mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-11-03 21:40:52 -05:00
468 lines
17 KiB
Fortran
468 lines
17 KiB
Fortran
module ft4_decode
|
|
|
|
type :: ft4_decoder
|
|
procedure(ft4_decode_callback), pointer :: callback
|
|
contains
|
|
procedure :: decode
|
|
end type ft4_decoder
|
|
|
|
abstract interface
|
|
subroutine ft4_decode_callback (this,sync,snr,dt,freq,decoded,nap,qual)
|
|
import ft4_decoder
|
|
implicit none
|
|
class(ft4_decoder), intent(inout) :: this
|
|
real, intent(in) :: sync
|
|
integer, intent(in) :: snr
|
|
real, intent(in) :: dt
|
|
real, intent(in) :: freq
|
|
character(len=37), intent(in) :: decoded
|
|
integer, intent(in) :: nap
|
|
real, intent(in) :: qual
|
|
end subroutine ft4_decode_callback
|
|
end interface
|
|
|
|
contains
|
|
|
|
subroutine decode(this,callback,iwave,nQSOProgress,nfqso, &
|
|
nfa,nfb,ndepth,lapcqonly,ncontest,mycall,hiscall)
|
|
use timer_module, only: timer
|
|
use packjt77
|
|
include 'ft4/ft4_params.f90'
|
|
parameter (MAXCAND=100)
|
|
class(ft4_decoder), intent(inout) :: this
|
|
procedure(ft4_decode_callback) :: callback
|
|
parameter (NSS=NSPS/NDOWN,NDMAX=NMAX/NDOWN)
|
|
character message*37,msgsent*37
|
|
character c77*77
|
|
character*37 decodes(100)
|
|
character*17 cdatetime0
|
|
character*12 mycall,hiscall
|
|
character*12 mycall0,hiscall0
|
|
character*6 hhmmss
|
|
|
|
complex cd2(0:NDMAX-1) !Complex waveform
|
|
complex cb(0:NDMAX-1)
|
|
complex cd(0:NN*NSS-1) !Complex waveform
|
|
complex ctwk(2*NSS),ctwk2(2*NSS,-16:16)
|
|
|
|
real a(5)
|
|
real bitmetrics(2*NN,3)
|
|
real dd(NMAX)
|
|
real llr(2*ND),llra(2*ND),llrb(2*ND),llrc(2*ND),llrd(2*ND)
|
|
real candidate(2,MAXCAND)
|
|
real savg(NH1),sbase(NH1)
|
|
|
|
integer apbits(2*ND)
|
|
integer apmy_ru(28),aphis_fd(28)
|
|
integer*2 iwave(NMAX) !Raw received data
|
|
integer*1 message77(77),rvec(77),apmask(2*ND),cw(2*ND)
|
|
integer*1 message91(91)
|
|
integer*1 hbits(2*NN)
|
|
integer i4tone(103)
|
|
integer nappasses(0:5) ! # of decoding passes for QSO States 0-5
|
|
integer naptypes(0:5,4) ! nQSOProgress, decoding pass
|
|
integer mcq(29),mcqru(29),mcqfd(29),mcqtest(29),mcqww(29)
|
|
integer mrrr(19),m73(19),mrr73(19)
|
|
|
|
logical nohiscall,unpk77_success
|
|
logical first, dobigfft
|
|
logical dosubtract,doosd
|
|
logical badsync
|
|
logical, intent(in) :: lapcqonly
|
|
|
|
data first/.true./
|
|
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/
|
|
data mcqru/0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,1,1,0,0,1,1,0,0/
|
|
data mcqfd/0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,1,0,0,0,1,0/
|
|
data mcqtest/0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,1,0,1,0,1,1,1,1,1,1,0,0,1,0/
|
|
data mcqww/0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,1,0,1,1,1,1,0/
|
|
data mrrr/0,1,1,1,1,1,1,0,1,0,0,1,0,0,1,0,0,0,1/
|
|
data m73/0,1,1,1,1,1,1,0,1,0,0,1,0,1,0,0,0,0,1/
|
|
data mrr73/0,1,1,1,1,1,1,0,0,1,1,1,0,1,0,1,0,0,1/
|
|
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, &
|
|
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, &
|
|
0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
|
|
save fs,dt,tt,txt,twopi,h,first,apbits,nappasses,naptypes, &
|
|
mycall0,hiscall0,ctwk2
|
|
|
|
this%callback => callback
|
|
hhmmss=cdatetime0(8:13)
|
|
dxcall13=hiscall ! initialize for use in packjt77
|
|
mycall13=mycall
|
|
|
|
smax1=0.
