mirror of https://github.com/saitohirga/WSJT-X.git
Speed up sync.
This commit is contained in:
Steve Franke
parent
5e1637a5db
commit
73efc09392
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@ -19,7 +19,7 @@ subroutine ft4_decode(cdatetime0,tbuf,nfa,nfb,nQSOProgress,ncontest,nfqso, &
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complex cd2(0:NMAX/NDOWN-1) !Complex waveform
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complex cb(0:NMAX/NDOWN-1)
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complex cd(0:NN*NSS-1) !Complex waveform
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complex ctwk(4*NSS),ctwk2(4*NSS)
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complex ctwk(2*NSS),ctwk2(2*NSS,-16:16)
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complex csymb(NSS)
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complex cs(0:3,NN)
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real s4(0:3,NN)
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@ -63,7 +63,7 @@ subroutine ft4_decode(cdatetime0,tbuf,nfa,nfb,nQSOProgress,ncontest,nfqso, &
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1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
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0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
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save fs,dt,tt,txt,twopi,h,one,first,linex,apbits,nappasses,naptypes, &
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mycall0,hiscall0,msg0,cqstr0
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mycall0,hiscall0,msg0,cqstr0,ctwk2
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call clockit('ft4_deco',0)
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hhmmss=cdatetime0(8:13)
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@ -82,6 +82,15 @@ subroutine ft4_decode(cdatetime0,tbuf,nfa,nfb,nQSOProgress,ncontest,nfqso, &
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enddo
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enddo
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do idf=-16,16
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a=0.
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a(1)=real(idf)
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ctwk=1.
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call clockit('twkfreq1',0)
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call twkfreq1(ctwk,2*NSS,fs/2.0,a,ctwk2(:,idf))
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call clockit('twkfreq1',1)
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enddo
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mrrr=2*mod(mrrr+rvec(59:77),2)-1
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m73=2*mod(m73+rvec(59:77),2)-1
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mrr73=2*mod(mrr73+rvec(59:77),2)-1
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@ -182,9 +191,8 @@ subroutine ft4_decode(cdatetime0,tbuf,nfa,nfb,nQSOProgress,ncontest,nfqso, &
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ndecodes=0
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do icand=1,ncand
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f0=candidate(1,icand)
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if(f0.le.max(fa,10.0) .or. f0.ge.min(fb,4990.0)) cycle
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snr=candidate(3,icand)-1.0
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if( f0.le.10.0 .or. f0.ge.4990.0 ) cycle
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call clockit('ft4_down',0)
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call ft4_downsample(iwave,f0,cd2) !Downsample from 512 to 32 Sa/Symbol
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call clockit('ft4_down',1)
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@ -212,16 +220,10 @@ subroutine ft4_decode(cdatetime0,tbuf,nfa,nfb,nQSOProgress,ncontest,nfqso, &
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smax=-99.
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idfbest=0
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do idf=idfmin,idfmax,idfstp
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a=0.
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a(1)=real(idf)
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ctwk=1.
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call clockit('twkfreq1',0)
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call twkfreq1(ctwk,4*NSS,fs,a,ctwk2)
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call clockit('twkfreq1',1)
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call clockit('sync4d ',0)
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do istart=ibmin,ibmax,ibstp
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call sync4d(cd2,istart,ctwk2,1,sync,sync2) !Find sync power
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call sync4d(cd2,istart,ctwk2(:,idf),1,sync) !Find sync power
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if(sync.gt.smax) then
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smax=sync
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ibest=istart
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@ -1,13 +1,13 @@
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subroutine sync4d(cd0,i0,ctwk,itwk,sync,sync2)
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subroutine sync4d(cd0,i0,ctwk,itwk,sync)
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! Compute sync power for a complex, downsampled FT4 signal.
