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Change sync word to 4 concatenated 4x4 Costas arrays. Tweaks to optimize sync efficiency.

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This commit is contained in:
Steven Franke 2020-04-07 13:18:41 -05:00
parent 1044342245
commit e972fbbfec
2 changed files with 46 additions and 55 deletions
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11
lib/fsk4hf/genwsprcpm.f90
View File

@ -16,13 +16,15 @@ subroutine genwsprcpm(msg,msgsent,itone)
integer icw(ND)
integer id(NS+ND)
integer jd(NS+ND)
integer ipreamble(16) !Freq estimation preamble
! integer ipreamble(16) !Freq estimation preamble
integer isyncword(16)
integer isync(200) !Long sync vector
integer itone(NN)
data cseq /'9D9F C48B 797A DD60 58CB 2EBC 6'/
data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
! data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
data isyncword/0,1,3,2,1,0,2,3,2,3,1,0,3,2,0,1/
data first/.true./
save first,isync,ipreamble
save first,isync,ipreamble,isyncword
if(first) then
k=0
@ -65,9 +67,10 @@ subroutine genwsprcpm(msg,msgsent,itone)
! Message structure:
! d100 p16 d100
itone(1:100)=isync(1:100)+2*codeword(1:100)
itone(101:116)=ipreamble+1
itone(101:116)=isyncword
itone(117:216)=isync(101:200)+2*codeword(101:200)
itone=2*itone-3
return
end subroutine genwsprcpm

