|
||||||
close(unit=wav%lun)
|
close(unit=wav%lun)
|
||||||
call timer('read ',1)
|
call timer('read ',1)
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue