mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-21 19:55:20 -05:00
New short ping decoding algorithm for msk144 realtime decoder. Not yet enabled.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7108 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
9831fb9cfc
commit
3df371f11b
@ -87,7 +87,7 @@ subroutine msk144decodeframe(c,msgreceived,nsuccess)
|
||||
ssig=sqrt(s2av-sav*sav)
|
||||
softbits=softbits/ssig
|
||||
|
||||
sigma=0.70
|
||||
sigma=0.72
|
||||
llr(1:48)=softbits(9:9+47)
|
||||
llr(49:128)=softbits(65:65+80-1)
|
||||
llr=2.0*llr/(sigma*sigma)
|
||||
|
||||
@ -1,47 +1,43 @@
|
||||
subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
|
||||
subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fc,fret,tret)
|
||||
! msk144 short-ping-decoder
|
||||
|
||||
use timer_module, only: timer
|
||||
|
||||
parameter (NSPM=864, NPTS=3*NSPM, MAXSTEPS=1700, NFFT=NSPM, MAXCAND=5)
|
||||
parameter (NSPM=864, MAXSTEPS=100, NFFT=NSPM, MAXCAND=5, NPATTERNS=6)
|
||||
character*22 msgreceived
|
||||
complex cbig(n)
|
||||
complex cdat(NPTS) !Analytic signal
|
||||
complex cdat2(NPTS)
|
||||
complex cdat(3*NSPM) !Analytic signal
|
||||
complex c(NSPM)
|
||||
complex ct(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),s8r(8)
|
||||
integer, dimension(1) :: iloc
|
||||
integer indices(MAXSTEPS)
|
||||
integer ipeaks(10)
|
||||
integer npkloc(10)
|
||||
integer navpatterns(3,NPATTERNS)
|
||||
integer navmask(3)
|
||||
integer nstart(MAXCAND)
|
||||
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 dd(NPTS)
|
||||
real ferrs(MAXCAND)
|
||||
real pp(12) !Half-sine pulse shape
|
||||
real snrs(MAXCAND)
|
||||
real times(MAXCAND)
|
||||
real tonespec(NFFT)
|
||||
real tpat(NPATTERNS)
|
||||
real*8 dt, df, fs, pi, twopi
|
||||
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,nmatchedfilter
|
||||
data navpatterns/ &
|
||||
0,1,0, &
|
||||
1,0,0, &
|
||||
0,0,1, &
|
||||
1,1,0, &
|
||||
0,1,1, &
|
||||
1,1,1/
|
||||
data tpat/1.5,0.5,2.5,1.0,2.0,1.5/
|
||||
|
||||
save df,first,fs,pi,twopi,dt,tframe,rcw
|
||||
|
||||
if(first) then
|
||||
nmatchedfilter=1
|
||||
@ -51,40 +47,19 @@ subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
|
||||
fs=12000.0
|
||||
dt=1.0/fs
|
||||
df=fs/NFFT
|
||||
tframe=NSPM/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)
|
||||
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
|
||||
|
||||
|
||||
! fill the detmet, detferr arrays
|
||||
nstep=(n-NPTS)/216 ! 72ms/4=18ms steps
|
||||
nstep=(n-NSPM)/216 ! 72ms/4=18ms steps
|
||||
detmet=0
|
||||
detmet2=0
|
||||
detfer=-999.99
|
||||
@ -148,15 +123,13 @@ subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
|
||||
do ip=1,MAXCAND ! Find candidates
|
||||
iloc=maxloc(detmet(1:nstep))
|
||||
il=iloc(1)
|
||||
! if( (detmet(il) .lt. 4.0) ) exit
|
||||
if( (detmet(il) .lt. 3.0) ) exit
|
||||
if( abs(detfer(il)) .le. ntol ) then
|
||||
ndet=ndet+1
|
||||
times(ndet)=((il-1)*216+NSPM/2)*dt
|
||||
nstart(ndet)=1+(il-1)*216+1
|
||||
ferrs(ndet)=detfer(il)
|
||||
snrs(ndet)=12.0*log10(detmet(il))/2-9.0
|
||||
endif
|
||||
! detmet(max(1,il-1):min(nstep,il+1))=0.0
|
||||
detmet(il)=0.0
|
||||
enddo
|
||||
|
||||
@ -167,146 +140,53 @@ subroutine msk144spd(cbig,n,ntol,nsuccess,msgreceived,fret,snrret,tret)
|
||||
if( (detmet2(il) .lt. 12.0) ) exit
|
||||
if( abs(detfer(il)) .le. ntol ) then
|
||||
ndet=ndet+1
|
||||
times(ndet)=((il-1)*216+NSPM/2)*dt
|
||||
nstart(ndet)=1+(il-1)*216+1
|
||||
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
|
||||
|
||||
nsuccess=0
|
||||
msgreceived=' '
|
||||
do ip=1,ndet ! Try to sync/demod/decode each candidate.
|
||||
imid=times(ip)*fs
|
||||
if( imid .lt. NPTS/2 ) imid=NPTS/2
|
||||
if( imid .gt. n-NPTS/2 ) imid=n-NPTS/2
|
||||
cdat=cbig(imid-NPTS/2+1:imid+NPTS/2)
|
||||
ferr=ferrs(ip)
|
||||
npeaks=2
|
||||
ntol0=8
|
||||
ndf=2
|
||||
do icand=1,ndet ! Try to sync/demod/decode each candidate.
|
||||
ib=max(1,nstart(icand)-NSPM)
|
||||
ie=ib-1+3*NSPM
|
||||
if( ie .gt. n ) then
|
||||
ie=n
|
||||
ib=ie-3*NSPM+1
|
||||
endif
|
||||
cdat=cbig(ib:ie)
|
||||
fo=fc+ferrs(icand)
|
||||
do iav=1,NPATTERNS
|
||||
navmask=navpatterns(1:3,iav)
|
||||
call msk144sync(cdat,3,ntol0,ndf,navmask,npeaks,fo,fest,npkloc,nsyncsuccess,c)
|
||||
|
||||
! remove coarse freq error - should now be within a few Hz
|
||||
call tweak1(cdat,NPTS,-(1500+ferr),cdat)
|
||||
|
||||
! 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)
|
||||
cmax=maxval(abs(cc))
|
||||
|
||||
! Find 6 largest peaks
|
||||
do ipk=1, 6
|
||||
iloc=maxloc(abs(cc))
|
||||
ic1=iloc(1)
|
||||
iloc=maxloc(dd)
|
||||
ic2=iloc(1)
|
||||
ipeaks(ipk)=ic2
|
||||
dd(max(1,ic2-7):min(NPTS-56*6-41,ic2+7))=0.0
|
||||
enddo
|
||||
if( nsyncsuccess .eq. 0 ) cycle
|
||||
|
||||
do ipk=1,4
|
||||
do ipk=1,npeaks
|
||||
do is=1,3
|
||||
ic0=npkloc(ipk)
|
||||
if( is.eq.2) ic0=max(1,ic0-1)
|
||||
if( is.eq.3) ic0=min(NSPM,ic0+1)
|
||||
ct=cshift(c,ic0-1)
|
||||
call msk144decodeframe(ct,msgreceived,ndecodesuccess)
|
||||
|
||||
! 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
|
||||
if( ndecodesuccess .gt. 0 ) then
|
||||
tret=(nstart(icand)+NSPM/2)/fs
|
||||
fret=fest
|
||||
!write(*,*) icand, iav, ipk, is, tret, fret, msgreceived
|
||||
nsuccess=1
|
||||
return
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
iloc=maxloc(abs(bb))
|
||||
ibb=iloc(1)
|
||||
bba=abs(bb(ibb))
|
||||
bbp=atan2(-imag(bb(ibb)),-real(bb(ibb)))/(2*twopi*6*dt)
|
||||
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+864
|
||||
|
||||
! Estimate fine frequency error.
|
||||
! Should a larger separation be used when frames are averaged?