|
|
nd1=0
|
|
|
|
if(first) then
|
|
fs=12000.0/NDOWN !Sample rate after downsampling
|
|
dt=1/fs !Sample interval after downsample (s)
|
|
tt=NSPS*dt !Duration of "itone" symbols (s)
|
|
txt=NZ*dt !Transmission length (s) without ramp up/down
|
|
twopi=8.0*atan(1.0)
|
|
h=1.0
|
|
|
|
do idf=-16,16
|
|
a=0.
|
|
a(1)=real(idf)
|
|
ctwk=1.
|
|
call twkfreq1(ctwk,2*NSS,fs/2.0,a,ctwk2(:,idf))
|
|
enddo
|
|
|
|
mcq=2*mod(mcq+rvec(1:29),2)-1
|
|
mcqru=2*mod(mcqru+rvec(1:29),2)-1
|
|
mcqfd=2*mod(mcqfd+rvec(1:29),2)-1
|
|
mcqtest=2*mod(mcqtest+rvec(1:29),2)-1
|
|
mcqww=2*mod(mcqww+rvec(1:29),2)-1
|
|
mrrr=2*mod(mrrr+rvec(59:77),2)-1
|
|
m73=2*mod(m73+rvec(59:77),2)-1
|
|
mrr73=2*mod(mrr73+rvec(59:77),2)-1
|
|
nappasses(0)=2
|
|
nappasses(1)=2
|
|
nappasses(2)=2
|
|
nappasses(3)=2
|
|
nappasses(4)=2
|
|
nappasses(5)=3
|
|
|
|
! iaptype
|
|
!------------------------
|
|
! 1 CQ ??? ??? (29 ap bits)
|
|
! 2 MyCall ??? ??? (29 ap bits)
|
|
! 3 MyCall DxCall ??? (58 ap bits)
|
|
! 4 MyCall DxCall RRR (77 ap bits)
|
|
! 5 MyCall DxCall 73 (77 ap bits)
|
|
! 6 MyCall DxCall RR73 (77 ap bits)
|
|
!********
|
|
naptypes(0,1:4)=(/1,2,0,0/) ! Tx6 selected (CQ)
|
|
naptypes(1,1:4)=(/2,3,0,0/) ! Tx1
|
|
naptypes(2,1:4)=(/2,3,0,0/) ! Tx2
|
|
naptypes(3,1:4)=(/3,6,0,0/) ! Tx3
|
|
naptypes(4,1:4)=(/3,6,0,0/) ! Tx4
|
|
naptypes(5,1:4)=(/3,1,2,0/) ! Tx5
|
|
|
|
mycall0=''
|
|
hiscall0=''
|
|
first=.false.
|
|
endif
|
|
|
|
l1=index(mycall,char(0))
|
|
if(l1.ne.0) mycall(l1:)=" "
|
|
l1=index(hiscall,char(0))
|
|
if(l1.ne.0) hiscall(l1:)=" "
|
|
if(mycall.ne.mycall0 .or. hiscall.ne.hiscall0) then
|
|
apbits=0
|
|
apbits(1)=99
|
|
apbits(30)=99
|
|
apmy_ru=0
|
|
aphis_fd=0
|
|
|
|
if(len(trim(mycall)) .lt. 3) go to 10
|
|
|
|
nohiscall=.false.
|
|
hiscall0=hiscall
|
|
if(len(trim(hiscall0)).lt.3) then
|
|
hiscall0=mycall ! use mycall for dummy hiscall - mycall won't be hashed.
|
|
nohiscall=.true.
