mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-03-21 03:28:59 -04:00
More progress on MSK40 decoder. THIS REVISION IS NOT INTENDED FOR USE ON THE AIR.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7145 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
6dcdee836e
commit
d9e4b7eede
@ -408,10 +408,14 @@ set (wsjt_FSRCS
|
||||
lib/move.f90
|
||||
lib/msk144d.f90
|
||||
lib/msk144d2.f90
|
||||
lib/msk40decodeframe.f90
|
||||
lib/msk144decodeframe.f90
|
||||
lib/msk40spd.f90
|
||||
lib/msk144spd.f90
|
||||
lib/msk40sync.f90
|
||||
lib/msk144sync.f90
|
||||
lib/msk144_decode.f90
|
||||
lib/msk40_freq_search.f90
|
||||
lib/msk144_freq_search.f90
|
||||
lib/mskrtd.f90
|
||||
lib/msk144sim.f90
|
||||
|
||||
52
lib/msk40_freq_search.f90
Normal file
52
lib/msk40_freq_search.f90
Normal file
@ -0,0 +1,52 @@
|
||||
subroutine msk40_freq_search(cdat,fc,if1,if2,delf,nframes,navmask,cb, &
|
||||
cdat2,xmax,bestf,cs,xccs)
|
||||
|
||||
parameter (NSPM=240,NZ=7*NSPM)
|
||||
complex cdat(NZ)
|
||||
complex cdat2(NZ)
|
||||
complex c(NSPM) !Coherently averaged complex data
|
||||
complex ct2(2*NSPM)
|
||||
complex cs(NSPM)
|
||||
complex cb(42) !Complex waveform for sync word
|
||||
complex cc(0:NSPM-1)
|
||||
real xcc(0:NSPM-1)
|
||||
real xccs(0:NSPM-1)
|
||||
integer navmask(nframes) !Tells which frames to average
|
||||
|
||||
navg=sum(navmask)
|
||||
n=nframes*NSPM
|
||||
fac=1.0/(48.0*sqrt(float(navg)))
|
||||
|
||||
do ifr=if1,if2 !Find freq that maximizes sync
|
||||
ferr=ifr*delf
|
||||
call tweak1(cdat,n,-(fc+ferr),cdat2)
|
||||
c=0
|
||||
do i=1,nframes
|
||||
ib=(i-1)*NSPM+1
|
||||
ie=ib+NSPM-1
|
||||
if( navmask(i) .eq. 1 ) c=c+cdat2(ib:ie)
|
||||
enddo
|
||||
|
||||
cc=0
|
||||
ct2(1:NSPM)=c
|
||||
ct2(NSPM+1:2*NSPM)=c
|
||||
|
||||
do ish=0,NSPM-1
|
||||
cc(ish)=dot_product(ct2(1+ish:42+ish),cb(1:42))
|
||||
enddo
|
||||
|
||||
xcc=abs(cc)
|
||||
xb=maxval(xcc)*fac
|
||||
if(xb.gt.xmax) then
|
||||
xmax=xb
|
||||
bestf=ferr
|
||||
cs=c
|
||||
xccs=xcc
|
||||
endif
|
||||
enddo
|
||||
|
||||
! write(71,3001) fc,delf,if1,if2,nframes,bestf,xmax
|
||||
!3001 format(2f8.3,3i5,2f8.3)
|
||||
|
||||
return
|
||||
end subroutine msk40_freq_search
|
||||
140
lib/msk40decodeframe.f90
Normal file
140
lib/msk40decodeframe.f90
Normal file
@ -0,0 +1,140 @@
|
||||
subroutine msk40decodeframe(c,mycall,hiscall,xsnr,msgreceived,nsuccess)
|
||||
! use timer_module, only: timer
|
||||
|
||||
parameter (NSPM=240)
|
||||
character*4 rpt(0:15)
|
||||
character*6 mycall,hiscall,mycall0,hiscall0
|
||||
character*22 hashmsg,msgreceived
|
||||
complex cb(42)
|
||||
complex cfac,cca
|
||||
complex c(NSPM)
|
||||
