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Much reworking of Q65 decoder. Have temporarily enabled all types of decoding passes.

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This commit is contained in:
Joe Taylor 2020-12-28 15:27:10 -05:00
parent 30ab29d9e3
commit 62074ab58f
6 changed files with 124 additions and 140 deletions
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6
CMakeLists.txt
View File

@ -325,7 +325,7 @@ set (wsjt_FSRCS
lib/options.f90
lib/packjt.f90
lib/77bit/packjt77.f90
lib/q65.f90
lib/qra/q65/q65.f90
lib/q65_decode.f90
lib/readwav.f90
lib/timer_C_wrapper.f90
@ -496,8 +496,8 @@ set (wsjt_FSRCS
lib/polyfit.f90
lib/prog_args.f90
lib/ps4.f90
lib/q65_avg.f90
lib/q65_sync.f90
lib/qra/q65/q65_avg.f90
lib/qra/q65/q65_sync.f90
lib/qra/q65/q65_ap.f90
lib/qra/q65/q65_loops.f90
lib/qra/q65/q65_set_list.f90

45
lib/q65_decode.f90
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@ -42,7 +42,7 @@ contains
use timer_module, only: timer
use packjt77
use, intrinsic :: iso_c_binding
use q65
use q65 !Shared variables
parameter (NMAX=300*12000) !Max TRperiod is 300 s
class(q65_decoder), intent(inout) :: this
@ -89,44 +89,51 @@ contains
baud=12000.0/nsps
df1=12000.0/nfft1
this%callback => callback
if(nutc.eq.-999) print*,lapdx,nfa,nfb,nfqso !Silence warning
nFadingModel=1
call q65_set_list(mycall,hiscall,hisgrid,codewords,ncw)
! Set up the codewords for full-AP list decoding
call q65_set_list(mycall,hiscall,hisgrid,codewords,ncw)
dgen=0
call q65_enc(dgen,codewords) !Initialize Q65
call q65_enc(dgen,codewords) !Initialize the Q65 codec
call timer('sync_q65',0)
call q65_sync(nutc,iwave,ntrperiod,mode65,codewords,ncw,nsps, &
nfqso,ntol,ndepth,lclearave,emedelay,xdt,f0,snr1,width,dat4,snr2,id1)
call q65_sync(nutc,iwave,ntrperiod,mode65,codewords,ncw,nsps, &
nfqso,ntol,ndepth,lclearave,emedelay,xdt,f0,snr1,width,dat4, &
snr2,id1)
call timer('sync_q65',1)
if(id1.eq.1 .or. id1.ge.12) then
xdt1=xdt
xdt1=xdt !We have a list-decode result
f1=f0
go to 100
! go to 100 !### TEMPORARILY REMOVED ###
endif
if(snr1.lt.2.8) then
xdt1=0.
xdt1=0. !No reliable sync, abandon decoding attempt
f1=0.
go to 100
endif
jpk0=(xdt+1.0)*6000 !### Is this OK?
if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !###
jpk0=(xdt+1.0)*6000 !Index of nominal start of signal
if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !For shortest sequences
if(jpk0.lt.0) jpk0=0
fac=1.0/32767.0
dd=fac*iwave(1:npts)
nmode=65
call ana64(dd,npts,c00)
call ana64(dd,npts,c00) !Convert to complex c00() at 6000 Sa/s
! Generate ap symbols as in FT8
call ft8apset(mycall,hiscall,ncontest,apsym0,aph10)
where(apsym0.eq.-1) apsym0=0
! Main decoding loop starts here
npasses=2
if(nQSOprogress.eq.5) npasses=3
if(lapcqonly) npasses=1
iaptype=0
do ipass=0,npasses
apmask=0
apmask=0 !Try first with no AP information
apsymbols=0
if(ipass.ge.1) then
! Subsequent passes use AP information appropiate for nQSOprogress
call q65_ap(nQSOprogress,ipass,ncontest,lapcqonly,iaptype, &
apsym0,apmask1,apsymbols1)
write(c78,1050) apmask1
@ -144,17 +151,21 @@ contains
enddo
endif
endif
call timer('q65loops',0)
call q65_loops(c00,npts/2,nsps/2,nmode,mode65,nsubmode, &
call q65_loops(c00,npts/2,nsps/2,mode65,nsubmode, &
nFadingModel,ndepth,jpk0,xdt,f0,width,iaptype,apmask,apsymbols, &
xdt1,f1,snr2,dat4,id2)
call timer('q65loops',1)
! snr2=snr2 + db(6912.0/nsps)
if(id2.gt.0) exit
if(id2.gt.0) exit !Exit main loop after a successful decode
enddo
! No single-transmission decode.
! if(iand(ndepth,16).eq.16) call q65_avg2
100 decoded=' '
if(id1.gt.0 .or. id2.gt.0) then
! Unpack decoded message for display to user
idec=id1+id2
write(c77,1000) dat4(1:12),dat4(13)/2
1000 format(12b6.6,b5.5)

