mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-25 13:48:42 -05:00
FT4: Imrovements to sync.
Divide DT search range into 3 segments. Search central segment (near DT=0) first and try to decode the largest peak. Then find the largest peak in each of the surrounding segments and try to decode those only if the peak is larger than the one found in the central segment. Also re-indent ft4_decode.f90 and some other minor tweaks.
This commit is contained in:
Steve Franke
parent
b4a318e5a9
commit
c26d0b4f29
@ -8,7 +8,7 @@ subroutine getcandidates4(dd,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
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real x(NFFT1)
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real window(NFFT1)
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complex cx(0:NH1)
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real candidate(3,maxcand)
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real candidate(2,maxcand)
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real dd(NMAX)
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integer ipk(1)
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equivalence (x,cx)
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@ -64,8 +64,7 @@ subroutine getcandidates4(dd,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
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speak=savsm(i) - 0.25*(savsm(i-1)-savsm(i+1))*del
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ncand=ncand+1
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candidate(1,ncand)=fpeak
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candidate(2,ncand)=-99.99
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candidate(3,ncand)=speak
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candidate(2,ncand)=speak
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if(ncand.eq.maxcand) exit
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endif
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enddo
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@ -18,7 +18,7 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync)
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data first/.true./
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save first,twopi,csynca,csyncb,csyncc,csyncd,fac
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p(z1)=sqrt(real(z1*fac)**2 + aimag(z1*fac)**2) !Statement function for power
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p(z1)=(real(z1*fac)**2 + aimag(z1*fac)**2)**0.5 !Statement function for power
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if( first ) then
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twopi=8.0*atan(1.0)
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@ -50,7 +50,7 @@ contains
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real bitmetrics(2*NN,3)
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real dd(NMAX)
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real llr(2*ND),llra(2*ND),llrb(2*ND),llrc(2*ND),llrd(2*ND)
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real candidate(3,100)
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real candidate(2,100)
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real savg(NH1),sbase(NH1)
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integer apbits(2*ND)
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@ -203,21 +203,21 @@ contains
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doosd=.true.
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nsp=3
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if(ndepth.eq.2) then
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doosd=.false.
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doosd=.false.
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endif
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if(ndepth.eq.1) then
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nsp=1
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dosubtract=.false.
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doosd=.false.
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nsp=1
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dosubtract=.false.
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doosd=.false.
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endif
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do isp = 1,nsp
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if(isp.eq.2) then
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if(ndecodes.eq.0) exit
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nd1=ndecodes
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if(ndecodes.eq.0) exit
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nd1=ndecodes
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elseif(isp.eq.3) then
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nd2=ndecodes-nd1
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if(nd2.eq.0) exit
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nd2=ndecodes-nd1
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if(nd2.eq.0) exit
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endif
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candidate=0.0
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@ -229,7 +229,7 @@ contains
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dobigfft=.true.
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do icand=1,ncand
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f0=candidate(1,icand)
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snr=candidate(3,icand)-1.0
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snr=candidate(2,icand)-1.0
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call timer('ft4_down',0)
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call ft4_downsample(dd,dobigfft,f0,cd2) !Downsample to 32 Sam/Sym
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call timer('ft4_down',1)
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@ -237,99 +237,113 @@ contains
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sum2=sum(cd2*conjg(cd2))/(real(NMAX)/real(NDOWN))
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if(sum2.gt.0.0) cd2=cd2/sqrt(sum2)
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! Sample rate is now 12000/18 = 666.67 samples/second
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do isync=1,2
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if(isync.eq.1) then
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idfmin=-12
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idfmax=12
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idfstp=3
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ibmin=-344
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ibmax=1012
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ibstp=4
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else
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idfmin=idfbest-4
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idfmax=idfbest+4
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idfstp=1
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ibmin=ibest-5
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ibmax=ibest+5
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ibstp=1
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endif
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ibest=-1
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smax=-99.