integer*1 cw(32)
|
||||
integer*1 decoded(16)
|
||||
integer s8r(8),hardbits(40)
|
||||
integer nhashes(0:15)
|
||||
real*8 dt, fs, pi, twopi
|
||||
real cbi(42),cbq(42)
|
||||
real pp(12)
|
||||
real softbits(40)
|
||||
real llr(32)
|
||||
logical first
|
||||
data first/.true./
|
||||
data s8r/1,0,1,1,0,0,0,1/
|
||||
data mycall0/'dummy'/,hiscall0/'dummy'/
|
||||
data rpt/"-03 ","+00 ","+03 ","+06 ","+10 ","+13 ","+16 ", &
|
||||
"R-03","R+00","R+03","R+06","R+10","R+13","R+16", &
|
||||
"RRR ","73 "/
|
||||
save first,cb,fs,nhashes,pi,twopi,dt,s8r,pp,rpt,mycall0,hiscall0
|
||||
|
||||
if(first) then
|
||||
! define half-sine pulse and raised-cosine edge window
|
||||
pi=4d0*datan(1d0)
|
||||
twopi=8d0*datan(1d0)
|
||||
fs=12000.0
|
||||
dt=1.0/fs
|
||||
|
||||
do i=1,12
|
||||
angle=(i-1)*pi/12.0
|
||||
pp(i)=sin(angle)
|
||||
enddo
|
||||
|
||||
! define the sync word waveforms
|
||||
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)
|
||||
cb=cmplx(cbi,cbq)
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
if(mycall.ne.mycall0 .or. hiscall.ne.hiscall0) then
|
||||
do i=0,15
|
||||
hashmsg=trim(mycall)//' '//trim(hiscall)//' '//rpt(i)
|
||||
call fmtmsg(hashmsg,iz)
|
||||
call hash(hashmsg,22,ihash)
|
||||
nhashes(i)=iand(ihash,4095)
|
||||
enddo
|
||||
mycall0=mycall
|
||||
hiscall0=hiscall
|
||||
endif
|
||||
|
||||
nsuccess=0
|
||||
msgreceived=' '
|
||||
|
||||
! Estimate carrier phase.
|
||||
cca=sum(c(1:1+41)*conjg(cb))
|
||||
phase0=atan2(imag(cca),real(cca))
|
||||
|
||||
! Remove phase error - want constellation rotated so that sample points lie on I/Q axes
|
||||
cfac=cmplx(cos(phase0),sin(phase0))
|
||||
c=c*conjg(cfac)
|
||||
|
||||
! matched filter -
|
||||
softbits(1)=sum(imag(c(1:6))*pp(7:12))+sum(imag(c(NSPM-5:NSPM))*pp(1:6))
|
||||
softbits(2)=sum(real(c(1:12))*pp)
|
||||
do i=2,20
|
||||
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
|
||||
|
||||
! sync word hard error weight is used as a discriminator for
|
||||
! frames that have reasonable probability of decoding
|
||||
hardbits=0
|
||||
do i=1,40
|
||||
if( softbits(i) .ge. 0.0 ) then
|
||||
hardbits(i)=1
|
||||
endif
|
||||
enddo
|
||||
nbadsync1=(8-sum( (2*hardbits(1:8)-1)*s8r ) )/2
|
||||
nbadsync=nbadsync1
|
||||
if( nbadsync .gt. 3 ) then
|
||||
return
|
||||
endif
|
||||
|
||||
! normalize the softsymbols before submitting to decoder
|
||||
sav=sum(softbits)/40
|
||||
s2av=sum(softbits*softbits)/40
|
||||
ssig=sqrt(s2av-sav*sav)
|
||||
softbits=softbits/ssig
|
||||
|
||||
sigma=0.75
|
||||
if(xsnr.lt.0.0) sigma=0.75-0.0875*xsnr
|
||||
llr(1:32)=softbits(9:40)
|
||||
llr=2.0*llr/(sigma*sigma)
|
||||
|