1
lib/q65.f90 → lib/qra/q65/q65.f90
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@ -1,6 +1,7 @@
module q65
parameter (MAXAVE=64)
parameter (PLOG_MIN=-240.0) !List decoding threshold
integer nsave,nlist,LL0
integer iutc(MAXAVE)
integer iseq(MAXAVE)

42
lib/q65_avg.f90 → lib/qra/q65/q65_avg.f90
View File

@ -6,7 +6,6 @@ subroutine q65_avg(nutc,ntrperiod,mode_q65,LL,nfqso,ntol,lclearave, &
use q65
use packjt77
parameter (PLOG_MIN=-240.0) !List decoding threshold
character*37 avemsg
character*1 csync,cused(MAXAVE)
character*6 cutc
@ -69,7 +68,6 @@ subroutine q65_avg(nutc,ntrperiod,mode_q65,LL,nfqso,ntol,lclearave, &
10 continue
!10 if(nsave.lt.2) go to 900
snr1sum=0.
xdtsum=0.
fsum=0.
@ -107,7 +105,7 @@ subroutine q65_avg(nutc,ntrperiod,mode_q65,LL,nfqso,ntol,lclearave, &
fave=fsum/nsum
endif
! Write parameters for display to User in the Message Averaging window.
! Write parameters for display to User in the Message Averaging (F7) window.
do i=1,nsave
if(ntrperiod.le.30) write(14,1000) cused(i),iutc(i),snr1save(i), &
xdtsave(i),f0save(i)
@ -118,56 +116,30 @@ subroutine q65_avg(nutc,ntrperiod,mode_q65,LL,nfqso,ntol,lclearave, &
enddo
! if(nsum.lt.2) go to 900 !Must have at least 2
! Find rms scatter of DT and f0 values
sqt=0.
sqf=0.
do j=1,MAXAVE
i=iused(j)
if(i.eq.0) exit
csync='*'
sqt=sqt + (xdtsave(i)-dtave)**2
sqf=sqf + (f0save(i)-fave)**2
enddo
rmst=0.
rmsf=0.
if(nsum.ge.2) then
rmst=sqrt(sqt/(nsum-1))
rmsf=sqrt(sqf/(nsum-1))
endif
s3avg=s3avg/nsum
nFadingModel=1
do ibw=ibwa,ibwb
b90=1.72**ibw
call q65_intrinsics_ff(s3avg,nsubmode,b90/baud,nFadingModel,s3prob)
call q65_dec_fullaplist(s3avg,s3prob,codewords,ncw,esnodb,dat4,plog,irc)
b90ts=b90/baud
call q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,avemsg)
if(irc.ge.0 .and. plog.ge.PLOG_MIN) then
snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
id1=1 !###
write(c77,3050) dat4(1:12),dat4(13)/2
3050 format(12b6.6,b5.5)
call unpack77(c77,0,avemsg,unpk77_success) !Unpack to get msgsent
open(55,file='fort.55',status='unknown',position='append')
write(55,3055) nutc,ibw,xdt,f0,85.0*base,ccfmax,snr2,plog, &
irc,trim(avemsg)
3055 format(i6,i3,6f8.2,i5,2x,a)
close(55)
print*,'F ',avemsg
print*,'B dec1 ',ibw,irc,avemsg
exit
endif
enddo
APmask=0
APsymbols=0
read(41) LNZ,s3avg
do ibw=ibwa,ibwb
b90=1.72**ibw
call q65_intrinsics_ff(s3avg,nsubmode,b90/baud,nFadingModel,s3prob)
call q65_dec(s3avg,s3prob,APmask,APsymbols,esnodb,dat4,irc)
print*,'G',ibw,irc,sum(s3avg)
b90ts=b90/baud
call q65_dec2(s3,nsubmode,b90ts,esnodb,irc,dat4,avemsg)
if(irc.ge.0) then
id2=iaptype+2
print*,'C dec2 ',ibw,irc,avemsg
exit
endif
enddo ! ibw (b90 loop)

