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https://github.com/saitohirga/WSJT-X.git
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467 lines
17 KiB
Fortran
467 lines
17 KiB
Fortran
module ft4_decode
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type :: ft4_decoder
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procedure(ft4_decode_callback), pointer :: callback
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contains
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procedure :: decode
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end type ft4_decoder
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abstract interface
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subroutine ft4_decode_callback (this,sync,snr,dt,freq,decoded,nap,qual)
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import ft4_decoder
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implicit none
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class(ft4_decoder), intent(inout) :: this
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real, intent(in) :: sync
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integer, intent(in) :: snr
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real, intent(in) :: dt
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real, intent(in) :: freq
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character(len=37), intent(in) :: decoded
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integer, intent(in) :: nap
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real, intent(in) :: qual
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end subroutine ft4_decode_callback
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end interface
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contains
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subroutine decode(this,callback,iwave,nQSOProgress,nfqso, &
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nutc,nfa,nfb,ndepth,lapcqonly,ncontest,mycall,hiscall)
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use timer_module, only: timer
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use packjt77
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include 'ft4/ft4_params.f90'
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class(ft4_decoder), intent(inout) :: this
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procedure(ft4_decode_callback) :: callback
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parameter (NSS=NSPS/NDOWN,NDMAX=NMAX/NDOWN)
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character message*37,msgsent*37
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character c77*77
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character*37 decodes(100)
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character*17 cdatetime0
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character*12 mycall,hiscall
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character*12 mycall0,hiscall0
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character*6 hhmmss
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character*4 cqstr,cqstr0
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complex cd2(0:NDMAX-1) !Complex waveform
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complex cb(0:NDMAX-1)
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complex cd(0:NN*NSS-1) !Complex waveform
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complex ctwk(2*NSS),ctwk2(2*NSS,-16:16)
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real a(5)
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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(2,100)
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real savg(NH1),sbase(NH1)
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integer apbits(2*ND)
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integer apmy_ru(28),aphis_fd(28)
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integer*2 iwave(NMAX) !Raw received data
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integer*1 message77(77),rvec(77),apmask(2*ND),cw(2*ND)
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integer*1 hbits(2*NN)
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integer i4tone(103)
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integer nappasses(0:5) ! # of decoding passes for QSO States 0-5
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integer naptypes(0:5,4) ! nQSOProgress, decoding pass
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integer mcq(29)
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integer mrrr(19),m73(19),mrr73(19)
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logical nohiscall,unpk77_success
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logical first, dobigfft
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logical dosubtract,doosd
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logical badsync
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logical, intent(in) :: lapcqonly
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data first/.true./
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data mcq/0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0/
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data mrrr/0,1,1,1,1,1,1,0,1,0,0,1,0,0,1,0,0,0,1/
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data m73/0,1,1,1,1,1,1,0,1,0,0,1,0,1,0,0,0,0,1/
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data mrr73/0,1,1,1,1,1,1,0,0,1,1,1,0,1,0,1,0,0,1/
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data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
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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,first,apbits,nappasses,naptypes, &
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mycall0,hiscall0,cqstr0,ctwk2
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this%callback => callback
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hhmmss=cdatetime0(8:13)
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dxcall13=hiscall
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mycall13=mycall
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if(first) then
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fs=12000.0/NDOWN !Sample rate after downsampling
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dt=1/fs !Sample interval after downsample (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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txt=NZ*dt !Transmission length (s) without ramp up/down
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twopi=8.0*atan(1.0)
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h=1.0
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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 twkfreq1(ctwk,2*NSS,fs/2.0,a,ctwk2(:,idf))
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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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nappasses(0)=2
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nappasses(1)=2
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nappasses(2)=2
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nappasses(3)=2
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nappasses(4)=2
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nappasses(5)=3
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! iaptype
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!------------------------
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! 1 CQ ??? ??? (29 ap bits)
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! 2 MyCall ??? ??? (29 ap bits)
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! 3 MyCall DxCall ??? (58 ap bits)
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! 4 MyCall DxCall RRR (77 ap bits)
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! 5 MyCall DxCall 73 (77 ap bits)
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! 6 MyCall DxCall RR73 (77 ap bits)
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!********
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naptypes(0,1:4)=(/1,2,0,0/) ! Tx6 selected (CQ)
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naptypes(1,1:4)=(/2,3,0,0/) ! Tx1
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naptypes(2,1:4)=(/2,3,0,0/) ! Tx2
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naptypes(3,1:4)=(/3,6,0,0/) ! Tx3
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naptypes(4,1:4)=(/3,6,0,0/) ! Tx4
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naptypes(5,1:4)=(/3,1,2,0/) ! Tx5
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mycall0=''
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hiscall0=''
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cqstr0=''
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first=.false.