||||
max_iterations=5
|
||||
call bpdecode40(llr,max_iterations,decoded,niterations)
|
||||
|
||||
if( niterations .ge. 0.0 ) then
|
||||
call encode_msk40(decoded,cw)
|
||||
nhammd=0
|
||||
cord=0.0
|
||||
do i=1,32
|
||||
if( cw(i) .ne. hardbits(i+8) ) then
|
||||
nhammd=nhammd+1
|
||||
cord=cord+abs(softbits(i+8))
|
||||
endif
|
||||
enddo
|
||||
|
||||
imsg=0
|
||||
do i=1,16
|
||||
imsg=ishft(imsg,1)+iand(1,decoded(17-i))
|
||||
enddo
|
||||
nrxrpt=iand(imsg,15)
|
||||
nrxhash=(imsg-nrxrpt)/16
|
||||
!write(*,*) 'decodeframe ',nhammd,cord,nrxhash,nrxrpt,nhashes(nrxrpt)
|
||||
if(nhammd.le.5 .and. cord .lt. 1.7 .and. nrxhash.eq.nhashes(nrxrpt)) then
|
||||
nsuccess=1
|
||||
write(msgreceived,'(a1,a,1x,a,a1,1x,a4)') "<",trim(mycall), &
|
||||
trim(hiscall),">",rpt(nrxrpt)
|
||||
return
|
||||
endif
|
||||
endif
|
||||
|
||||
return
|
||||
end subroutine msk40decodeframe
|
||||
@ -1,9 +1,10 @@
|
||||
subroutine msk40spd(cbig,n,ntol,nsuccess,msgreceived,fc,fret,tret)
|
||||
subroutine msk40spd(cbig,n,ntol,mycall,hiscall,nsuccess,msgreceived,fc,fret,tret)
|
||||
! msk40 short-ping-decoder
|
||||
|
||||
use timer_module, only: timer
|
||||
|
||||
parameter (NSPM=240, MAXSTEPS=100, NFFT=NSPM, MAXCAND=5, NPATTERNS=6)
|
||||
parameter (NSPM=240, MAXSTEPS=150, NFFT=NSPM, MAXCAND=5, NPATTERNS=6)
|
||||
character*6 mycall,hiscall
|
||||
character*22 msgreceived
|
||||
complex cbig(n)
|
||||
complex cdat(3*NSPM) !Analytic signal
|
||||
@ -164,10 +165,10 @@ subroutine msk40spd(cbig,n,ntol,nsuccess,msgreceived,fc,fret,tret)
|
||||
endif
|
||||
cdat=cbig(ib:ie)
|
||||
fo=fc+ferrs(icand)
|
||||
xsnr=snrs(icand)
|
||||
do iav=1,NPATTERNS
|
||||
navmask=navpatterns(1:3,iav)
|
||||
call msk40sync(cdat,3,ntol0,deltaf,navmask,npeaks,fo,fest,npkloc,nsyncsuccess,c)
|
||||
|
||||
if( nsyncsuccess .eq. 0 ) cycle
|
||||
|
||||
do ipk=1,npeaks
|
||||
@ -176,7 +177,7 @@ subroutine msk40spd(cbig,n,ntol,nsuccess,msgreceived,fc,fret,tret)
|
||||
if( is.eq.2) ic0=max(1,ic0-1)
|
||||
if( is.eq.3) ic0=min(NSPM,ic0+1)
|
||||
ct=cshift(c,ic0-1)
|
||||
call msk40decodeframe(ct,msgreceived,ndecodesuccess)
|
||||
call msk40decodeframe(ct,mycall,hiscall,xsnr,msgreceived,ndecodesuccess)
|
||||
|
||||
if( ndecodesuccess .gt. 0 ) then
|
||||
tret=(nstart(icand)+NSPM/2)/fs
|
||||
|
||||
@ -10,7 +10,6 @@ subroutine msk40sync(cdat,nframes,ntol,delf,navmask,npeaks,fc,fest, &
|
||||
complex cs(NSPM,8)
|
||||
complex cb(42) !Complex waveform for sync word
|
||||
|
||||
! integer*8 count0,count1,clkfreq
|
||||
integer s8r(8)
|
||||
integer iloc(1)
|
||||
integer npklocs(npeaks)
|
||||
@ -25,10 +24,9 @@ subroutine msk40sync(cdat,nframes,ntol,delf,navmask,npeaks,fc,fest, &