52
lib/qra/q65/q65_loops.f90
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@ -1,4 +1,4 @@
subroutine q65_loops(c00,npts2,nsps,mode,mode_q65,nsubmode,nFadingModel, &
subroutine q65_loops(c00,npts2,nsps,mode_q65,nsubmode,nFadingModel, &
ndepth,jpk0,xdt0,f0,width,iaptype,APmask,APsymbols,xdt1,f1,snr2,dat4,id2)
use packjt77
@ -7,8 +7,7 @@ subroutine q65_loops(c00,npts2,nsps,mode,mode_q65,nsubmode,nFadingModel, &
parameter (LN=1152*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
complex c00(0:npts2-1) !Analytic representation of dd(), 6000 Hz
complex ,allocatable :: c0(:) !Ditto, with freq shift
! character c77*77,decoded*37
! logical unpk77_success
character decoded*37
real a(3) !twkfreq params f,f1,f2
real s3(LN) !Symbol spectra
real s3prob(64*NN) !Symbol-value probabilities
@ -61,7 +60,7 @@ subroutine q65_loops(c00,npts2,nsps,mode,mode_q65,nsubmode,nFadingModel, &
jpk=jpk0 + nsps*ndt/16 !tsym/16
if(jpk.lt.0) jpk=0
call timer('spec64 ',0)
call spec64(c0,nsps,mode,mode_q65,jpk,s3,LL,NN)
call spec64(c0,nsps,65,mode_q65,jpk,s3,LL,NN)
call timer('spec64 ',1)
call pctile(s3,LL*NN,40,base)
s3=s3/base
@ -75,54 +74,21 @@ subroutine q65_loops(c00,npts2,nsps,mode,mode_q65,nsubmode,nFadingModel, &
xx=1.885*log(3.0*width)+nbw
b90=1.7**xx
if(b90.gt.345.0) cycle
call timer('q65_intr',0)
b90ts = b90/baud
call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
call timer('q65_intr',1)
call timer('q65_dec ',0)
call q65_dec(s3,s3prob,APmask,APsymbols,esnodb,dat4,irc)
call timer('q65_dec ',1)
print*,'H',ibw,irc,iaptype,sum(s3(1:LL*NN))
! rewind 41
! write(41) LL*NN,s3(1:LL*NN)
if(irc.ge.0) id2=iaptype+2
!### Temporary ###
! if(irc.ge.0) then
! write(c77,1000) dat4(1:12),dat4(13)/2
!1000 format(12b6.6,b5.5)
! call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
! snr2=esnodb - db(2500.0/baud)
! xdt1=xdt0 + nsps*ndt/(16.0*6000.0)
! f1=f0 + 0.5*baud*ndf
! open(56,file='fort.56',status='unknown',position='append')
! write(56,3055) idf,idt,ibw,id2,irc,xdt1,f1,snr2,trim(decoded)
!3055 format(5i3,3f8.2,2x,a)
! close(56)
! endif
!###
if(irc.ge.0) go to 100
call q65_dec2(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
! irc > 0 ==> number of iterations required to decode
! -1 = invalid params
! -2 = decode failed
! -3 = CRC mismatch
if(irc.ge.0) then
id2=iaptype+2
print*,'D dec2 ',ibw,irc,decoded
go to 100
endif
enddo ! ibw (b90 loop)
enddo ! idt (DT loop)
enddo ! idf (f0 loop)
! if(iaptype.eq.0) then
! a=0.
! a(1)=-f0
! call twkfreq(c00,c0,npts2,6000.0,a)
! jpk=3000 !### Are these definitions OK?
! if(nsps.ge.3600) jpk=6000 !### TR >= 60 s
! call spec64(c0,nsps,mode,mode_q65,jpk,s3,LL,NN)
! call pctile(s3,LL*NN,40,base)
! s3=s3/base
! where(s3(1:LL*NN)>s3lim) s3(1:LL*NN)=s3lim
! endif
100 if(irc.ge.0) then
snr2=esnodb - db(2500.0/baud)
xdt1=xdt0 + nsps*ndt/(16.0*6000.0)