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idfbest=0
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call timer('sync4d ',0)
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do idf=idfmin,idfmax,idfstp
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do istart=ibmin,ibmax,ibstp
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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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idfbest=idf
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do iseg=1,3 ! DT search is done over 3 segments
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do isync=1,2
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if(isync.eq.1) then
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idfmin=-12
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idfmax=12
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idfstp=3
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ibmin=-344
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ibmax=1012
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if(iseg.eq.1) then
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ibmin=108
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ibmax=560
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elseif(iseg.eq.2) then
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smax1=smax
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ibmin=560
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ibmax=1012
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elseif(iseg.eq.3) then
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ibmin=-344
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ibmax=108
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endif
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ibstp=4
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else
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idfmin=idfbest-4
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idfmax=idfbest+4
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idfstp=1
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ibmin=ibest-5
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ibmax=ibest+5
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ibstp=1
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endif
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ibest=-1
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idfbest=0
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smax=-99.
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call timer('sync4d ',0)
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do idf=idfmin,idfmax,idfstp
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do istart=ibmin,ibmax,ibstp
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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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idfbest=idf
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endif
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enddo
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enddo
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call timer('sync4d ',1)
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enddo
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call timer('sync4d ',1)
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enddo
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if(smax.lt.0.7) cycle
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f0=f0+real(idfbest)
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if( f0.le.10.0 .or. f0.ge.4990.0 ) cycle
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call timer('ft4down ',0)
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call ft4_downsample(dd,dobigfft,f0,cb) !Final downsample, corrected f0
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call timer('ft4down ',1)
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sum2=sum(abs(cb)**2)/(real(NSS)*NN)
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if(sum2.gt.0.0) cb=cb/sqrt(sum2)
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cd=0.
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if(ibest.ge.0) then
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it=min(NDMAX-1,ibest+NN*NSS-1)
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np=it-ibest+1
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cd(0:np-1)=cb(ibest:it)
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else
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cd(-ibest:ibest+NN*NSS-1)=cb(0:NN*NSS+2*ibest-1)
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endif
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call timer('bitmet ',0)
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call get_ft4_bitmetrics(cd,bitmetrics,badsync)
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call timer('bitmet ',1)
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if(badsync) cycle
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hbits=0
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where(bitmetrics(:,1).ge.0) hbits=1
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ns1=count(hbits( 1: 8).eq.(/0,0,0,1,1,0,1,1/))
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ns2=count(hbits( 67: 74).eq.(/0,1,0,0,1,1,1,0/))
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ns3=count(hbits(133:140).eq.(/1,1,1,0,0,1,0,0/))
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ns4=count(hbits(199:206).eq.(/1,0,1,1,0,0,0,1/))
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nsync_qual=ns1+ns2+ns3+ns4
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if(nsync_qual.lt. 20) cycle
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scalefac=2.83
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llra( 1: 58)=bitmetrics( 9: 66, 1)
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llra( 59:116)=bitmetrics( 75:132, 1)
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llra(117:174)=bitmetrics(141:198, 1)
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llra=scalefac*llra
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llrb( 1: 58)=bitmetrics( 9: 66, 2)
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llrb( 59:116)=bitmetrics( 75:132, 2)
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llrb(117:174)=bitmetrics(141:198, 2)
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llrb=scalefac*llrb
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llrc( 1: 58)=bitmetrics( 9: 66, 3)
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llrc( 59:116)=bitmetrics( 75:132, 3)
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llrc(117:174)=bitmetrics(141:198, 3)
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llrc=scalefac*llrc
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apmag=maxval(abs(llra))*1.1
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npasses=3+nappasses(nQSOProgress)
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if(lapcqonly) npasses=4
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if(ndepth.eq.1) npasses=3
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if(ncontest.ge.5) npasses=3 ! Don't support Fox and Hound
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do ipass=1,npasses
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if(ipass.eq.1) llr=llra
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if(ipass.eq.2) llr=llrb
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if(ipass.eq.3) llr=llrc
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if(ipass.le.3) then
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apmask=0
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iaptype=0
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if(iseg.eq.1) smax1=smax
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if(smax.lt.0.7) cycle
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if(iseg.gt.1 .and. smax.lt.smax1) cycle
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f1=f0+real(idfbest)
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if( f1.le.10.0 .or. f1.ge.4990.0 ) cycle
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call timer('ft4down ',0)
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call ft4_downsample(dd,dobigfft,f1,cb) !Final downsample, corrected f0
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call timer('ft4down ',1)
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sum2=sum(abs(cb)**2)/(real(NSS)*NN)
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if(sum2.gt.0.0) cb=cb/sqrt(sum2)
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cd=0.
