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Added 2-symbol sequence detection for proof-of-concept tests.

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This commit is contained in:
Steve Franke 2018-06-22 11:20:28 -05:00
parent 3f8c218ebe
commit 0f5759270e
1 changed files with 90 additions and 19 deletions
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109
lib/ft8/ft8b_2.f90
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@ -13,26 +13,29 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
character*87 cbits
logical bcontest
real a(5)
real s1(0:7,ND),s2(0:7,NN),s1sort(8*ND)
real ps(0:7),psl(0:7)
real bmeta(3*ND),bmetb(3*ND),bmetap(3*ND)
real llra(3*ND),llrb(3*ND),llrd(3*ND) !Soft symbols
real s8d(0:7,ND),s8(0:7,NN),s8dsort(8*ND)
real s64(0:7,0:7)
real ps(0:63),psl(0:63)
real bmeta(3*ND),bmetb(3*ND),bmetc(3*ND),bmetap(3*ND)
real llra(3*ND),llrb(3*ND),llrc(3*ND),llrd(3*ND) !Soft symbols
real dd0(15*12000)
integer*1 message77(77),apmask(3*ND),cw(3*ND)
integer*1 msgbits(77)
integer apsym(77)
integer mcq(28),mde(28),mrrr(16),m73(16),mrr73(16)
integer itone(NN)
integer indxs1(8*ND)
integer indxs8d(8*ND)
integer icos7(0:6),ip(1)
integer nappasses(0:5) !Number of decoding passes to use for each QSO state
integer naptypes(0:5,4) ! (nQSOProgress, decoding pass) maximum of 4 passes for now
integer*1, target:: i1hiscall(12)
integer invgraymap(0:7)
complex cd0(3200)
complex ctwk(32)
complex csymb(32)
complex cs(0:7,NN)
logical first,newdat,lsubtract,lapon,lapcqonly,nagain
equivalence (s1,s1sort)
equivalence (s8d,s8dsort)
data icos7/3,1,4,0,6,5,2/ ! Flipped w.r.t. original FT8 sync array
data mcq/1,1,1,1,1,0,1,0,0,0,0,0,1,0,0,0,0,0,1,1,0,0,0,1,1,0,0,1/
data mrrr/0,1,1,1,1,1,1,0,1,1,0,0,1,1,1,1/
@ -40,6 +43,8 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
data mde/1,1,1,1,1,1,1,1,0,1,1,0,0,1,0,0,0,0,0,1,1,1,0,1,0,0,0,1/
data mrr73/0,0,0,0,0,0,1,0,0,0,0,1,0,1,0,1/
data first/.true./
data invgraymap/0,1,3,2,6,7,5,4/
save nappasses,naptypes
if(first) then
@ -123,31 +128,33 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
call sync8d(cd0,i0,ctwk,2,2,sync)
j=0
do k=1,NN
i1=ibest+(k-1)*32
csymb=cmplx(0.0,0.0)
if( i1.ge.1 .and. i1+31 .le. NP2 ) csymb=cd0(i1:i1+31)
call four2a(csymb,32,1,-1,1)
s2(0:7,k)=abs(csymb(1:8))/1e3
cs(0:7,k)=csymb(1:8)
s8(0:7,k)=abs(csymb(1:8))/1e3
enddo
! sync quality check
is1=0
is2=0
is3=0
do k=1,7
ip=maxloc(s2(:,k))
ip=maxloc(s8(:,k))
if(icos7(k-1).eq.(ip(1)-1)) is1=is1+1
ip=maxloc(s2(:,k+36))
ip=maxloc(s8(:,k+36))
if(icos7(k-1).eq.(ip(1)-1)) is2=is2+1
ip=maxloc(s2(:,k+72))
ip=maxloc(s8(:,k+72))
if(icos7(k-1).eq.(ip(1)-1)) is3=is3+1
enddo
! hard sync sum - max is 21
nsync=is1+is2+is3
if(nsync .le. 6) then ! bail out
nbadcrc=1
!write(*,*) 'failed sync sanity test'