118
lib/q65_sync.f90 → lib/qra/q65/q65_sync.f90
View File

@ -1,5 +1,5 @@
subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
ndepth,lclearave,emedelay,xdt,f0,snr1,width,dat4,snr2,id1)
subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps, &
nfqso,ntol,ndepth,lclearave,emedelay,xdt,f0,snr1,width,dat4,snr2,id1)
! Detect and align with the Q65 sync vector, returning time and frequency
! offsets and SNR estimate.
@ -23,9 +23,8 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps,nfqso,ntol,
integer codewords(63,206)
integer dat4(13)
integer ijpk(2)
logical unpk77_success
logical lclearave
character*77 c77,decoded*37
character*37 decoded
real, allocatable :: s1(:,:) !Symbol spectra, 1/8-symbol steps
real, allocatable :: s3(:,:) !Data-symbol energies s3(LL,63)
real, allocatable :: ccf(:,:) !CCF(freq,lag)
@ -178,34 +177,22 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps,nfqso,ntol,
ibwa=1.8*log(baud*mode_q65) + 2
ibwb=min(10,ibwa+4)
10 do ibw=ibwa,ibwb
do ibw=ibwa,ibwb
b90=1.72**ibw
call q65_intrinsics_ff(s3,nsubmode,b90/baud,nFadingModel,s3prob)
call q65_dec_fullaplist(s3,s3prob,codewords,ncw,esnodb,dat4,plog,irc)
!###
write(*,3001) 'A',ibw,irc,xdt,f0,plog,sum(s3)
3001 format(a1,2i3,f7.2,3f8.1)
if(irc.gt.0) go to 100
!###
if(irc.ge.0 .and. plog.ge.PLOG_MIN) then
b90ts=b90/baud
call q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
! irc=-99 !### TEMPORARY ###
if(irc.ge.0) then
print*,'A dec1 ',ibw,irc,decoded
snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
id1=1
! write(c77,1000) dat4(1:12),dat4(13)/2
!1000 format(12b6.6,b5.5)
! call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
! open(55,file='fort.55',status='unknown',position='append')
! write(55,3055) nutc,ibw,xdt,f0,85.0*base,ccfmax,snr2,plog, &
! irc,trim(decoded)
!3055 format(i6,i3,6f8.2,i5,2x,a)
! close(55)
ic=ia2/4;
base=(sum(ccf1(-ia2:-ia2+ic)) + sum(ccf1(ia2-ic:ia2)))/(2.0+2.0*ic);
ccf1=ccf1-base
smax=maxval(ccf1)
if(smax.gt.10.0) ccf1=10.0*ccf1/smax
go to 200
go to 100 !### TEMPORARY ###
! go to 200
endif
enddo
@ -248,24 +235,26 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps,nfqso,ntol,
ccf1=ccf(:,jpk)/rms
if(snr1.gt.10.0) ccf1=(10.0/snr1)*ccf1
! Compute s3() here, then call q65_avg().
i1=i0+ipk-64
i2=i1+LL-1
if(snr1.ge.2.8 .and. i1.ge.1 .and. i2.le.iz) then
j=j0+jpk-7
n=0
do k=1,85
j=j+8
if(sync(k).gt.0.0) then
cycle
endif
n=n+1
if(j.ge.1 .and. j.le.jz) s3(-64:LL-65,n)=s1(i1:i2,j)
enddo
write(*,3002) 'B',xdt,f0,sum(s3)
3002 format(a1,f7.2,2f8.1)
call q65_avg(nutc,ntrperiod,mode_q65,LL,nfqso,ntol,lclearave, &
baud,nsubmode,ibwa,ibwb,codewords,ncw,xdt,f0,snr1,s3)
if(iand(ndepth,16).eq.16) then
! Fill s3() from s1() here, then call q65_avg().
i1=i0+ipk-64
i2=i1+LL-1
if(snr1.ge.2.8 .and. i1.ge.1 .and. i2.le.iz) then
j=j0+jpk-7
n=0
do k=1,85
j=j+8
if(sync(k).gt.0.0) then
cycle
endif
n=n+1
if(j.ge.1 .and. j.le.jz) s3(-64:LL-65,n)=s1(i1:i2,j)
enddo
! write(*,3002) 'B',xdt,f0,sum(s3)
!3002 format(a1,f7.2,2f8.1)
call q65_avg(nutc,ntrperiod,mode_q65,LL,nfqso,ntol,lclearave, &
baud,nsubmode,ibwa,ibwb,codewords,ncw,xdt,f0,snr1,s3)
endif
endif
200 smax=maxval(ccf1)
@ -286,3 +275,48 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps,nfqso,ntol,
900 return
end subroutine q65_sync
subroutine q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
use q65
use packjt77
real s3prob(0:63,63) !Symbol-value probabilities
integer codewords(63,206)
integer dat4(13)
character c77*77,decoded*37
logical unpk77_success
nFadingModel=1
decoded=' '
call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
call q65_dec_fullaplist(s3,s3prob,codewords,ncw,esnodb,dat4,plog,irc)
if(irc.ge.0 .and. plog.gt.PLOG_MIN) then
write(c77,1000) dat4(1:12),dat4(13)/2
1000 format(12b6.6,b5.5)
call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
endif
return
end subroutine q65_dec1
subroutine q65_dec2(s3,nsubmode,b90ts,esnodb,irc,dat4,decoded)
use q65
use packjt77
real s3prob(0:63,63) !Symbol-value probabilities
integer dat4(13)
character c77*77,decoded*37
logical unpk77_success
nFadingModel=1
decoded=' '
call q65_intrinsics_ff(s3,nsubmode,b90ts,nFadingModel,s3prob)
call q65_dec(s3,s3prob,APmask,APsymbols,esnodb,dat4,irc)
if(irc.ge.0) then
write(c77,1000) dat4(1:12),dat4(13)/2
1000 format(12b6.6,b5.5)
call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
endif
return
end subroutine q65_dec2