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Working toward some new, separate, Q65 subroutines.
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Joe Taylor
parent
a75037d053
commit
60a053aa94
@ -21,12 +21,11 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps, &
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parameter (LN=2176*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
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parameter (LN=2176*63) !LN=LL*NN; LL=64*(mode_q65+2), NN=63
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integer*2 iwave(0:12000*ntrperiod-1) !Raw data
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integer*2 iwave(0:12000*ntrperiod-1) !Raw data
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integer isync(22) !Indices of sync symbols
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integer isync(22) !Indices of sync symbols
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integer itone(85)
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integer codewords(63,206)
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integer codewords(63,206)
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integer dat4(13)
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integer dat4(13)
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integer ijpk(2)
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integer ijpk(2)
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logical lclearave
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character*37 decoded
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character*37 decoded
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logical lclearave
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real, allocatable :: s1(:,:) !Symbol spectra, 1/8-symbol steps
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real, allocatable :: s1(:,:) !Symbol spectra, 1/8-symbol steps
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real, allocatable :: s3(:,:) !Data-symbol energies s3(LL,63)
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real, allocatable :: s3(:,:) !Data-symbol energies s3(LL,63)
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real, allocatable :: ccf(:,:) !CCF(freq,lag)
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real, allocatable :: ccf(:,:) !CCF(freq,lag)
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@ -104,105 +103,15 @@ subroutine q65_sync(nutc,iwave,ntrperiod,mode_q65,codewords,ncw,nsps, &
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!######################################################################
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!######################################################################
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! Try list decoding via "Deep Likelihood".
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! Try list decoding via "Deep Likelihood".
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call timer('list_dec',0)
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call timer('list_dec',0)
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! call q65_dec_q3(codewords,ncw,isync,df
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call q65_dec_q3(codewords,ncw,isync,sync,df,s1,iz,jz,ia,ibwa,ibwb, &
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nstep,nsps,mode_q65,lag1,lag2,i0,j0,ccf,ccf1,ccf2,ia2,s3,LL,snr2, &
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ipk=0
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dat4,idec,decoded)
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jpk=0
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ccf_best=0.
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imsg_best=-1
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do imsg=1,ncw
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i=1
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k=0
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do j=1,85
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if(j.eq.isync(i)) then
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i=i+1
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itone(j)=-1
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else
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k=k+1
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itone(j)=codewords(k,imsg)
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endif
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enddo
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! Compute 2D ccf using all 85 symbols in the list message
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ccf=0.
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iia=200.0/df
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do lag=lag1,lag2
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do k=1,85
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j=j0 + NSTEP*(k-1) + 1 + lag
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if(j.ge.1 .and. j.le.jz) then
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do i=-ia2,ia2
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ii=i0+mode_q65*itone(k)+i
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if(ii.ge.iia .and. ii.le.iz) ccf(i,lag)=ccf(i,lag) + s1(ii,j)
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enddo
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endif
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enddo
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enddo
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ccfmax=maxval(ccf(-ia:ia,:))
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if(ccfmax.gt.ccf_best) then
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ccf_best=ccfmax
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ijpk=maxloc(ccf(-ia:ia,:))
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ipk=ijpk(1)-ia-1
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jpk=ijpk(2)-53-1
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f0=nfqso + (ipk-mode_q65)*df
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xdt=jpk*dtstep
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imsg_best=imsg
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ccf1=ccf(:,jpk)
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endif
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enddo ! imsg
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call timer('list_dec',1)
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call timer('list_dec',1)
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if(idec.lt.0) then
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i1=i0+ipk-64
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i2=i1+LL-1
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j=j0+jpk-7
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n=0
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do k=1,85
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j=j+8
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if(sync(k).gt.0.0) then
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cycle
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endif
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n=n+1
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if(j.ge.1 .and. j.le.jz) then
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do i=0,LL-1
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s3(i-64,n)=s1(i+i1,j) !Copy from s1 into s3
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enddo
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endif
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enddo
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nsubmode=0
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if(mode_q65.eq.2) nsubmode=1
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if(mode_q65.eq.4) nsubmode=2
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if(mode_q65.eq.8) nsubmode=3
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if(mode_q65.eq.16) nsubmode=4
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nFadingModel=1
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baud=12000.0/nsps
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do ibw=ibwa,ibwb
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b90=1.72**ibw
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b90ts=b90/baud
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call timer('dec1 ',0)
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call q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
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call timer('dec1 ',1)
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if(irc.ge.0) then
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snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
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idec=1
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ic=ia2/4;
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base=(sum(ccf1(-ia2:-ia2+ic)) + sum(ccf1(ia2-ic:ia2)))/(2.0+2.0*ic);
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ccf1=ccf1-base
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smax=maxval(ccf1)
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if(smax.gt.10.0) ccf1=10.0*ccf1/smax