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if(ibest.ge.0) then
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it=min(NDMAX-1,ibest+NN*NSS-1)
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np=it-ibest+1
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cd(0:np-1)=cb(ibest:it)
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else
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cd(-ibest:ibest+NN*NSS-1)=cb(0:NN*NSS+2*ibest-1)
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endif
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call timer('bitmet ',0)
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call get_ft4_bitmetrics(cd,bitmetrics,badsync)
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call timer('bitmet ',1)
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if(badsync) cycle
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hbits=0
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where(bitmetrics(:,1).ge.0) hbits=1
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ns1=count(hbits( 1: 8).eq.(/0,0,0,1,1,0,1,1/))
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ns2=count(hbits( 67: 74).eq.(/0,1,0,0,1,1,1,0/))
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ns3=count(hbits(133:140).eq.(/1,1,1,0,0,1,0,0/))
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ns4=count(hbits(199:206).eq.(/1,0,1,1,0,0,0,1/))
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nsync_qual=ns1+ns2+ns3+ns4
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if(nsync_qual.lt. 20) cycle
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if(ipass .gt. 3) then
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llrd=llra
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iaptype=naptypes(nQSOProgress,ipass-3)
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if(lapcqonly) iaptype=1
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scalefac=2.83
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llra( 1: 58)=bitmetrics( 9: 66, 1)
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llra( 59:116)=bitmetrics( 75:132, 1)
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llra(117:174)=bitmetrics(141:198, 1)
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llra=scalefac*llra
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llrb( 1: 58)=bitmetrics( 9: 66, 2)
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llrb( 59:116)=bitmetrics( 75:132, 2)
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llrb(117:174)=bitmetrics(141:198, 2)
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llrb=scalefac*llrb
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llrc( 1: 58)=bitmetrics( 9: 66, 3)
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llrc( 59:116)=bitmetrics( 75:132, 3)
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llrc(117:174)=bitmetrics(141:198, 3)
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llrc=scalefac*llrc
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apmag=maxval(abs(llra))*1.1
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npasses=3+nappasses(nQSOProgress)
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if(lapcqonly) npasses=4
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if(ndepth.eq.1) npasses=3
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if(ncontest.ge.5) npasses=3 ! Don't support Fox and Hound
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do ipass=1,npasses
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if(ipass.eq.1) llr=llra
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if(ipass.eq.2) llr=llrb
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if(ipass.eq.3) llr=llrc
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if(ipass.le.3) then
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apmask=0
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iaptype=0
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endif
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if(ipass .gt. 3) then
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llrd=llra
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iaptype=naptypes(nQSOProgress,ipass-3)
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if(lapcqonly) iaptype=1
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! ncontest=0 : NONE
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! 1 : NA_VHF
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@ -340,109 +354,111 @@ contains
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! 6 : HOUND
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!
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! Conditions that cause us to bail out of AP decoding
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napwid=50
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if(ncontest.le.4 .and. iaptype.ge.3 .and. (abs(f0-nfqso).gt.napwid) ) cycle
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if(iaptype.ge.2 .and. apbits(1).gt.1) cycle ! No, or nonstandard, mycall
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if(iaptype.ge.3 .and. apbits(30).gt.1) cycle ! No, or nonstandard, dxcall
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napwid=50
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if(ncontest.le.4 .and. iaptype.ge.3 .and. (abs(f1-nfqso).gt.napwid) ) cycle
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if(iaptype.ge.2 .and. apbits(1).gt.1) cycle ! No, or nonstandard, mycall
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if(iaptype.ge.3 .and. apbits(30).gt.1) cycle ! No, or nonstandard, dxcall
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if(iaptype.eq.1) then ! CQ or CQ TEST or CQ FD or CQ RU or CQ SCC
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apmask=0
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apmask(1:29)=1
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llrd(1:29)=apmag*mcq(1:29)
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endif
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if(iaptype.eq.2) then ! MyCall,???,???