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endif
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if(cqstr.ne.cqstr0) then
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i0=index(cqstr,' ')
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if(i0.le.1) then
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message='CQ A1AA AA01'
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else
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message='CQ '//cqstr(1:i0-1)//' A1AA AA01'
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endif
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i3=-1
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n3=-1
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call pack77(message,i3,n3,c77)
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call unpack77(c77,1,msgsent,unpk77_success)
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read(c77,'(29i1)') mcq
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mcq=2*mod(mcq+rvec(1:29),2)-1
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cqstr0=cqstr
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endif
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l1=index(mycall,char(0))
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if(l1.ne.0) mycall(l1:)=" "
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l1=index(hiscall,char(0))
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if(l1.ne.0) hiscall(l1:)=" "
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if(mycall.ne.mycall0 .or. hiscall.ne.hiscall0) then
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apbits=0
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apbits(1)=99
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apbits(30)=99
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apmy_ru=0
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aphis_fd=0
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if(len(trim(mycall)) .lt. 3) go to 10
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nohiscall=.false.
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hiscall0=hiscall
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if(len(trim(hiscall0)).lt.3) then
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hiscall0=mycall ! use mycall for dummy hiscall - mycall won't be hashed.
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nohiscall=.true.
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endif
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message=trim(mycall)//' '//trim(hiscall0)//' RR73'
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i3=-1
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n3=-1
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call pack77(message,i3,n3,c77)
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call unpack77(c77,1,msgsent,unpk77_success)
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if(i3.ne.1 .or. (message.ne.msgsent) .or. .not.unpk77_success) go to 10
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read(c77,'(77i1)') message77
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apmy_ru=2*mod(message77(1:28)+rvec(2:29),2)-1
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aphis_fd=2*mod(message77(30:57)+rvec(29:56),2)-1
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message77=mod(message77+rvec,2)
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call encode174_91(message77,cw)
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apbits=2*cw-1
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if(nohiscall) apbits(30)=99
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10 continue
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mycall0=mycall
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hiscall0=hiscall
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endif
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maxcand=100
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ndecodes=0
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decodes=' '
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fa=nfa
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fb=nfb
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dd=iwave
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! ndepth=3: 3 passes, bp+osd
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! ndepth=2: 3 passes, bp only
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! ndepth=1: 1 pass, no subtraction
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max_iterations=40
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syncmin=1.2
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dosubtract=.true.
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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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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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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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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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endif
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candidate=0.0
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ncand=0
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call timer('getcand4',0)
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call getcandidates4(dd,fa,fb,syncmin,nfqso,maxcand,savg,candidate, &
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ncand,sbase)
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call timer('getcand4',1)
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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(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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if(dobigfft) dobigfft=.false.
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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 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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if(iseg.eq.1) smax1=smax
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if(smax.lt.1.2) 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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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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! 2 : EU_VHF
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! 3 : FIELD DAY
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! 4 : RTTY
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! 5 : FOX
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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(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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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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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(1:77)=1 ! mycall, hiscall, RRR|73|RR73
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if(iaptype.eq.6) llrd(1:77)=apmag*apbits(1:77)
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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)
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endif
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if(sum(message77).eq.0) cycle
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if( nharderror.ge.0 ) then
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message77=mod(message77+rvec,2) ! remove rvec scrambling
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write(c77,'(77i1)') message77(1:77)
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call unpack77(c77,1,message,unpk77_success)
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if(unpk77_success.and.dosubtract) then
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call get_ft4_tones_from_77bits(message77,i4tone)
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dt=real(ibest)/666.67
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call timer('subtract',0)
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call subtractft4(dd,i4tone,f1,dt)
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call timer('subtract',1)
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endif
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idupe=0
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do i=1,ndecodes
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if(decodes(i).eq.message) idupe=1
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enddo
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if(idupe.eq.1) exit
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ndecodes=ndecodes+1
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decodes(ndecodes)=message
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if(snr.gt.0.0) then
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xsnr=10*log10(snr)-14.8
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else
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xsnr=-21.0
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endif
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nsnr=nint(max(-21.0,xsnr))
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xdt=ibest/666.67 - 0.5
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!write(21,'(i6.6,i5,2x,f4.1,i6,2x,a37,2x,f4.1,3i3,f5.1,i4,i4,i4)') &
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! nutc,nsnr,xdt,nint(f1),message,smax,iaptype,ipass,isp,dmin,nsync_qual,nharderror,iseg
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call this%callback(smax,nsnr,xdt,f1,message,iaptype,qual)
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exit
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endif
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enddo !Sequence estimation
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if(nharderror.ge.0) exit
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enddo !3 DT segments
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enddo !Candidate list
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enddo !Subtraction loop
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return
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end subroutine decode
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end module ft4_decode
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