WSJT-X/lib/msk144signalquality.f90

228 lines
6.2 KiB
Fortran
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subroutine msk144signalquality(cframe,snr,freq,t0,softbits,msg,dxcall,nbiterrors,eyeopening,trained,pcoeffs)
character*22 msg,msgsent
character*12 dxcall
character*12 training_dxcall
character*12 trained_dxcall
character*6 mygrid
character*40 pcoeff_filename
character*8 date
character*10 time
character*5 zone
complex cframe(864)
complex cross(864)
complex cross_avg(864)
complex canalytic(1024)
complex cmodel(1024)
integer i4tone(144)
integer hardbits(144)
integer msgbits(144)
integer values(8)
logical*1 bcontest
logical*1 first
logical*1 currently_training
logical*1 trained
logical*1 msg_has_dxcall
logical*1 is_training_frame
real abscross_avg(864)
real softbits(144)
real softav(144)
real waveform(0:863)
real d(1024)
real phase(864)
real twopi,freq,phi,dphi0,dphi1,dphi
real*8 x(145),y(145),pp(145),sigmay(145),a(5),chisqr,pcoeffs(5)
data first/.true./
save cross_avg,abscross_avg,wt_avg,first,currently_training, &
navg,softav,tlast,training_dxcall,trained_dxcall
if (first) then
navg=0
cross=cmplx(0.0,0.0)
cross_avg=cmplx(0.0,0.0)
wt_avg=0.0
tlast=0.0
trained_dxcall(1:12)=' '
training_dxcall(1:12)=' '
trained=.false.
currently_training=.false.
pcoeffs(1:5)=0.0
first=.false.
endif
if( (trained .and. (dxcall .ne. trained_dxcall)) .or. &
(currently_training .and. (dxcall .ne. training_dxcall)) .or. &
(navg .gt. 10 )) then !reset and retrain
navg=0
cross=cmplx(0.0,0.0)
cross_avg=cmplx(0.0,0.0)
wt_avg=0.0
tlast=0.0
trained_dxcall(1:12)=' '
trained=.false.
currently_training=.false.
training_dxcall(1:12)=' '
trained_dxcall(1:12)=' '
pcoeffs(1:5)=0.0
write(*,*) 'reset to untrained state '
endif
indx_dxcall=index(msg,trim(dxcall))
msg_has_dxcall = indx_dxcall .ge. 4
if( msg_has_dxcall .and. (.not. trained) .and. .not. currently_training ) then
currently_training=.true.
training_dxcall=trim(dxcall)
trained_dxcall(1:12)=' '
pcoeffs(1:5)=0.0
write(*,*) 'start training on call ',training_dxcall
endif
if( msg_has_dxcall .and. currently_training ) then
trained=.false. ! just to be sure
trained_dxcall(1:12)=' '
training_dxcall=dxcall
pcoeffs(1:5)=0.0
endif
! use decoded message to figure out how many bit errors in the frame
do i=1, 144
hardbits(i)=0
if(softbits(i) .gt. 0 ) hardbits(i)=1
enddo
! generate tones from decoded message
mygrid="EN50"
ichk=0
bcontest=.false.