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apmask=0
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if(ncontest.eq.0.or.ncontest.eq.1) then
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if(iaptype.eq.1) then ! CQ or CQ TEST or CQ FD or CQ RU or CQ SCC
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apmask=0
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apmask(1:29)=1
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llrd(1:29)=apmag*apbits(1:29)
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else if(ncontest.eq.2) then
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apmask(1:28)=1
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llrd(1:28)=apmag*apbits(1:28)
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else if(ncontest.eq.3) then
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apmask(1:28)=1
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llrd(1:28)=apmag*apbits(1:28)
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else if(ncontest.eq.4) then
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apmask(2:29)=1
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llrd(2:29)=apmag*apmy_ru(1:28)
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llrd(1:29)=apmag*mcq(1:29)
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endif
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endif
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if(iaptype.eq.3) then ! MyCall,DxCall,???
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apmask=0
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if(ncontest.eq.0.or.ncontest.eq.1.or.ncontest.eq.2) then
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apmask(1:58)=1
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llrd(1:58)=apmag*apbits(1:58)
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else if(ncontest.eq.3) then ! Field Day
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apmask(1:56)=1
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llrd(1:28)=apmag*apbits(1:28)
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llrd(29:56)=apmag*aphis_fd(1:28)
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else if(ncontest.eq.4) then ! RTTY RU
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apmask(2:57)=1
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llrd(2:29)=apmag*apmy_ru(1:28)
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llrd(30:57)=apmag*apbits(30:57)
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if(iaptype.eq.2) then ! MyCall,???,???
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apmask=0
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if(ncontest.eq.0.or.ncontest.eq.1) then
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apmask(1:29)=1
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llrd(1:29)=apmag*apbits(1:29)
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else if(ncontest.eq.2) then
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apmask(1:28)=1
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llrd(1:28)=apmag*apbits(1:28)
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else if(ncontest.eq.3) then
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apmask(1:28)=1
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llrd(1:28)=apmag*apbits(1:28)
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else if(ncontest.eq.4) then
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apmask(2:29)=1
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llrd(2:29)=apmag*apmy_ru(1:28)
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endif
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endif
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endif
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if(iaptype.eq.4 .or. iaptype.eq.5 .or. iaptype.eq.6) then
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apmask=0
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if(ncontest.le.4) then
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apmask(1:91)=1 ! mycall, hiscall, RRR|73|RR73
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if(iaptype.eq.6) llrd(1:91)=apmag*apbits(1:91)
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if(iaptype.eq.3) then ! MyCall,DxCall,???
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apmask=0
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if(ncontest.eq.0.or.ncontest.eq.1.or.ncontest.eq.2) then
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apmask(1:58)=1
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llrd(1:58)=apmag*apbits(1:58)
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else if(ncontest.eq.3) then ! Field Day
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apmask(1:56)=1
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llrd(1:28)=apmag*apbits(1:28)
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llrd(29:56)=apmag*aphis_fd(1:28)
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else if(ncontest.eq.4) then ! RTTY RU
