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https://github.com/saitohirga/WSJT-X.git
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Many improvements to QRA66 decoder.
This commit is contained in:
Joe Taylor
parent
c91baddb2c
commit
7b2e9c4e5d
@ -44,9 +44,9 @@ contains
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integer ipk(1)
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integer ipk(1)
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integer dat4(12)
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integer dat4(12)
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logical lapdx,ltext
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logical lapdx,ltext
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complex c0(0:NFFT1-1) !Spectrum, then analytic signal
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complex c00(0:NFFT1-1) !Spectrum, then analytic signal
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complex c0(0:NFFT1-1) !Snalytic signal
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real s(900)
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real s(900)
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real s3a(-64:127,63)
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real s3(-64:127,63)
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real s3(-64:127,63)
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real a(5)
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real a(5)
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data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/
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data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/
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@ -64,7 +64,7 @@ contains
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call packcall(hiscall(1:6),nc2,ltext)
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call packcall(hiscall(1:6),nc2,ltext)
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call packgrid(hisgrid(1:4),ng2,ltext)
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call packgrid(hisgrid(1:4),ng2,ltext)
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nSubmode=0
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nSubmode=0
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b90=20
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b90=20.0 !8 to 25 is OK; not very critical
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nFadingModel=1
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nFadingModel=1
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! These probably need work:
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! These probably need work:
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@ -111,43 +111,36 @@ contains
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ipk=maxloc(s)
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ipk=maxloc(s)
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f0=df2*ipk(1) - 0.5*baud !Candidate sync frequency
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f0=df2*ipk(1) - 0.5*baud !Candidate sync frequency
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! do i=1,iz
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! write(51,3051) i*df2,s(i)
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!3051 format(f12.6,e12.3)
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! enddo
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c0(NFFT2/2+1:NFFT2)=0. !Zero the top half
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c0(NFFT2/2+1:NFFT2)=0. !Zero the top half
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c0(0)=0.5*c0(0)
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c0(0)=0.5*c0(0)
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call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT
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call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT
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! call sync66(c0,f0,jpk,sync) !c0 is analytic signal at 6000 S/s
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ntol=100
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ntol=100
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call sync66a(iwave,15*12000,nsps,nfqso,ntol,xdt,f0)
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call sync66a(iwave,15*12000,nsps,nfqso,ntol,xdt,f0,snr1)
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jpk=(xdt+0.5)*6000
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jpk=(xdt+0.5)*6000 - 384 !### Empirical ###
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if(jpk.lt.0) jpk=0
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if(jpk.lt.0) jpk=0
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c00=c0
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! Genie sync:
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! jpk=3600
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! xdt=jpk/6000.0 - 0.5
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! f0=1510
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! f0=1490
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a=0.
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a=0.
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! a(1)=-(f0 + 1.5*baud) !For sync66
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a(1)=-(f0 + 2.0*baud) !For sync66a
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a(1)=-(f0 + 2.0*baud) !For sync66a
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call twkfreq(c00,c0,15*6000,6000.0,a)
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xdt=jpk/6000.0 - 0.5
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call spec66(c0(jpk:jpk+85*NSPS/2-1),s3)
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do j=1,63
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call twkfreq(c0,c0,15*6000,6000.0,a)
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call pctile(s3(:,j),192,40,base)
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call spec66(c0(jpk:jpk+85*NSPS-1),s3)
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s3(:,j)=s3(:,j)/base
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s3a=s3/maxval(s3)
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enddo
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call pctile(s3a,192*63,40,base)
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! Apply AGC
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s3a=s3a/base
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s3max=20.0
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s3lim=10.
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do j=1,63
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where(s3a(-64:127,1:63)>s3lim) s3a(-64:127,1:63)=s3lim
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xx=maxval(s3(-64:127,j))
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if(xx.gt.s3max) s3(-64:127,j)=s3(-64:127,j)*s3max/xx
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call qra64_dec(s3a,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
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enddo
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call qra64_dec(s3,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
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nFadingModel,dat4,snr2,irc)
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nFadingModel,dat4,snr2,irc)
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snr2=snr2 + 6.0
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if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
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if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
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decoded=' '
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decoded=' '
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@ -171,6 +164,9 @@ contains
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!###
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!###
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endif
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endif
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! write(61,3061) nutc,irc,xdt,f0,snr1,snr2,trim(decoded)
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!3061 format(i6.6,i4,4f10.2,2x,a)
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return
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return
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end subroutine decode
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end subroutine decode
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@ -1,4 +1,4 @@
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subroutine sync66a(iwave,nmax,nsps,nfqso,ntol,xdt,f0)
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subroutine sync66a(iwave,nmax,nsps,nfqso,ntol,xdt,f0,snr1)
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parameter (NSTEP=4) !Quarter-symbol steps
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parameter (NSTEP=4) !Quarter-symbol steps
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parameter (IZ=1600,JZ=352,NSPSMAX=1920)
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parameter (IZ=1600,JZ=352,NSPSMAX=1920)
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@ -49,7 +49,7 @@ subroutine sync66a(iwave,nmax,nsps,nfqso,ntol,xdt,f0)
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s1=s1/base
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s1=s1/base
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s1max=20.0
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s1max=20.0
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! Make this simpler: just add the 22 nonzero values.
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! Apply AGC
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do j=1,JZ
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do j=1,JZ
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x(j)=maxval(s1(i0-64:i0+192,j))
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x(j)=maxval(s1(i0-64:i0+192,j))
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if(x(j).gt.s1max) s1(i0-64:i0+192,j)=s1(i0-64:i0+192,j)*s1max/x(j)
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if(x(j).gt.s1max) s1(i0-64:i0+192,j)=s1(i0-64:i0+192,j)*s1max/x(j)
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@ -63,6 +63,7 @@ subroutine sync66a(iwave,nmax,nsps,nfqso,ntol,xdt,f0)
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do i=-ia,ia
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do i=-ia,ia
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x=s1(i0+2+i,:)-s1(i0+i,:)
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x=s1(i0+2+i,:)-s1(i0+i,:)
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do lag=-15,15
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do lag=-15,15
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! Make this simpler: just add the 22 nonzero values?
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do n=1,4*85
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do n=1,4*85
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j=n+lag+11
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j=n+lag+11
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if(j.ge.1 .and. j.le.JZ) sync_sig(i,lag)=sync_sig(i,lag) + sync(n)*x(j)
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if(j.ge.1 .and. j.le.JZ) sync_sig(i,lag)=sync_sig(i,lag) + sync(n)*x(j)
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@ -80,15 +81,18 @@ subroutine sync66a(iwave,nmax,nsps,nfqso,ntol,xdt,f0)
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tsym=nsps/12000.0
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tsym=nsps/12000.0
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xdt=jdt*tsym/4.0
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xdt=jdt*tsym/4.0
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snr1=maxval(sync_sig)/22.0
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! do i=-64,64
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! do i=-64,64
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! write(13,3013) nfqso+i*df,sync_sig(i,jj)
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! write(62,3062) nfqso+i*df,sync_sig(i,jj)
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!3013 format(2f12.3)
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!3062 format(2f12.3)
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! enddo
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! enddo
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! do j=-15,15
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! do j=-15,15
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! write(14,3014) j,j*dt4,sync_sig(ii,j)
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! write(63,3063) j,j*dt4,sync_sig(ii,j)
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!3014 format(i5,2f12.3)
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!3063 format(i5,2f12.3)
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! enddo
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! enddo
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return
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return
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end subroutine sync66a
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end subroutine sync66a
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