|
|
endif
|
|
message=trim(mycall)//' '//trim(hiscall0)//' RR73'
|
|
i3=-1
|
|
n3=-1
|
|
call pack77(message,i3,n3,c77)
|
|
call unpack77(c77,1,msgsent,unpk77_success)
|
|
if(i3.ne.1 .or. (message.ne.msgsent) .or. .not.unpk77_success) go to 10
|
|
read(c77,'(77i1)') message77
|
|
apmy_ru=2*mod(message77(1:28)+rvec(2:29),2)-1
|
|
aphis_fd=2*mod(message77(30:57)+rvec(29:56),2)-1
|
|
message77=mod(message77+rvec,2)
|
|
call encode174_91(message77,cw)
|
|
apbits=2*cw-1
|
|
if(nohiscall) apbits(30)=99
|
|
|
|
10 continue
|
|
mycall0=mycall
|
|
hiscall0=hiscall
|
|
endif
|
|
ndecodes=0
|
|
decodes=' '
|
|
fa=nfa
|
|
fb=nfb
|
|
dd=iwave
|
|
|
|
! ndepth=3: 3 passes, bp+osd
|
|
! ndepth=2: 3 passes, bp only
|
|
! ndepth=1: 1 pass, no subtraction
|
|
|
|
max_iterations=40
|
|
syncmin=1.2
|
|
dosubtract=.true.
|
|
doosd=.true.
|
|
nsp=3
|
|
if(ndepth.eq.2) then
|
|
doosd=.false.
|
|
endif
|
|
if(ndepth.eq.1) then
|
|
nsp=1
|
|
dosubtract=.false.
|
|
doosd=.false.
|
|
endif
|
|
|
|
do isp = 1,nsp
|
|
if(isp.eq.2) then
|
|
if(ndecodes.eq.0) exit
|
|
nd1=ndecodes
|
|
elseif(isp.eq.3) then
|
|
nd2=ndecodes-nd1
|
|
if(nd2.eq.0) exit
|
|
endif
|
|
|
|
candidate=0.0
|
|
ncand=0
|
|
call timer('getcand4',0)
|
|
call getcandidates4(dd,fa,fb,syncmin,nfqso,MAXCAND,savg,candidate, &
|
|
ncand,sbase)
|
|
call timer('getcand4',1)
|
|
dobigfft=.true.
|
|
do icand=1,ncand
|
|
f0=candidate(1,icand)
|
|
snr=candidate(2,icand)-1.0
|
|
call timer('ft4_down',0)
|
|
call ft4_downsample(dd,dobigfft,f0,cd2) !Downsample to 32 Sam/Sym
|
|
call timer('ft4_down',1)
|
|
if(dobigfft) dobigfft=.false.
|
|
sum2=sum(cd2*conjg(cd2))/(real(NMAX)/real(NDOWN))
|
|
if(sum2.gt.0.0) cd2=cd2/sqrt(sum2)
|
|
! Sample rate is now 12000/18 = 666.67 samples/second
|
|
do iseg=1,3 ! DT search is done over 3 segments
|
|
do isync=1,2
|
|
if(isync.eq.1) then
|
|
idfmin=-12
|
|
idfmax=12
|
|
idfstp=3
|
|
ibmin=-344
|
|
ibmax=1012
|
|
if(iseg.eq.1) then
|
|
ibmin=108
|
|
ibmax=560
|
|
elseif(iseg.eq.2) then
|
|
smax1=smax
|
|
ibmin=560
|
|
ibmax=1012
|
|
elseif(iseg.eq.3) then
|
|
ibmin=-344
|
|
ibmax=108
|
|
endif
|
|
ibstp=4
|
|
else
|
|
idfmin=idfbest-4
|
|
idfmax=idfbest+4
|
|
idfstp=1
|
|
ibmin=ibest-5
|
|
ibmax=ibest+5
|
|
ibstp=1
|
|
endif
|
|
ibest=-1
|
|
idfbest=0
|
|
smax=-99.
