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msk144d now decodes msk40 frames.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6970 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-07-30 01:33:06 +00:00
parent 8bedcd755c
commit 0f49f343f6
2 changed files with 27 additions and 29 deletions
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7
lib/detectmsk144.f90
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@ -46,11 +46,12 @@ subroutine detectmsk144(cbig,n,pchk_file,lines,nmessages,nutc,ntol,t00)
data s8r/1,0,1,1,0,0,0,1/
save df,first,cb,fs,pi,twopi,dt,s8,rcw,pp,nmatchedfilter
i=index(pchk_file,".pchk")
gen_file=pchk_file(1:i-1)//".gen"
call init_ldpc(trim(pchk_file)//char(0),trim(gen_file)//char(0))
if(first) then
nmatchedfilter=1
i=index(pchk_file,".pchk")
gen_file=pchk_file(1:i-1)//".gen"
call init_ldpc(trim(pchk_file)//char(0),trim(gen_file)//char(0))
! define half-sine pulse and raised-cosine edge window
pi=4d0*datan(1d0)
twopi=8d0*datan(1d0)

49
lib/detectmsk40.f90
View File

@ -1,9 +1,9 @@
subroutine detectmsk40(cbig,n,mycall,partnercall,lines,nmessages,nutc,ntol,t00)
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=10)
character*4 rpt(0:63)
character*6 mycall,partnercall
character*6 mycall,hiscall
character*22 hashmsg,msgreceived
character*80 lines(100)
character*40 pchk_file,gen_file
@ -43,7 +43,7 @@ subroutine detectmsk40(cbig,n,mycall,partnercall,lines,nmessages,nutc,ntol,t00)
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,cbr,fs,nhashes,pi,twopi,dt,s8,s8r,rcw,pp,nmatchedfilter
save df,first,cb,cbr,fs,nhashes,pi,twopi,dt,s8,s8r,rcw,pp,nmatchedfilter,rpt
if(first) then
nmatchedfilter=1
@ -95,7 +95,7 @@ subroutine detectmsk40(cbig,n,mycall,partnercall,lines,nmessages,nutc,ntol,t00)
rpt(63)='73 '
do i=0,63
hashmsg=trim(mycall)//' '//trim(partnercall)//' '//rpt(i)
hashmsg=trim(mycall)//' '//trim(hiscall)//' '//rpt(i)
call fmtmsg(hashmsg,iz)
call hash(hashmsg,22,ihash)
nhashes(i)=iand(ihash,1023)
@ -187,13 +187,9 @@ subroutine detectmsk40(cbig,n,mycall,partnercall,lines,nmessages,nutc,ntol,t00)
! detmet(il)=0.0
enddo
! ndet=15
do ip=1,ndet
! times(ip)=ip+0.012
! snrs(ip)=-3.0
! ferrs(ip)=0.0
write(*,'(i5,f7.2,f7.2,f7.2)') ip,times(ip),snrs(ip),ferrs(ip)
enddo
! 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)
@ -225,9 +221,9 @@ subroutine detectmsk40(cbig,n,mycall,partnercall,lines,nmessages,nutc,ntol,t00)
ddr=abs(ccr1)*abs(ccr2)
crmax=maxval(abs(ccr))
do i=1,NPTS
write(14,*) i,abs(ccr(i)),ddr(i)
enddo
!do i=1,NPTS
!write(14,*) i,abs(ccr(i)),ddr(i)
!enddo
! Find 6 largest peaks
@ -239,9 +235,9 @@ enddo
ipeaks(ipk)=ic1
ccr(max(1,ic1-7):min(NPTS-40*6-41,ic1+7))=0.0
enddo
do i=1,6
write(*,*) i,ipeaks(i)
enddo
!do i=1,6
!write(*,*) i,ipeaks(i)
!enddo
do ipk=1,6
! we want ic to be the index of the first sample of the frame
@ -262,7 +258,7 @@ enddo
if( ibb .le. 3 ) ibb=ibb-1
if( ibb .gt. 3 ) ibb=ibb-7
do id=1,1 ! slicer dither.
do id=1,3 ! slicer dither.
if( id .eq. 1 ) is=0
if( id .eq. 2 ) is=-1
if( id .eq. 3 ) is=1
@ -286,13 +282,13 @@ enddo
! Final estimate of the carrier frequency - returned to the calling program
fest=1500+ferr+ferr2
do idf=0,0 ! frequency jitter
do idf=0,6 ! frequency jitter
if( idf .eq. 0 ) then
deltaf=0.0
elseif( mod(idf,2) .eq. 0 ) then
deltaf=2*idf
deltaf=4*idf
else
deltaf=-2*(idf+1)
deltaf=-4*(idf+1)
endif
! Remove fine frequency error
@ -316,7 +312,7 @@ enddo
cca=sum(c(1:1+41)*conjg(cb))
phase0=atan2(imag(cca),real(cca))
do ipha=1,1
do ipha=1,3
if( ipha.eq.2 ) phase0=phase0-20*pi/180.0
if( ipha.eq.3 ) phase0=phase0+20*pi/180.0
@ -347,7 +343,7 @@ enddo
nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8r ) )/2
nbadsync=nbadsync1
if( nbadsync .gt. 3 ) cycle
write(*,*) ip,id,nbadsync
! normalize the softsymbols before submitting to decoder
sav=sum(softbits)/40
s2av=sum(softbits*softbits)/40
@ -359,17 +355,17 @@ write(*,*) ip,id,nbadsync
max_iterations=5
max_dither=1
call ldpc_decode(lratio,decoded,max_iterations,niterations,max_dither,ndither)
nhashflag=0
if( niterations .ge. 0 ) then
imsg=0
do i=1,16
imsg=ishft(imsg,1)+iand(1,decoded(i))
imsg=ishft(imsg,1)+iand(1 , decoded(17-i))
enddo
nrxrpt=iand(imsg,63)
nrxhash=(imsg-nrxrpt)/64
write(*,*) niterations,decoded,nrxrpt,nrxhash,nhashes(nrxrpt)
if( nrxhash .eq. nhashes(nrxrpt) ) then
nhashflag=1
goto 999
@ -381,12 +377,13 @@ write(*,*) niterations,decoded,nrxrpt,nrxhash,nhashes(nrxrpt)
enddo ! slicer dither loop
enddo ! time-sync correlation-peak loop
enddo ! candidate loop
return
999 continue
msgreceived=' '
if( nhashflag.eq.1 ) then
nmessages=1
write(msgreceived,'(a1,a,1x,a,a1,1x,a4)') "<",trim(mycall), &
trim(partnercall),">",rpt(nrxrpt)
trim(hiscall),">",rpt(nrxrpt)
write(lines(nmessages),1020) nutc,nsnr,t0,nint(fest),msgreceived
1020 format(i6.6,i4,f5.1,i5,' & ',a22)