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base=(sum(ccf2(-ia2:-ia2+ic)) + sum(ccf2(ia2-ic:ia2)))/(2.0+2.0*ic);
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ccf2=ccf2-base
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smax=maxval(ccf2)
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if(smax.gt.10.0) ccf2=10.0*ccf2/smax
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go to 100
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endif
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enddo
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irc=-2
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irc=-2
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dat4=0
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dat4=0
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endif
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!######################################################################
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!######################################################################
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! Compute the 2D CCF using sync symbols only
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! Compute the 2D CCF using sync symbols only
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@ -329,6 +238,115 @@ subroutine q65_symspec(iwave,nmax,nsps,iz,jz,istep,nsmo,s1)
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return
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return
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end subroutine q65_symspec
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end subroutine q65_symspec
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subroutine q65_dec_q3(codewords,ncw,isync,sync,df,s1,iz,jz,ia,ibwa,ibwb, &
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nstep,nsps,mode_q65,lag1,lag2,i0,j0,ccf,ccf1,ccf2,ia2,s3,LL,snr2, &
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dat4,idec,decoded)
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character*37 decoded
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integer isync(22) !Indices of sync symbols
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integer itone(85)
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integer ijpk(2)
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integer codewords(63,206)
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integer dat4(13)
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real ccf(-ia2:ia2,-53:214)
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real ccf1(-ia2:ia2)
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real ccf2(-ia2:ia2)
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real s1(iz,jz)
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real s3(-64:LL-65,63)
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real sync(85) !sync vector
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ipk=0
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jpk=0
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ccf_best=0.
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imsg_best=-1
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do imsg=1,ncw
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i=1
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k=0
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do j=1,85
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if(j.eq.isync(i)) then
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i=i+1
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itone(j)=-1
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else
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k=k+1
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itone(j)=codewords(k,imsg)
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endif
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enddo
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! Compute 2D ccf using all 85 symbols in the list message
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ccf=0.
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iia=200.0/df
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do lag=lag1,lag2
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do k=1,85
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j=j0 + NSTEP*(k-1) + 1 + lag
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if(j.ge.1 .and. j.le.jz) then
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do i=-ia2,ia2
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ii=i0+mode_q65*itone(k)+i
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if(ii.ge.iia .and. ii.le.iz) ccf(i,lag)=ccf(i,lag) + s1(ii,j)
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enddo
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endif
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enddo
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enddo
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ccfmax=maxval(ccf(-ia:ia,:))
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if(ccfmax.gt.ccf_best) then
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ccf_best=ccfmax
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ijpk=maxloc(ccf(-ia:ia,:))
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ipk=ijpk(1)-ia-1
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jpk=ijpk(2)-53-1
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f0=nfqso + (ipk-mode_q65)*df
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xdt=jpk*dtstep
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imsg_best=imsg
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ccf1=ccf(:,jpk)
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endif
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enddo ! imsg
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i1=i0+ipk-64
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i2=i1+LL-1
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j=j0+jpk-7
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n=0
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do k=1,85
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j=j+8
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if(sync(k).gt.0.0) then
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cycle
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endif
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n=n+1
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if(j.ge.1 .and. j.le.jz) then
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do i=0,LL-1
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s3(i-64,n)=s1(i+i1,j) !Copy from s1 into s3
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enddo
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endif
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enddo
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nsubmode=0
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if(mode_q65.eq.2) nsubmode=1
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if(mode_q65.eq.4) nsubmode=2
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if(mode_q65.eq.8) nsubmode=3
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if(mode_q65.eq.16) nsubmode=4
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nFadingModel=1
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baud=12000.0/nsps
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do ibw=ibwa,ibwb
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b90=1.72**ibw
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b90ts=b90/baud
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call q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
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if(irc.ge.0) then
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snr2=esnodb - db(2500.0/baud) + 3.0 !Empirical adjustment
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idec=1
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ic=ia2/4;
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base=(sum(ccf1(-ia2:-ia2+ic)) + sum(ccf1(ia2-ic:ia2)))/(2.0+2.0*ic);
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ccf1=ccf1-base
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smax=maxval(ccf1)
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if(smax.gt.10.0) ccf1=10.0*ccf1/smax
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base=(sum(ccf2(-ia2:-ia2+ic)) + sum(ccf2(ia2-ic:ia2)))/(2.0+2.0*ic);
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ccf2=ccf2-base
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smax=maxval(ccf2)
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if(smax.gt.10.0) ccf2=10.0*ccf2/smax
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exit
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endif
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enddo
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return
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end subroutine q65_dec_q3
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subroutine q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
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subroutine q65_dec1(s3,nsubmode,b90ts,codewords,ncw,esnodb,irc,dat4,decoded)
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