|
|
call timer('sync4d ',0)
|
|
do idf=idfmin,idfmax,idfstp
|
|
do istart=ibmin,ibmax,ibstp
|
|
call sync4d(cd2,istart,ctwk2(:,idf),1,sync) !Find sync power
|
|
if(sync.gt.smax) then
|
|
smax=sync
|
|
ibest=istart
|
|
idfbest=idf
|
|
endif
|
|
enddo
|
|
enddo
|
|
call timer('sync4d ',1)
|
|
enddo
|
|
if(iseg.eq.1) smax1=smax
|
|
if(smax.lt.1.2) cycle
|
|
if(iseg.gt.1 .and. smax.lt.smax1) cycle
|
|
f1=f0+real(idfbest)
|
|
if( f1.le.10.0 .or. f1.ge.4990.0 ) cycle
|
|
call timer('ft4down ',0)
|
|
call ft4_downsample(dd,dobigfft,f1,cb) !Final downsample, corrected f0
|
|
call timer('ft4down ',1)
|
|
sum2=sum(abs(cb)**2)/(real(NSS)*NN)
|
|
if(sum2.gt.0.0) cb=cb/sqrt(sum2)
|
|
cd=0.
|
|
if(ibest.ge.0) then
|
|
it=min(NDMAX-1,ibest+NN*NSS-1)
|
|
np=it-ibest+1
|
|
cd(0:np-1)=cb(ibest:it)
|
|
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/))
|
|
ns2=count(hbits( 67: 74).eq.(/0,1,0,0,1,1,1,0/))
|
|
ns3=count(hbits(133:140).eq.(/1,1,1,0,0,1,0,0/))
|
|
ns4=count(hbits(199:206).eq.(/1,0,1,1,0,0,0,1/))
|
|
nsync_qual=ns1+ns2+ns3+ns4
|
|
if(nsync_qual.lt. 20) cycle
|
|
|
|
scalefac=2.83
|
|
llra( 1: 58)=bitmetrics( 9: 66, 1)
|
|
llra( 59:116)=bitmetrics( 75:132, 1)
|
|
llra(117:174)=bitmetrics(141:198, 1)
|
|
llra=scalefac*llra
|
|
llrb( 1: 58)=bitmetrics( 9: 66, 2)
|
|
llrb( 59:116)=bitmetrics( 75:132, 2)
|
|
llrb(117:174)=bitmetrics(141:198, 2)
|
|
llrb=scalefac*llrb
|
|
llrc( 1: 58)=bitmetrics( 9: 66, 3)
|
|
llrc( 59:116)=bitmetrics( 75:132, 3)
|
|
llrc(117:174)=bitmetrics(141:198, 3)
|
|
llrc=scalefac*llrc
|
|
|
|
apmag=maxval(abs(llra))*1.1
|
|
npasses=3+nappasses(nQSOProgress)
|
|
if(lapcqonly) npasses=4
|
|
if(ndepth.eq.1) npasses=3
|
|
if(ncontest.ge.6) npasses=3 ! Don't support Fox and Hound
|
|
do ipass=1,npasses
|
|
if(ipass.eq.1) llr=llra
|
|
if(ipass.eq.2) llr=llrb
|
|
if(ipass.eq.3) llr=llrc
|
|
if(ipass.le.3) then
|
|
apmask=0
|
|
iaptype=0
|
|
endif
|
|
|
|
if(ipass .gt. 3) then
|
|
llrd=llrc
|
|
iaptype=naptypes(nQSOProgress,ipass-3)
|
|
if(lapcqonly) iaptype=1
|
|
|
|
! ncontest=0 : NONE
|
|
! 1 : NA_VHF
|
|
! 2 : EU_VHF
|
|
! 3 : FIELD DAY
|
|
! 4 : RTTY
|
|
! 5 : WW_DIGI
|
|
! 6 : FOX
|
|
! 7 : HOUND
|
|
!