90
lib/fsk4hf/wsprcpmd.f90
View File

@ -36,13 +36,15 @@ program wsprcpmd
integer iuniqueword0
integer isync(200) !Unique word
integer isync2(216)
integer ipreamble(16) !Preamble vector
! integer ipreamble(16) !Preamble vector
integer isyncword(16)
integer ihdr(11)
integer*2 iwave(NMAX) !Generated full-length waveform
integer*1,target :: idat(9)
integer*1 decoded(68),apmask(204),cw(204)
integer*1 hbits(216),hbits1(216),hbits3(216)
data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
! data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
data isyncword/0,1,3,2,1,0,2,3,2,3,1,0,3,2,0,1/
data cseq /'9D9F C48B 797A DD60 58CB 2EBC 6'/
data iuniqueword0/z'30C9E8AD'/
@ -95,9 +97,7 @@ program wsprcpmd
endif
isync2(1:100)=isync(1:100)
isync2(101:104)=0 ! This is *not* backwards.
isync2(105:112)=1
isync2(113:116)=0
isync2(101:116)=(/0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1/)
isync2(117:216)=isync(101:200)
! data MSB
@ -112,10 +112,8 @@ program wsprcpmd
if(j.eq.0) then
dphi0=-3*dphi
dphi1=+1*dphi
! dphi1=-1*dphi data LSB
else
dphi0=-1*dphi
! dphi0=+1*dphi data LSB
dphi1=+3*dphi
endif
phi0=0.0
@ -171,7 +169,7 @@ program wsprcpmd
fc0=candidates(icand,1)
xsnr=candidates(icand,2)
xmax=-1e32
do i=-5,5
do i=-7,7
ft=fc0+i*0.2
call noncoherent_frame_sync(c2,h,ft,isync2,is,xf1)
if(xf1.gt.xmax) then
@ -182,11 +180,11 @@ program wsprcpmd
enddo
fcest=fc1
imode=0 ! refine freq
call coherent_preamble_fsync(c2,h,ipreamble,nsync,NSPS,is0,fcest,imode,xp0)
call coherent_sync(c2,h,isyncword,nsync,NSPS,is0,fcest,imode,xp0)
imode=1 ! refine istart
istart=is0
call coherent_preamble_fsync(c2,h,ipreamble,nsync,NSPS,istart,fcest,imode,xp1)
! write(*,'(i5,i5,i5,6(f11.5,2x))') ifile,is0,istart,fc0,fc1,fcest,xf1,xp0,xp1
call coherent_sync(c2,h,isyncword,nsync,NSPS,istart,fcest,imode,xp1)
write(*,'(i5,i5,i5,6(f11.5,2x))') ifile-2,is0,istart,fc0,fc1,fcest,xf1,xp0,xp1
!genie sync
!istart=375
@ -257,7 +255,6 @@ program wsprcpmd
sbits=sbits3
hbits=hbits3
endif
! if( count(hbits(101:116).ne.ipreamble) .gt.7 ) cycle
rxdata(1:100)=sbits(1:100)
rxdata(101:200)=sbits(117:216);
@ -274,7 +271,7 @@ program wsprcpmd
ifer=0
call bpdecode204(llr,apmask,max_iterations,decoded,cw,nharderror,niterations)
nhardmin=-1
if(nharderror.lt.0) call osd204(llr,apmask,5,decoded,cw,nhardmin,dmin)
if(nharderror.lt.0) call osd204(llr,apmask,4,decoded,cw,nhardmin,dmin)
if(sum(decoded).eq.0) cycle
if(nhardmin.ge.0 .or. nharderror.ge.0) then
idat=0
@ -323,17 +320,17 @@ program wsprcpmd
999 end program wsprcpmd
subroutine coherent_preamble_fsync(c2,h,ipreamble,nsync,nsps,istart,fc,imode,xmax)
subroutine coherent_sync(c2,h,isyncword,nsync,nsps,istart,fc,imode,xmax)
! imode=0: refine fc using given istart
! imode=1: refine istart using given fc
complex c2(0:120*12000/32-1)
complex cpreamble(0:16*200-1)
complex csync(0:16*200-1)
complex ctmp1(0:4*16*200-1)
complex ctwkp(0:16*200-1)
complex ccohp(0:15)
integer ipreamble(nsync)
integer isyncword(nsync)
logical first/.true./
save dt,first,twopi,cpreamble
save dt,first,twopi,csync
if(first) then
baud=12000.0/6400.0
@ -343,10 +340,9 @@ subroutine coherent_preamble_fsync(c2,h,ipreamble,nsync,nsps,istart,fc,imode,xma
phi=0.0
dphi=twopi*baud*0.5*h*dt
do i=1,16
dp=dphi
if(ipreamble(i).eq.0) dp=-dphi
dp=dphi*2*(isyncword(i)-1.5)
do j=1,200
cpreamble(k)=cmplx(cos(phi),sin(phi))
csync(k)=cmplx(cos(phi),sin(phi))
phi=mod(phi+dp,twopi)
k=k+1
enddo
@ -357,7 +353,7 @@ subroutine coherent_preamble_fsync(c2,h,ipreamble,nsync,nsps,istart,fc,imode,xma
ctwkp=cmplx(0.0,0.0)
phi=0
do i=0,nsync*nsps-1
ctwkp(i)=cpreamble(i)*cmplx(cos(phi),sin(phi))
ctwkp(i)=csync(i)*cmplx(cos(phi),sin(phi))
phi=mod(phi+dphi,twopi)
enddo
ipstart=istart+100*200
@ -384,8 +380,10 @@ subroutine coherent_preamble_fsync(c2,h,ipreamble,nsync,nsps,istart,fc,imode,xma
xmax=0.0
ctmp1=cshift(ctmp1,-200)
dfp=1/(4*6400.0/12000.0*16)
do i=150,250
! do i=150,250
do i=190,210
xa=abs(ctmp1(i))
!write(51,*) (i-200)*dfp,xa
if(xa.gt.xmax) then
ishift=i
xmax=xa
@ -399,7 +397,7 @@ subroutine coherent_preamble_fsync(c2,h,ipreamble,nsync,nsps,istart,fc,imode,xma
delta2=delta+xint*dfp/2.0
fc=fc+delta2
return
end subroutine coherent_preamble_fsync
end subroutine coherent_sync
subroutine noncoherent_frame_sync(c2,h,fc,isync2,istart,ssmax)
complex c2(0:120*12000/32-1)
@ -432,39 +430,30 @@ subroutine noncoherent_frame_sync(c2,h,fc,isync2,istart,ssmax)
th2=mod(th2+dp2,twopi)
th3=mod(th3+dp3,twopi)
enddo
ss=0.0
avp=0.0
xc=0.0
xs=0.0
xn=0.0
do is=1,216
i0=izero+it+(is-1)*200
p0=abs(sum(c2(i0:i0+199)*conjg(ct0)))
p1=abs(sum(c2(i0:i0+199)*conjg(ct1)))
p2=abs(sum(c2(i0:i0+199)*conjg(ct2)))
p3=abs(sum(c2(i0:i0+199)*conjg(ct3)))
p0=sqrt(p0)
p1=sqrt(p1)
p2=sqrt(p2)
p3=sqrt(p3)
if(is.le.100 .or. is.ge.117) then
if(isync2(is).eq.0) then
xc=xc+max(p0,p2)
avp=avp+(p1+p3)/2.0
elseif(isync2(is).eq.1) then
xc=xc+max(p1,p3)
avp=avp+(p2+p4)/2.0
endif
else
if(isync2(is).eq.0) then
xc=xc+p2
avp=avp+(p0+p1+p3)/3.0
elseif(isync2(is).eq.1) then
xc=xc+p1
avp=avp+(p0+p2+p4)/3.0
endif
p0=p0**2
p1=p1**2
p2=p2**2
p3=p3**2
if(isync2(is).eq.0) then
! xs=xs+(p0+p2)/2.0
xs=xs+max(p0,p2)
xn=xn+(p1+p3)/2.0
elseif(isync2(is).eq.1) then
! xs=xs+(p1+p3)/2.0
xs=xs+max(p1,p3)
xn=xn+(p0+p2)/2.0
endif
enddo
sy=xc/avp
sy=xs/xn
!write(41,*) it,sy
if(sy.gt.ssmax) then
ioffset=it
ssmax=sy
@ -530,7 +519,7 @@ subroutine getcandidate2(c,npts,fs,fa,fb,ncand,candidates)
df=10*fs/NFFT1
csfil=cmplx(0.0,0.0)
do i=0,NFFT2-1
csfil(i)=exp(-((i-NH2)/20.0)**2) ! revisit this
csfil(i)=exp(-((i-NH2)/32.0)**2) ! revisit this
enddo
csfil=cshift(csfil,NH2)
call four2a(csfil,NFFT2,1,-1,1)
@ -555,10 +544,9 @@ subroutine getcandidate2(c,npts,fs,fa,fb,ncand,candidates)
bigspec=bigspec/xn
ncand=0
do i=il,ih
write(21,*) i*df,bigspec(i)
if((bigspec(i).gt.bigspec(i-1)).and. &
(bigspec(i).gt.bigspec(i+1)).and. &
(bigspec(i).gt.1.15).and.ncand.lt.100) then
(bigspec(i).gt.1.12).and.ncand.lt.100) then
ncand=ncand+1
candidates(ncand,1)=df*(i-NH2)
candidates(ncand,2)=10*log10(bigspec(i)-1)-26.0