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FT4: Improve sync performance on disturbed channels. Make jt9 command-line option -d work

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This commit is contained in:
Steve Franke 2019-06-14 16:28:59 -05:00
parent fc07bd9287
commit 7e9cc9cbc7
3 changed files with 9 additions and 9 deletions
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10
lib/ft4/sync4d.f90
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@ -9,7 +9,6 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync)
complex csync2(2*NSS)
complex ctwk(2*NSS)
complex z1,z2,z3,z4
complex zz1,zz2,zz3,zz4
logical first
integer icos4a(0:3),icos4b(0:3),icos4c(0:3),icos4d(0:3)
data icos4a/0,1,3,2/
@ -19,7 +18,7 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync)
data first/.true./
save first,twopi,csynca,csyncb,csyncc,csyncd,fac
p(z1)=real(z1*fac)**2 + aimag(z1*fac)**2 !Statement function for power
p(z1)=sqrt(real(z1*fac)**2 + aimag(z1*fac)**2) !Statement function for power
if( first ) then
twopi=8.0*atan(1.0)
@ -60,11 +59,12 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync)
z4=0.
if(itwk.eq.1) csync2=ctwk*csynca !Tweak the frequency
z1=0.
if(i1.ge.0 .and. i1+4*NSS-1.le.NP-1) then
z1=sum(cd0(i1:i1+4*NSS-1:2)*conjg(csync2))
elseif( i1.lt.0 ) then
npts=(i1+4*NSS-1)/2
if(npts.le.8) then
if(npts.le.16) then
z1=0.
else
z1=sum(cd0(0:i1+4*NSS-1:2)*conjg(csync2(2*NSS-npts:)))
@ -78,16 +78,18 @@ subroutine sync4d(cd0,i0,ctwk,itwk,sync)
if(i3.ge.0 .and. i3+4*NSS-1.le.NP-1) z3=sum(cd0(i3:i3+4*NSS-1:2)*conjg(csync2))
if(itwk.eq.1) csync2=ctwk*csyncd !Tweak the frequency
z4=0.
if(i4.ge.0 .and. i4+4*NSS-1.le.NP-1) then
z4=sum(cd0(i4:i4+4*NSS-1:2)*conjg(csync2))
elseif( i4+4*NSS-1.gt.NP-1 ) then
npts=(NP-1-i4+1)/2
if(npts.le.8) then
if(npts.le.16) then
z4=0.
else
z4=sum(cd0(i4:i4+2*npts-1:2)*conjg(csync2(1:npts)))
endif
endif
sync = p(z1) + p(z2) + p(z3) + p(z4)
return

7
lib/ft4_decode.f90
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@ -285,12 +285,10 @@ contains
else
cd(-ibest:ibest+NN*NSS-1)=cb(0:NN*NSS+2*ibest-1)
endif
call timer('bitmet ',0)
call get_ft4_bitmetrics(cd,bitmetrics,badsync)
call timer('bitmet ',1)
if(badsync) cycle
hbits=0
where(bitmetrics(:,1).ge.0) hbits=1
ns1=count(hbits( 1: 8).eq.(/0,0,0,1,1,0,1,1/))
@ -405,7 +403,7 @@ contains
if(doosd .and. nharderror.lt.0) then
ndeep=3
if(abs(nfqso-f1).le.napwid) then
if(abs(nfqso-f0).le.napwid) then
ndeep=4
endif
call timer('osd174_91 ',0)
@ -439,7 +437,8 @@ contains
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)') nutc,nsnr,xdt,nint(f0),message,sync,iaptype,ipass,isp,dmin
!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

1
lib/jt9.f90
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@ -179,7 +179,6 @@ program jt9
go to 999
endif
if(mode.eq.5) ndepth=3
allocate(shared_data)
nflatten=0