return
endif
@ -157,19 +164,19 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
if(k.ge.37 .and. k.le.43) cycle
if(k.gt.72) cycle
j=j+1
s1(0:7,j)=s2(0:7,k)
s8d(0:7,j)=s8(0:7,k)
enddo
call indexx(s1sort,8*ND,indxs1)
xmeds1=s1sort(indxs1(nint(0.5*8*ND)))
s1=s1/xmeds1
call indexx(s8dsort,8*ND,indxs8d)
xmeds8d=s8dsort(indxs8d(nint(0.5*8*ND)))
s8d=s8d/xmeds8d
do j=1,ND
i4=3*j-2
i2=3*j-1
i1=3*j
! Max amplitude
ps=s1(0:7,j)
ps(0:7)=s8d(0:7,j)
! For Gray bit-to-symbol mapping
r1=max(ps(1),ps(2),ps(5),ps(6))-max(ps(0),ps(3),ps(4),ps(7))
r2=max(ps(2),ps(3),ps(4),ps(5))-max(ps(0),ps(1),ps(6),ps(7))
@ -188,13 +195,76 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
bmetb(i1)=r1
enddo
! Do 2-symbol detection
do ihalf=1,2
do k=1,29,2
if(ihalf.eq.1) ks=k+7
if(ihalf.eq.2) ks=k+43
amax=-1.0
do i=0,63
il=i/8
ir=iand(i,7)
s64(il,ir)=abs(cs(il,ks)+cs(ir,ks+1))
if(s64(il,ir).gt.amax) then
ilb=il
irb=ir
amax=s64(il,ir)
endif
enddo
!write(*,*) k,ilb,irb,amax
maxa0=maxval(s64(0:7,0))
maxa1=maxval(s64(0:7,1))
maxa2=maxval(s64(0:7,2))
maxa3=maxval(s64(0:7,3))
maxa4=maxval(s64(0:7,4))
maxa5=maxval(s64(0:7,5))
maxa6=maxval(s64(0:7,6))
maxa7=maxval(s64(0:7,7))
max0a=maxval(s64(0,0:7))
max1a=maxval(s64(1,0:7))
max2a=maxval(s64(2,0:7))
max3a=maxval(s64(3,0:7))
max4a=maxval(s64(4,0:7))
max5a=maxval(s64(5,0:7))
max6a=maxval(s64(6,0:7))
max7a=maxval(s64(7,0:7))
r1=max(maxa1,maxa2,maxa5,maxa6) - &
max(maxa0,maxa3,maxa4,maxa7)
r2=max(maxa2,maxa3,maxa4,maxa5) - &
max(maxa0,maxa1,maxa6,maxa7)
r4=max(maxa4,maxa5,maxa6,maxa7) - &
max(maxa0,maxa1,maxa2,maxa3)
r8=max(max1a,max2a,max5a,max6a) - &
max(max0a,max3a,max4a,max7a)
r16=max(max2a,max3a,max4a,max5a) - &
max(max0a,max1a,max6a,max7a)
r32=max(max4a,max5a,max6a,max7a) - &
max(max0a,max1a,max2a,max3a)
i32=1+(k-1)*3+(ihalf-1)*87
bmetc(i32)=r32
bmetc(i32+1)=r16
bmetc(i32+2)=r8
if(k.lt.29) then
bmetc(i32+3)=r4
bmetc(i32+4)=r2
bmetc(i32+5)=r1
endif
enddo
enddo
call normalizebmet(bmeta,3*ND)
call normalizebmet(bmetb,3*ND)
call normalizebmet(bmetc,3*ND)
bmetap=bmeta
!do i=1,174
!write(*,*) i,bmeta(i),bmetc(i)
!enddo
scalefac=2.83
llra=scalefac*bmeta
llrb=scalefac*bmetb
llrc=scalefac*bmetc
apmag=scalefac*(maxval(abs(bmetap))*1.01)
! pass #
@ -221,7 +291,8 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
! do ipass=1,2
llrd=llra
if(ipass.eq.2) llrd=llrb
if(ipass.eq.3) llrd(1:24)=0.
! if(ipass.eq.3) llrd(1:24)=0.
if(ipass.eq.3) llrd=llrc
if(ipass.eq.4) llrd(1:48)=0.
if(ipass.le.4) then
apmask=0
@ -296,9 +367,9 @@ subroutine ft8b_2(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
xsig=0.0
xnoi=0.0
do i=1,79
xsig=xsig+s2(itone(i),i)**2
xsig=xsig+s8(itone(i),i)**2
ios=mod(itone(i)+4,7)
xnoi=xnoi+s2(ios,i)**2
xnoi=xnoi+s8(ios,i)**2
enddo
xsnr=0.001
if(xnoi.gt.0 .and. xnoi.lt.xsig) xsnr=xsig/xnoi-1.0