|
|
! Conditions that cause us to bail out of AP decoding
|
|
napwid=80
|
|
if(ncontest.le.5 .and. iaptype.ge.3 .and. (abs(f1-nfqso).gt.napwid) ) cycle
|
|
if(iaptype.ge.2 .and. apbits(1).gt.1) cycle ! No, or nonstandard, mycall
|
|
if(iaptype.ge.3 .and. apbits(30).gt.1) cycle ! No, or nonstandard, dxcall
|
|
|
|
if(iaptype.eq.1) then ! CQ or CQ TEST or CQ FD or CQ RU or CQ WW
|
|
apmask=0
|
|
apmask(1:29)=1
|
|
if( ncontest.eq.0 ) llrd(1:29)=apmag*mcq(1:29)
|
|
if( ncontest.eq.1 ) llrd(1:29)=apmag*mcqtest(1:29)
|
|
if( ncontest.eq.2 ) llrd(1:29)=apmag*mcqtest(1:29)
|
|
if( ncontest.eq.3 ) llrd(1:29)=apmag*mcqfd(1:29)
|
|
if( ncontest.eq.4 ) llrd(1:29)=apmag*mcqru(1:29)
|
|
if( ncontest.eq.5 ) llrd(1:29)=apmag*mcqww(1:29)
|
|
endif
|
|
|
|
if(iaptype.eq.2) then ! MyCall,???,???
|
|
apmask=0
|
|
if(ncontest.eq.0.or.ncontest.eq.1.or.ncontest.eq.5) then
|
|
apmask(1:29)=1
|
|
llrd(1:29)=apmag*apbits(1:29)
|
|
else if(ncontest.eq.2) then
|
|
apmask(1:28)=1
|
|
llrd(1:28)=apmag*apbits(1:28)
|
|
else if(ncontest.eq.3) then
|
|
apmask(1:28)=1
|
|
llrd(1:28)=apmag*apbits(1:28)
|
|
else if(ncontest.eq.4) then
|
|
apmask(2:29)=1
|
|
llrd(2:29)=apmag*apmy_ru(1:28)
|
|
endif
|
|
endif
|
|
|
|
if(iaptype.eq.3) then ! MyCall,DxCall,???
|
|
apmask=0
|
|
if(ncontest.eq.0.or.ncontest.eq.1.or.ncontest.eq.2.or.ncontest.eq.5) then
|
|
apmask(1:58)=1
|
|
llrd(1:58)=apmag*apbits(1:58)
|
|
else if(ncontest.eq.3) then ! Field Day
|
|
apmask(1:56)=1
|
|
llrd(1:28)=apmag*apbits(1:28)
|
|
llrd(29:56)=apmag*aphis_fd(1:28)
|
|
else if(ncontest.eq.4) then
|
|
apmask(2:57)=1
|
|
llrd(2:29)=apmag*apmy_ru(1:28)
|
|
llrd(30:57)=apmag*apbits(30:57)
|
|
endif
|
|
endif
|
|
|
|
if(iaptype.eq.4 .or. iaptype.eq.5 .or. iaptype.eq.6) then
|
|
apmask=0
|
|
if(ncontest.le.5) then
|
|
apmask(1:77)=1 ! mycall, hiscall, RRR|73|RR73
|
|
if(iaptype.eq.6) llrd(1:77)=apmag*apbits(1:77)
|
|
endif
|
|
endif
|
|
|
|
llr=llrd
|
|
endif
|
|
message77=0
|
|
dmin=0.0
|
|
|
|
ndeep=2
|
|
maxosd=2
|
|
if(abs(nfqso-f1).le.napwid) then
|
|
ndeep=2
|
|
maxosd=3
|
|
endif
|
|
if(.not.doosd) maxosd = -1
|
|
call timer('dec174_91 ',0)
|
|
Keff=91
|
|
call decode174_91(llr,Keff,maxosd,ndeep,apmask,message91,cw, &
|
|
ntype,nharderror,dmin)
|
|
message77=message91(1:77)
|
|
call timer('dec174_91 ',1)
|
|
|
|
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(.not.unpk77_success) exit
|
|
if(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
|
|
qual=1.0-(nharderror+dmin)/60.0
|
|
call this%callback(smax,nsnr,xdt,f1,message,iaptype,qual)
|
|
exit
|
|
endif
|
|
enddo !Sequence estimation
|
|
if(nharderror.ge.0) exit
|
|
enddo !3 DT segments
|
|
enddo !Candidate list
|
|
enddo !Subtraction loop
|
|
return
|
|
end subroutine decode
|
|
|
|
end module ft4_decode
|