Changes to existing files needed to accommodate short (16ms) msk messages.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6869 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

CMakeLists.txt

@@ -322,6 +322,7 @@ set (wsjt_FSRCS
   lib/degrade_snr.f90
   lib/demod64a.f90
   lib/detectmsk144.f90
+  lib/detectmsk32.f90
   lib/determ.f90
   lib/downsam9.f90
   lib/encode232.f90
@@ -359,6 +360,7 @@ set (wsjt_FSRCS
   lib/geniscat.f90
   lib/genmsk.f90
   lib/genmsk144.f90
+  lib/genmsk32.f90
   lib/genmsk_short.f90
   lib/genqra64.f90
   lib/genwspr.f90

lib/detectmsk144.f90

@@ -11,12 +11,16 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
   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 cc(NPTS)
+  complex ccr(NPTS)
   complex cc1(NPTS)
   complex cc2(NPTS)
+  complex ccr1(NPTS)
+  complex ccr2(NPTS)
   complex bb(6)
-  integer s8(8),hardbits(144)
+  integer s8(8),s8r(8),hardbits(144)
   integer, dimension(1) :: iloc
   integer*1 decoded(80)   
   integer indices(MAXSTEPS)
@@ -28,6 +32,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
   real hannwindow(NPTS)
   real rcw(12)
   real dd(NPTS)
+  real ddr(NPTS)
   real ferrs(MAXCAND)
   real pp(12)                          !Half-sine pulse shape
   real snrs(MAXCAND)
@@ -40,6 +45,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
   logical first
   data first/.true./
   data s8/0,1,1,1,0,0,1,0/
+  data s8r/1,0,1,1,0,0,0,1/
   save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,hannwindow,nmatchedfilter
 
   if(first) then
@@ -64,7 +70,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
        hannwindow(i)=0.5*(1-cos(twopi*(i-1)/NPTS))
      enddo
 
-! define the sync word waveform
+! define the sync word waveforms
      s8=2*s8-1  
      cbq(1:6)=pp(7:12)*s8(1)
      cbq(7:18)=pp*s8(3)
@@ -75,6 +81,16 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
      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
@@ -160,7 +176,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
   allmessages=char(0)
   lines=char(0)
 
-  do ip=1,ndet  !run through the candidates and try to sync/demod/decode
+  do ip=1,1  !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
@@ -175,14 +191,27 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
 ! attempt frame synchronization
 ! correlate with sync word waveforms
     cc=0
+    ccr=0
     cc1=0
     cc2=0
+    ccr1=0
+    ccr2=0
     do i=1,NPTS-(56*6+41)
       cc1(i)=sum(cdat(i:i+41)*conjg(cb))
       cc2(i)=sum(cdat(i+56*6:i+56*6+41)*conjg(cb))
     enddo
     cc=cc1+cc2
     dd=abs(cc1)*abs(cc2)
+    do i=1,NPTS-(32*6+41)
+      ccr1(i)=sum(cdat(i:i+41)*conjg(cbr))
+      ccr2(i)=sum(cdat(i+32*6:i+32*6+41)*conjg(cbr))
+    enddo
+    ccr=ccr1+ccr2
+    ddr=abs(ccr1)*abs(ccr2)
+    cmax=maxval(abs(cc))
+    crmax=maxval(abs(ccr))
+    ishort=0
+    if( crmax .gt. cmax ) ishort=1
 
 ! Find 6 largest peaks
     do ipk=1,6
@@ -325,7 +354,7 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
             ssig=sqrt(s2av-sav*sav)
             softbits=softbits/ssig
 