call genmsk144(msg,mygrid,ichk,bcontest,msgsent,i4tone,itype)
! reconstruct message bits from tones
msgbits(1)=0
do i=1,143
if( i4tone(i) .eq. 0 ) then
if( mod(i,2) .eq. 1 ) then
msgbits(i+1)=msgbits(i)
else
msgbits(i+1)=mod(msgbits(i)+1,2)
endif
else
if( mod(i,2) .eq. 1 ) then
msgbits(i+1)=mod(msgbits(i)+1,2)
else
msgbits(i+1)=msgbits(i)
endif
endif
enddo
nbiterrors=0
do i=1,144
if( hardbits(i) .ne. msgbits(i) ) nbiterrors=nbiterrors+1
enddo
nplus=0
nminus=0
eyetop=1
eyebot=-1
do i=1,144
if( msgbits(i) .eq. 1 ) then
if( softbits(i) .lt. eyetop ) eyetop=softbits(i)
else
if( softbits(i) .gt. eyebot ) eyebot=softbits(i)
endif
enddo
eyeopening=eyetop-eyebot
is_training_frame = &
(snr.gt.5.0 .and.(nbiterrors.lt.7)) .and. &
(abs(t0-tlast) .gt. 0.072) .and. &
msg_has_dxcall
if( currently_training .and. is_training_frame ) then
twopi=8.0*atan(1.0)
nsym=144
if( i4tone(41) .lt. 0 ) nsym=40
dphi0=twopi*(freq-500)/12000.0
dphi1=twopi*(freq+500)/12000.0
phi=-twopi/8
indx=0
do i=1,nsym
if( i4tone(i) .eq. 0 ) then
dphi=dphi0
else
dphi=dphi1
endif
do j=1,6
waveform(indx)=cos(phi);
indx=indx+1
phi=mod(phi+dphi,twopi)
enddo
enddo
! convert the passband waveform to complex baseband
npts=864
nfft=1024
d=0
d(1:864)=waveform(0:863)
a=0
call analytic(d,npts,nfft,canalytic,a,.false.) ! don't equalize the model
call tweak1(canalytic,nfft,-freq,cmodel)
call four2a(cframe(1:864),864,1,-1,1)
call four2a(cmodel(1:864),864,1,-1,1)
! Cross spectra from different messages can be averaged
! as long as all messages originate from dxcall.
cross=cmodel(1:864)*conjg(cframe)/1000.0
cross=cshift(cross,864/2)
cross_avg=cross_avg+10**(snr/20.0)*cross
wt_avg=wt_avg+10**(snr/20.0)
navg=navg+1
tlast=t0
phase=atan2(imag(cross_avg),real(cross_avg))
df=12000.0/864.0
nm=145
do i=1,145
x(i)=(i-73)*df/1000.0
enddo
y=phase((864/2-nm/2):(864/2+nm/2))
sigmay=wt_avg/abs(cross_avg((864/2-nm/2):(864/2+nm/2)))
mode=1
npts=145
nterms=5
call polyfit(x,y,sigmay,npts,nterms,mode,a,chisqr)
pp=a(1)+x*(a(2)+x*(a(3)+x*(a(4)+x*a(5))))
rmsdiff=sum( (pp-phase((864/2-nm/2):(864/2+nm/2)))**2 )/145.0
write(*,*) 'training ',navg,sqrt(chisqr),rmsdiff
if( (sqrt(chisqr).lt.1.5) .and. (rmsdiff.lt.1.1) .and. (navg.ge.5) ) then
open(18,file='phasefit.dat',status='unknown')
do i=1, 145
write(18,*) x(i),pp(i),y(i),sigmay(i)
enddo
close(18)
open(19,file='cframe.dat',status='unknown')
do i=1,864
write(19,*) i,real(cframe(i)),imag(cframe(i))
enddo
close(19)
pcoeffs=a
trained_dxcall=dxcall
training_dxcall(1:12)=' '
currently_training=.false.
trained=.true.
call date_and_time(date,time,zone,values)
write(pcoeff_filename,'(i2.2,i2.2,i2.2,"_",i2.2,i2.2,i2.2)') &
values(1)-2000,values(2),values(3),values(5),values(6),values(7)
pcoeff_filename=trim(trained_dxcall)//"_"//pcoeff_filename//".pcoeff"
write(*,*) pcoeff_filename
open(17,file=pcoeff_filename,status='new')
write(17,'(i4,2f10.2,5f10.4)') navg,sqrt(chisqr),rmsdiff,a(1),a(2),a(3),a(4),a(5)
close(17)
endif
endif
return
end subroutine msk144signalquality