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apmask(2:57)=1
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llrd(2:29)=apmag*apmy_ru(1:28)
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llrd(30:57)=apmag*apbits(30:57)
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endif
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endif
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if(iaptype.eq.4 .or. iaptype.eq.5 .or. iaptype.eq.6) then
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apmask=0
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if(ncontest.le.4) then
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apmask(1:91)=1 ! mycall, hiscall, RRR|73|RR73
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if(iaptype.eq.6) llrd(1:91)=apmag*apbits(1:91)
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endif
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endif
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llr=llrd
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endif
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message77=0
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dmin=0.0
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call timer('bpdec174',0)
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call bpdecode174_91(llr,apmask,max_iterations,message77, &
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cw,nharderror,niterations)
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call timer('bpdec174',1)
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if(doosd .and. nharderror.lt.0) then
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ndeep=3
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! if(abs(nfqso-f1).le.napwid) then
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! ndeep=4
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! endif
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call timer('osd174_91 ',0)
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call osd174_91(llr,apmask,ndeep,message77,cw,nharderror,dmin)
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||||
call timer('osd174_91 ',1)
|
||||
endif
|
||||
|
||||
llr=llrd
|
||||
endif
|
||||
message77=0
|
||||
dmin=0.0
|
||||
call timer('bpdec174',0)
|
||||
call bpdecode174_91(llr,apmask,max_iterations,message77, &
|
||||
cw,nharderror,niterations)
|
||||
call timer('bpdec174',1)
|
||||
|
||||
if(doosd .and. nharderror.lt.0) then
|
||||
ndeep=3
|
||||
if(abs(nfqso-f0).le.napwid) then
|
||||
ndeep=4
|
||||
if(sum(message77).eq.0) cycle
|
||||
if( nharderror.ge.0 ) then
|
||||
message77=mod(message77+rvec,2) ! remove rvec scrambling
|
||||
write(c77,'(77i1)') message77(1:77)
|
||||
call unpack77(c77,1,message,unpk77_success)
|
||||
if(unpk77_success.and.dosubtract) then
|
||||
call get_ft4_tones_from_77bits(message77,i4tone)
|
||||
dt=real(ibest)/666.67
|
||||
call timer('subtract',0)
|
||||
call subtractft4(dd,i4tone,f1,dt)
|
||||
call timer('subtract',1)
|
||||
endif
|
||||
idupe=0
|
||||
do i=1,ndecodes
|
||||
if(decodes(i).eq.message) idupe=1
|
||||
enddo
|
||||
if(idupe.eq.1) exit
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
if(snr.gt.0.0) then
|
||||
xsnr=10*log10(snr)-14.8
|
||||
else
|
||||
xsnr=-21.0
|
||||
endif
|
||||
nsnr=nint(max(-21.0,xsnr))
|
||||
xdt=ibest/666.67 - 0.5
|
||||
!write(21,'(i6.6,i5,2x,f4.1,i6,2x,a37,2x,f4.1,3i3,f5.1,i4,i4,i4)') &
|
||||
! nutc,nsnr,xdt,nint(f1),message,smax,iaptype,ipass,isp,dmin,nsync_qual,nharderror,iseg
|
||||
call this%callback(smax,nsnr,xdt,f1,message,iaptype,qual)
|
||||
exit
|
||||
endif
|
||||
call timer('osd174_91 ',0)
|
||||
call osd174_91(llr,apmask,ndeep,message77,cw,nharderror,dmin)
|
||||
call timer('osd174_91 ',1)
|
||||
endif
|
||||
|
||||
if(sum(message77).eq.0) cycle
|
||||
if( nharderror.ge.0 ) then
|
||||
message77=mod(message77+rvec,2) ! remove rvec scrambling
|
||||
write(c77,'(77i1)') message77(1:77)
|
||||
call unpack77(c77,1,message,unpk77_success)
|
||||
if(unpk77_success.and.dosubtract) then
|
||||
call get_ft4_tones_from_77bits(message77,i4tone)
|
||||
dt=real(ibest)/666.67
|
||||
call timer('subtract',0)
|
||||
call subtractft4(dd,i4tone,f0,dt)
|
||||
call timer('subtract',1)
|
||||
endif
|
||||
idupe=0
|
||||
do i=1,ndecodes
|
||||
if(decodes(i).eq.message) idupe=1
|
||||
enddo
|
||||
if(idupe.eq.1) exit
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
if(snr.gt.0.0) then
|
||||
xsnr=10*log10(snr)-14.8
|
||||
else
|
||||
xsnr=-21.0
|
||||
endif
|
||||
nsnr=nint(max(-21.0,xsnr))
|
||||
xdt=ibest/666.67 - 0.5
|
||||
!write(21,'(i6.6,i5,2x,f4.1,i6,2x,a37,2x,f4.1,3i3,f5.1,i4,i4)') &
|
||||
! nutc,nsnr,xdt,nint(f0),message,sync,iaptype,ipass,isp,dmin,nsync_qual,nharderror
|
||||
call this%callback(sync,nsnr,xdt,f0,message,iaptype,qual)
|
||||
exit
|
||||
endif
|
||||
enddo !Sequence estimation
|
||||
enddo !Sequence estimation
|
||||
if(nharderror.ge.0) exit
|
||||
enddo !3 DT segments
|
||||
enddo !Candidate list
|
||||
enddo !Subtraction loop
|
||||
return
|
||||
|
||||
Loading…
Reference in New Issue
Block a user