|
||||
real pp(12) !Half-sine pulse shape
|
||||
logical first
|
||||
data first/.true./
|
||||
data s8r/0,1,0,0,1,1,1,0/
|
||||
save first,cb,fs,pi,twopi,dt,s8,pp
|
||||
data s8r/1,0,1,1,0,0,0,1/
|
||||
save first,cb,fs,pi,twopi,dt,s8r,pp
|
||||
|
||||
! call system_clock(count0,clkfreq)
|
||||
if(first) then
|
||||
pi=4.0*atan(1.0)
|
||||
twopi=8.0*atan(1.0)
|
||||
@ -98,16 +96,8 @@ subroutine msk40sync(cdat,nframes,ntol,delf,navmask,npeaks,fc,fest, &
|
||||
xcc(max(0,ic2-7):min(NSPM-1,ic2+7))=0.0
|
||||
enddo
|
||||
|
||||
if( xmax .lt. 0.7 ) then
|
||||
nsuccess=0
|
||||
else
|
||||
nsuccess=1
|
||||
endif
|
||||
|
||||
! call system_clock(count1,clkfreq)
|
||||
! t=float(count1-count0)/clkfreq
|
||||
! write(72,3001) nfreqs,OMP_GET_MAX_THREADS(),nthreads,t
|
||||
!3001 format(3i6,f8.3)
|
||||
nsuccess=0
|
||||
if( xmax .ge. 1.3 ) nsuccess=1
|
||||
|
||||
return
|
||||
end subroutine msk40sync
|
||||
|
||||
@ -13,6 +13,8 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,line)
|
||||
character*22 msgreceived !Decoded message
|
||||
character*22 msglast !!! temporary - used for dupechecking
|
||||
character*80 line !Formatted line with UTC dB T Freq Msg
|
||||
!##### TEMPORARY
|
||||
character*6 mycall,hiscall
|
||||
|
||||
complex cdat(NFFT1) !Analytic signal
|
||||
complex c(NSPM) !Coherently averaged complex data
|
||||
@ -34,6 +36,9 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,line)
|
||||
1,1,1,1,1,0,0,0, &
|
||||
1,1,1,1,1,1,1,0/
|
||||
data xmc/2.0,4.5,2.5,3.5/ !Used to label decode with time at center of averaging mask
|
||||
!###### TEMPORARY
|
||||
data mycall/'K9AN'/
|
||||
data hiscall/'K1JT'/
|
||||
|
||||
save first,tsec0,nutc00,pnoise,nsnrlast,msglast,cdat
|
||||
|
||||
@ -85,6 +90,13 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,line)
|
||||
! 3 frames along with 2- and 3-frame averages.
|
||||
np=8*NSPM
|
||||
call msk144spd(cdat,np,ntol,nsuccess,msgreceived,fc,fest,tdec)
|
||||
|
||||
!############################################################
|
||||
!##### hardwired for testing - need to bring in Sh box status
|
||||
if( nsuccess .eq. 0 .and. .false. ) then
|
||||
call msk40spd(cdat,np,ntol,mycall,hiscall,nsuccess,msgreceived,fc,fest,tdec)
|
||||
endif
|
||||
|
||||
if( nsuccess .eq. 1 ) then
|
||||
tdec=tsec+tdec
|
||||
decsym=' & '
|
||||
@ -125,6 +137,7 @@ subroutine mskrtd(id2,nutc0,tsec,ntol,nrxfreq,ndepth,line)
|
||||
enddo !Peak loop
|
||||
enddo
|
||||
|
||||
|
||||
msgreceived=' '
|
||||
|
||||
! no decode - update noise level used for calculating displayed snr.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user