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Working toward some new, separate, Q65 subroutines.

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This commit is contained in:
Joe Taylor 2021-01-12 14:34:41 -05:00
parent a75037d053
commit 60a053aa94
1 changed files with 117 additions and 99 deletions
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212
lib/qra/q65/q65_sync.f90
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@ -21,12 +21,11 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps, &
parameter (LN=2176*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
integer*2 iwave(0:12000*ntrperiod-1) !Raw data
integer isync(22) !Indices of sync symbols
integer itone(85)
integer codewords(63,206)
integer dat4(13)
integer ijpk(2)
logical lclearave
character*37 decoded
logical lclearave
real, allocatable :: s1(:,:) !Symbol spectra, 1/8-symbol steps
real, allocatable :: s3(:,:) !Data-symbol energies s3(LL,63)
real, allocatable :: ccf(:,:) !CCF(freq,lag)
@ -104,105 +103,15 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps, &
!######################################################################
! Try list decoding via "Deep Likelihood".
call timer('list_dec',0)
! call q65_dec_q3(codewords,ncw,isync,df
ipk=0
jpk=0
ccf_best=0.
imsg_best=-1
do imsg=1,ncw
i=1
k=0
do j=1,85
if(j.eq.isync(i)) then
i=i+1
itone(j)=-1
else
k=k+1
itone(j)=codewords(k,imsg)
endif
enddo
! Compute 2D ccf using all 85 symbols in the list message
ccf=0.
iia=200.0/df
do lag=lag1,lag2
do k=1,85
j=j0 + NSTEP*(k-1) + 1 + lag
if(j.ge.1 .and. j.le.jz) then
do i=-ia2,ia2
ii=i0+mode_q65*itone(k)+i
if(ii.ge.iia .and. ii.le.iz) ccf(i,lag)=ccf(i,lag) + s1(ii,j)
enddo
endif
enddo
enddo
ccfmax=maxval(ccf(-ia:ia,:))
if(ccfmax.gt.ccf_best) then
ccf_best=ccfmax
ijpk=maxloc(ccf(-ia:ia,:))
ipk=ijpk(1)-ia-1
jpk=ijpk(2)-53-1
f0=nfqso + (ipk-mode_q65)*df
xdt=jpk*dtstep
imsg_best=imsg
ccf1=ccf(:,jpk)
endif
enddo ! imsg
call q65_dec_q3(codewords,ncw,isync,sync,df,s1,iz,jz,ia,ibwa,ibwb, &
nstep,nsps,mode_q65,lag1,lag2,i0,j0,ccf,ccf1,ccf2,ia2,s3,LL,snr2, &
dat4,idec,decoded)
call timer('list_dec',1)
i1=i0+ipk-64
i2=i1+LL-1
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) then
do i=0,LL-1
s3(i-64,n)=s1(i+i1,j) !Copy from s1 into s3
enddo
endif
enddo
nsubmode=0
if(mode_q65.eq.2) nsubmode=1
if(mode_q65.eq.4) nsubmode=2
if(mode_q65.eq.8) nsubmode=3
if(mode_q65.eq.16) nsubmode=4
nFadingModel=1
baud=12000.0/nsps
do ibw=ibwa,ibwb
b90=1.72**ibw
b90ts=b90/baud
call timer('dec1 ',0)
call q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
call timer('dec1 ',1)
if(irc.ge.0) then
snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
idec=1
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
base=(sum(ccf2(-ia2:-ia2+ic)) + sum(ccf2(ia2-ic:ia2)))/(2.0+2.0*ic);
ccf2=ccf2-base
smax=maxval(ccf2)
if(smax.gt.10.0) ccf2=10.0*ccf2/smax
go to 100
endif
enddo
if(idec.lt.0) then
irc=-2
dat4=0
endif
!######################################################################
! Compute the 2D CCF using sync symbols only
@ -329,6 +238,115 @@ subroutine q65_symspec(iwave,nmax,nsps,iz,jz,istep,nsmo,s1)
return
end subroutine q65_symspec
subroutine q65_dec_q3(codewords,ncw,isync,sync,df,s1,iz,jz,ia,ibwa,ibwb, &
nstep,nsps,mode_q65,lag1,lag2,i0,j0,ccf,ccf1,ccf2,ia2,s3,LL,snr2, &
dat4,idec,decoded)
character*37 decoded
integer isync(22) !Indices of sync symbols
integer itone(85)
integer ijpk(2)
integer codewords(63,206)
integer dat4(13)
real ccf(-ia2:ia2,-53:214)
real ccf1(-ia2:ia2)
real ccf2(-ia2:ia2)
real s1(iz,jz)
real s3(-64:LL-65,63)
real sync(85) !sync vector
ipk=0
jpk=0
ccf_best=0.
imsg_best=-1
do imsg=1,ncw
i=1
k=0
do j=1,85
if(j.eq.isync(i)) then
i=i+1
itone(j)=-1
else
k=k+1
itone(j)=codewords(k,imsg)
endif
enddo
! Compute 2D ccf using all 85 symbols in the list message
ccf=0.
iia=200.0/df
do lag=lag1,lag2
do k=1,85
j=j0 + NSTEP*(k-1) + 1 + lag
if(j.ge.1 .and. j.le.jz) then
do i=-ia2,ia2
ii=i0+mode_q65*itone(k)+i
if(ii.ge.iia .and. ii.le.iz) ccf(i,lag)=ccf(i,lag) + s1(ii,j)
enddo
endif
enddo
enddo
ccfmax=maxval(ccf(-ia:ia,:))
if(ccfmax.gt.ccf_best) then
ccf_best=ccfmax
ijpk=maxloc(ccf(-ia:ia,:))
ipk=ijpk(1)-ia-1
jpk=ijpk(2)-53-1
f0=nfqso + (ipk-mode_q65)*df
xdt=jpk*dtstep
imsg_best=imsg
ccf1=ccf(:,jpk)
endif
enddo ! imsg
i1=i0+ipk-64
i2=i1+LL-1
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) then
do i=0,LL-1
s3(i-64,n)=s1(i+i1,j) !Copy from s1 into s3
enddo
endif
enddo
nsubmode=0
if(mode_q65.eq.2) nsubmode=1
if(mode_q65.eq.4) nsubmode=2
if(mode_q65.eq.8) nsubmode=3
if(mode_q65.eq.16) nsubmode=4
nFadingModel=1
baud=12000.0/nsps
do ibw=ibwa,ibwb
b90=1.72**ibw
b90ts=b90/baud
call q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
if(irc.ge.0) then
snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
idec=1
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
base=(sum(ccf2(-ia2:-ia2+ic)) + sum(ccf2(ia2-ic:ia2)))/(2.0+2.0*ic);
ccf2=ccf2-base
smax=maxval(ccf2)
if(smax.gt.10.0) ccf2=10.0*ccf2/smax
exit
endif
enddo
return
end subroutine q65_dec_q3
subroutine q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)