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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7717 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor 2017-06-15 11:48:09 +00:00
parent 906c2fbcb9
commit a867ea2422
2 changed files with 111 additions and 1 deletions
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2
CMakeLists.txt
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@ -890,7 +890,7 @@ if (Fortran_COMPILER_NAME MATCHES "gfortran.*")
set (CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -isysroot ${CMAKE_OSX_SYSROOT}")
endif (CMAKE_OSX_SYSROOT)
set (CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -funroll-all-loops -fno-f2c ${General_FFLAGS}")
set (CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -fbounds-check -funroll-all-loops -fno-f2c ${General_FFLAGS}")
set (CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -fbounds-check -fno-f2c ${General_FFLAGS}")
elseif (Fortran_COMPILER_NAME MATCHES "ifort.*")
# ifort (untested)

110
lib/fsk4hf/ft8d.f90 Normal file
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@ -0,0 +1,110 @@
program ft8d
! Decode FT8 data read from *.wav files.
! FT8 is a potential mode intended for use at 6m (and maybe HF). It uses an
! LDPC (174,87) code, 8-FSK modulation, and 15 second T/R sequences. Otherwise
! should behave like JT65 and JT9 as used on HF bands, except that QSOs are
! 4 x faster.
! Reception and Demodulation algorithm:
! ... tbd ...
include 'ft8_params.f90'
parameter(NRECENT=10)
character*12 recent_calls(NRECENT)
character message*22,cbits*75,infile*80,datetime*11
real s(NH1,NHSYM)
real s1(0:7,ND)
real ps(0:7)
real rxdata(3*ND),llr(3*ND) !Soft symbols
integer ihdr(11)
integer*2 iwave(NMAX) !Generated full-length waveform
! integer*1 idat(7)
integer*1 decoded(KK),apmask(ND),cw(ND)
nargs=iargc()
if(nargs.lt.1) then
print*,'Usage: ft8d file1 [file2 ...]'
go to 999
endif
twopi=8.0*atan(1.0)
fs=12000.0 !Sample rate
dt=1.0/fs !Sample interval (s)
tt=NSPS*dt !Duration of "itone" symbols (s)
ts=2*NSPS*dt !Duration of OQPSK symbols (s)
baud=1.0/tt !Keying rate (baud)
txt=NZ*dt !Transmission length (s)
do ifile=1,nargs
call getarg(ifile,infile)
open(10,file=infile,status='old',access='stream')
read(10,end=999) ihdr,iwave
close(10)
j2=index(infile,'.wav')
read(infile(j2-4:j2-1),*) nutc
datetime=infile(j2-11:j2-1)
call sync8(iwave,xdt,f1,s)
tstep=0.5*NSPS/12000.0
df=12000.0/NFFT1
i0=nint(f1/df)
j0=nint((xdt+0.5)/tstep)
fac=20.0/maxval(s)
s=fac*s
j=0
ia=i0
ib=i0+14
do k=1,NN
n=j0+2*(k-1)+1
if(k.le.7) cycle
if(k.ge.37 .and. k.le.43) cycle
if(k.gt.72) cycle
j=j+1
s1(0:7,j)=s(ia:ib:2,n)
enddo
do j=1,ND
ps=s1(0:7,j)
! ps=log(ps)
r1=max(ps(1),ps(3),ps(5),ps(7))-max(ps(0),ps(2),ps(4),ps(6))
r2=max(ps(2),ps(3),ps(6),ps(7))-max(ps(0),ps(1),ps(4),ps(5))
r4=max(ps(4),ps(5),ps(6),ps(7))-max(ps(0),ps(1),ps(2),ps(3))
rxdata(3*j-2)=r4
rxdata(3*j-1)=r2
rxdata(3*j)=r1
enddo
rxav=sum(rxdata)/ND
rx2av=sum(rxdata*rxdata)/ND
rxsig=sqrt(rx2av-rxav*rxav)
rxdata=rxdata/rxsig
ss=0.84
llr=2.0*rxdata/(ss*ss)
apmask=0
max_iterations=20
ifer=0
call bpdecode174(llr,apmask,max_iterations,decoded,niterations)
! if(niterations.lt.0) call osd174(llr,4,decoded,niterations,cw)
nbadcrc=0
if(niterations.ge.0) call chkcrc10(decoded,nbadcrc)
! if(niterations.lt.0 .or. nbadcrc.ne.0) ifer=1
if(niterations.lt.0) ifer=1
! if(ifer.eq.0) exit
message=' '
if(ifer.eq.0) then
call extractmessage174(decoded,message,ncrcflag,recent_calls,nrecent)
nsnr=nint(xsnr)
nfdot=0
write(13,1110) datetime,0,nsnr,xdt,freq,message,nfdot
1110 format(a11,2i4,f6.2,f12.7,2x,a22,i3)
write(*,1112) datetime(8:11),nsnr,xdt,nint(f1),message
1112 format(a4,i4,f5.1,i6,2x,a22)
endif
enddo ! ifile loop
! write(*,1120)
!1120 format("<DecodeFinished>")
999 end program ft8d