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include 'ft4_params.f90'
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parameter(NP=NMAX/NDOWN,NSS=NSPS/NDOWN)
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complex cd0(0:NP-1)
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complex csynca(4*NSS),csyncb(4*NSS),csyncc(4*NSS),csyncd(4*NSS)
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complex csync2(4*NSS)
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complex ctwk(4*NSS)
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complex csynca(2*NSS),csyncb(2*NSS),csyncc(2*NSS),csyncd(2*NSS)
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complex csync2(2*NSS)
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complex ctwk(2*NSS)
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complex z1,z2,z3,z4
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complex zz1,zz2,zz3,zz4
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logical first
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@ -29,11 +29,11 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync,sync2)
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phic=0.0
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phid=0.0
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do i=0,3
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dphia=twopi*icos4a(i)/real(NSS)
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dphib=twopi*icos4b(i)/real(NSS)
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dphic=twopi*icos4c(i)/real(NSS)
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dphid=twopi*icos4d(i)/real(NSS)
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do j=1,NSS
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dphia=2*twopi*icos4a(i)/real(NSS)
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dphib=2*twopi*icos4b(i)/real(NSS)
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dphic=2*twopi*icos4c(i)/real(NSS)
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dphid=2*twopi*icos4d(i)/real(NSS)
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do j=1,NSS/2
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csynca(k)=cmplx(cos(phia),sin(phia))
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csyncb(k)=cmplx(cos(phib),sin(phib))
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csyncc(k)=cmplx(cos(phic),sin(phic))
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@ -46,7 +46,7 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync,sync2)
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enddo
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enddo
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first=.false.
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fac=1.0/(4.0*NSS)
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fac=1.0/(2.0*NSS)
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endif
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i1=i0 !four Costas arrays
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@ -60,36 +60,18 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync,sync2)
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z4=0.
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if(itwk.eq.1) csync2=ctwk*csynca !Tweak the frequency
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if(i1.ge.0 .and. i1+4*NSS-1.le.NP-1) z1=sum(cd0(i1:i1+4*NSS-1)*conjg(csync2))
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if(i1.ge.0 .and. i1+4*NSS-1.le.NP-1) z1=sum(cd0(i1:i1+4*NSS-1:2)*conjg(csync2))
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if(itwk.eq.1) csync2=ctwk*csyncb !Tweak the frequency
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if(i2.ge.0 .and. i2+4*NSS-1.le.NP-1) z2=sum(cd0(i2:i2+4*NSS-1)*conjg(csync2))
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if(i2.ge.0 .and. i2+4*NSS-1.le.NP-1) z2=sum(cd0(i2:i2+4*NSS-1:2)*conjg(csync2))
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if(itwk.eq.1) csync2=ctwk*csyncc !Tweak the frequency
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if(i3.ge.0 .and. i3+4*NSS-1.le.NP-1) z3=sum(cd0(i3:i3+4*NSS-1)*conjg(csync2))
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if(i3.ge.0 .and. i3+4*NSS-1.le.NP-1) z3=sum(cd0(i3:i3+4*NSS-1:2)*conjg(csync2))
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if(itwk.eq.1) csync2=ctwk*csyncd !Tweak the frequency
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if(i4.ge.0 .and. i4+4*NSS-1.le.NP-1) z4=sum(cd0(i4:i4+4*NSS-1)*conjg(csync2))
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if(i4.ge.0 .and. i4+4*NSS-1.le.NP-1) z4=sum(cd0(i4:i4+4*NSS-1:2)*conjg(csync2))
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sync = p(z1) + p(z2) + p(z3) + p(z4)
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sync2=0.0
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!do i=1,4
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! i1=i0+(i-1)*33*NSS
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! if(i.eq.1) csync2=ctwk*csynca
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! if(i.eq.2) csync2=ctwk*csyncb
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! if(i.eq.3) csync2=ctwk*csyncc
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! if(i.eq.4) csync2=ctwk*csyncd
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! z1=sum(cd0(i1 :i1+ NSS-1)*conjg(csync2( 1: NSS)))
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! z2=sum(cd0(i1+ NSS:i1+2*NSS-1)*conjg(csync2( NSS+1:2*NSS)))
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! z3=sum(cd0(i1+2*NSS:i1+3*NSS-1)*conjg(csync2(2*NSS+1:3*NSS)))
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! z4=sum(cd0(i1+3*NSS:i1+4*NSS-1)*conjg(csync2(3*NSS+1:4*NSS)))
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! sync2=sync2 + abs(z1)**2+abs(z2)**2+abs(z3)**2+abs(z4)**2+&
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! 2*abs(z1*conjg(z2)+z2*conjg(z3)+z3*conjg(z4)) + &
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! 2*abs(z1*conjg(z3)+z2*conjg(z4)) + &
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! 2*abs(z1*conjg(z4))
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!enddo
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!sync2=sync2*(fac**2)
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return
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end subroutine sync4d
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