-            sigma=0.65
+            sigma=0.75
             lratio(1:48)=softbits(9:9+47)
             lratio(49:128)=softbits(65:65+80-1)
             lratio=exp(2.0*lratio/(sigma*sigma))
@@ -355,8 +384,8 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
               else
                 msgreceived=' '
                 ndither=-99             ! -99 is bad hash flag
-!                write(78,1001) nutc,t0,nsnr,ic,ipk,is,idf,iav,deltaf,fest,ferr,ferr2,ffin,bba,bbp,nbadsync1,nbadsync2, &
+                write(78,1001) nutc,t0,nsnr,ic,ipk,is,idf,iav,deltaf,fest,ferr,ferr2,ffin,bba,bbp,nbadsync1,nbadsync2, &
-!                             phase0,niterations,ndither,msgreceived
+                             phase0,niterations,ndither,msgreceived
               endif
             endif
           enddo ! frame averaging loop
@@ -368,10 +397,10 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc)
     ndither=-98   
 999 continue
     if( nmessages .ge. 1 ) then 
-!      write(78,1001) nutc,t0,nsnr,ic,ipk,is,idf,iav,deltaf,fest,ferr,ferr2,ffin,bba,bbp,nbadsync1,nbadsync2, &
+      write(78,1001) nutc,t0,nsnr,ic,ipk,is,idf,iav,deltaf,fest,ferr,ferr2,ffin,bba,bbp,nbadsync1,nbadsync2, &
-!               phase0,niterations,ndither,msgreceived
+               phase0,niterations,ndither,msgreceived
-!      call flush(78)
+      call flush(78)
-!1001 format(i6.6,f8.2,i5,i5,i5,i5,i5,i5,f8.2,f8.2,f8.2,f8.2,f8.2,f10.2,f8.2,i5,i5,f8.2,i5,i5,2x,a22)
+1001 format(i6.6,f8.2,i5,i5,i5,i5,i5,i5,f8.2,f8.2,f8.2,f8.2,f8.2,f10.2,f8.2,i5,i5,f8.2,i5,i5,2x,a22)
       exit
     endif
   enddo

lib/genmsk144.f90

@@ -82,9 +82,9 @@ subroutine genmsk144(msg0,ichk,msgsent,i4tone,itype,pchk_file)
      enddo
 
      if(message(1:1).eq.'<') then
-        call genmsk_short(message,msgsent,ichk,i4tone,itype)
+        call genmsk32(message,msgsent,ichk,i4tone,itype)
         if(itype.lt.0) go to 999
-        i4tone(36)=-35
+        i4tone(33)=-35
         go to 999
      endif
 

lib/msk144_decode.f90

@@ -1,6 +1,6 @@
 subroutine msk144_decode(id2,npts,nutc,nprint,pchk_file,line)
 
-! Calls the experimental decoder for JTMSK 72ms ldpc messages
+! Calls the experimental decoder for MSK 72ms/16ms messages
 
   parameter (NMAX=30*12000)
   parameter (NFFTMAX=512*1024)
@@ -10,7 +10,6 @@ subroutine msk144_decode(id2,npts,nutc,nprint,pchk_file,line)
   complex c(NFFTMAX)                   !Complex (analytic) data
   character*80 line(100)               !Decodes passed back to caller
   character*512 pchk_file
-!  equivalence (hist,d)
 
   line(1:100)(1:1)=char(0)
 
@@ -36,6 +35,16 @@ subroutine msk144_decode(id2,npts,nutc,nprint,pchk_file,line)
       write(*,'(a80)') line(i)
     enddo
   endif
-  if(line(1)(1:6).eq.'      ') line(1)(1:1)=char(0)
+
+  if(nline .eq. 0) then
+    call detectmsk32(c,npts,line,nline,nutc)
+  endif
+
+  if( nprint .ne. 0 ) then
+    do i=1,nline
+      write(*,'(a80)') line(i)
+    enddo
+  endif
+
   return
 end subroutine msk144_decode

lib/msk144sim.f90

@@ -6,13 +6,11 @@ program msk144sim
   real waveform(0:NMAX-1)
   character arg*8,msg*22,msgsent*22,fname*40
   character*512 pchk_file
-  character*3 rpt(0:7)
   real wave(0:NMAX-1)              !Simulated received waveform
   real*8 twopi,freq,phi,dphi0,dphi1,dphi
   type(hdr) h                          !Header for .wav file
   integer*2 iwave(0:NMAX-1)
   integer itone(144)                   !Message bits
-  data rpt /'26 ','27 ','28 ','R26','R27','R28','RRR','73 '/
 
   pchk_file='./peg-128-80-reg3.pchk'
 
@@ -41,13 +39,15 @@ program msk144sim
   call genmsk144(msg,ichk,msgsent,itone,itype,pchk_file) 
   twopi=8.d0*atan(1.d0)
 
+  nsym=144
+  if( itone(33) .lt. 0 ) nsym=32
   dphi0=twopi*(freq-500)/12000.0
   dphi1=twopi*(freq+500)/12000.0
   phi=0.0
   indx=0
-  nreps=NMAX/(144*6)
+  nreps=NMAX/(nsym*6)
   do jrep=1,nreps
-    do i=1,144
+    do i=1,nsym
       if( itone(i) .eq. 0 ) then
         dphi=dphi0
       else
@@ -86,8 +86,6 @@ program msk144sim
      write(10) h,iwave               !Save the .wav file
      close(10)
 
-!     call jtmsk_short(cwave,NMAX,msg)
-
   enddo
 
 999 end program msk144sim