|
||||
cca=sum(cdat(ic:ic+41)*conjg(cb))
|
||||
if( ic+56*6+41 .le. NPTS ) then
|
||||
ccb=sum(cdat(ic+56*6:ic+56*6+41)*conjg(cb))
|
||||
cfac=ccb*conjg(cca)
|
||||
ferr2=atan2(imag(cfac),real(cfac))/(twopi*56*6*dt)
|
||||
else
|
||||
ccb=sum(cdat(ic-88*6:ic-88*6+41)*conjg(cb))
|
||||
cfac=cca*conjg(ccb)
|
||||
ferr2=atan2(imag(cfac),real(cfac))/(twopi*88*6*dt)
|
||||
endif
|
||||
|
||||
! Final estimate of the carrier frequency - returned to the calling program
|
||||
fest=1500+ferr+ferr2
|
||||
|
||||
do idf=0,4 ! frequency jitter
|
||||
if( idf .eq. 0 ) then
|
||||
deltaf=0.0
|
||||
elseif( mod(idf,2) .eq. 0 ) then
|
||||
deltaf=idf
|
||||
else
|
||||
deltaf=-(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=1,8 ! Hopefully we can eliminate some of these after looking at more examples
|
||||
if( iav .eq. 1 ) then
|
||||
c=cdat2(NSPM+1:2*NSPM)
|
||||
elseif( iav .eq. 2 ) then
|
||||
c=cdat2(NSPM-431:NSPM+432)
|
||||
c=cshift(c,-432)
|
||||
elseif( iav .eq. 3 ) then
|
||||
c=cdat2(2*NSPM-431:2*NSPM+432)
|
||||
c=cshift(c,-432)
|
||||
elseif( iav .eq. 4 ) then
|
||||
c=cdat2(1:NSPM)
|
||||
elseif( iav .eq. 5 ) then
|
||||
c=cdat2(2*NSPM+1:NPTS)
|
||||
elseif( iav .eq. 6 ) then
|
||||
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)
|
||||
elseif( iav .eq. 7 ) then
|
||||
c=cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
|
||||
elseif( iav .eq. 8 ) then
|
||||
c=cdat2(1:NSPM)+cdat2(NSPM+1:2*NSPM)+cdat2(2*NSPM+1:NPTS)
|
||||
endif
|
||||
|
||||
call msk144decodeframe(c,msgreceived,nsuccess)
|
||||
if( nsuccess .eq. 1 ) then
|
||||
fret=1500+ferrs(ip)
|
||||
snrret=snrs(ip)
|
||||
tret=times(ip)
|
||||
return
|
||||
endif
|
||||
|
||||
enddo ! frame averaging loop
|
||||
enddo ! frequency dithering loop
|
||||
enddo ! sample-time dither loop
|
||||
enddo ! peak loop
|
||||
enddo
|
||||
enddo ! candidate loop
|
||||
|
||||
return
|
||||
end subroutine msk144spd
|
||||
|
||||
@ -1,8 +1,8 @@
|
||||
subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
|
||||
subroutine msk144sync(cdat,nframes,ntol,ndf,navmask,npeaks,fc,fest,npklocs,nsuccess,c)
|
||||
|
||||
parameter (NSPM=864)
|
||||
complex cdat(n)
|
||||
complex cdat2(n)
|
||||
complex cdat(NSPM*nframes)
|
||||
complex cdat2(NSPM*nframes)
|
||||
complex c(NSPM) !Coherently averaged complex data
|
||||
complex ct2(2*NSPM)
|
||||
complex cs(NSPM)
|
||||
@ -12,7 +12,7 @@ subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
|
||||
integer s8(8)
|
||||
integer iloc(1)
|
||||
integer npklocs(npeaks)
|
||||
integer navmask(8) ! defines which frames to average
|
||||
integer navmask(nframes) ! defines which frames to average
|
||||
|
||||
real cbi(42),cbq(42)
|
||||
real pkamps(npeaks)
|
||||
@ -54,11 +54,12 @@ subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
|
||||
navg=sum(navmask)
|
||||
xmax=0.0
|
||||
bestf=0.0
|
||||
n=nframes*NSPM
|
||||
do ifr=-ntol,ntol,ndf !Find freq that maximizes sync
|
||||
ferr=ifr
|
||||
call tweak1(cdat,n,-(1500+ferr),cdat2)
|
||||
call tweak1(cdat,n,-(fc+ferr),cdat2)
|
||||
c=0
|
||||
do i=1,8
|
||||
do i=1,nframes
|
||||
ib=(i-1)*NSPM+1
|
||||
ie=ib+NSPM-1
|
||||
if( navmask(i) .eq. 1 ) then
|
||||
@ -83,7 +84,7 @@ subroutine msk144sync(cdat,n,ntol,ndf,navmask,npeaks,fest,npklocs,nsuccess,c)
|
||||
endif
|
||||
enddo
|
||||
|
||||
fest=1500+bestf
|
||||
fest=fc+bestf
|
||||
c=cs
|
||||
xcc=xccs
|
||||
|
||||
|
||||
@ -78,6 +78,8 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
pnoise=-1.0
|
||||
endif
|
||||
|
||||
fc=1500.0 !!! This will eventually come from the Rx Freq GUI box.
|
||||
|
||||
!!! Dupe checking should probaby be moved to mainwindow.cpp
|
||||
if( nutc00 .ne. nutc0 ) then ! reset dupe checker
|
||||
msglast=' '
|
||||
@ -109,8 +111,10 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
enddo
|
||||
pavg=sum(pow)/7.0
|
||||
|
||||
np=7*NSPM
|
||||
call msk144spd(cdat,np,ntol,nsuccess,msgreceived,fest,snr,tdec)
|
||||
np=8*NSPM
|
||||
|
||||
call msk144spd(cdat,np,ntol,nsuccess,msgreceived,fc,fest,tdec)
|
||||
|
||||
if( nsuccess .eq. 1 ) then
|
||||
tdec=tsec+tdec
|
||||
decsym=' & '
|
||||
@ -120,10 +124,9 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
do iavg=1,NPATTERNS
|
||||
iavmask=iavpatterns(1:8,iavg)
|
||||
navg=sum(iavmask)
|
||||
! ndf=nint(7.0/navg) + 1
|
||||
ndf=nint(7.0/navg)
|
||||
npeaks=2
|
||||
call msk144sync(cdat(1:7*NSPM),7*864,ntol,ndf,iavmask,npeaks,fest,npkloc,nsyncsuccess,c)
|
||||
call msk144sync(cdat(1:8*NSPM),8,ntol,ndf,iavmask,npeaks,fc,fest,npkloc,nsyncsuccess,c)
|
||||
if( nsyncsuccess .eq. 0 ) cycle
|
||||
|
||||
do ipk=1,npeaks
|
||||
@ -146,7 +149,7 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
|
||||
msgreceived=' '
|
||||
|
||||
! no decode - update noise level estimate used for calculating displayed snr.
|
||||
! no decode - update noise level used for calculating displayed snr.
|
||||
if( pnoise .lt. 0 ) then ! initialize noise level
|
||||
pnoise=pavg
|
||||
elseif( pavg .gt. pnoise ) then ! noise level is slow to rise
|
||||
@ -154,11 +157,12 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
elseif( pavg .lt. pnoise ) then ! and quick to fall
|
||||
pnoise=pavg
|
||||
endif
|
||||
|
||||
return
|
||||
|
||||
999 continue
|
||||
|
||||
! successful decode - estimate snr
|
||||
! successful decode - estimate snr !!! noise estimate needs work
|
||||
if( pnoise .gt. 0.0 ) then
|
||||
snr0=10.0*log10(pmax/pnoise-1.0)
|
||||
else
|
||||
@ -177,3 +181,4 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,line)
|
||||
1020 format(i6.6,i4,f5.1,i5,a3,a22,a1)
|
||||
return
|
||||
end subroutine mskrtd
|
||||
|
||||
|
||||
@ -5,6 +5,7 @@ subroutine tweak1(ca,jz,f0,cb)
|
||||
complex ca(jz),cb(jz)
|
||||
real*8 twopi
|
||||
complex*16 w,wstep
|
||||
complex w4
|
||||
data twopi/0.d0/
|
||||
save twopi
|
||||
|
||||
|
||||
@ -2964,7 +2964,7 @@ void MainWindow::guiUpdate()
|
||||
|
||||
//Once per second:
|
||||
if(nsec != m_sec0) {
|
||||
qDebug() << m_config.contestMode() << m_config.realTimeDecode();
|
||||
// qDebug() << m_config.contestMode() << m_config.realTimeDecode();
|
||||
g_single_decode=m_config.single_decode();
|
||||
if(m_auto and m_mode=="Echo" and m_bEchoTxOK) {
|
||||
progressBar.setMaximum(6);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user