mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-23 20:58:55 -05:00
c1e779f966
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2646 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
160 lines
4.8 KiB
Fortran
160 lines
4.8 KiB
Fortran
program jt9sim
|
|
|
|
! Generate simulated data for testing of WSJT-X
|
|
|
|
parameter (NMAX=1800*12000)
|
|
integer ihdr(11)
|
|
integer*2 iwave !Generated waveform (no noise)
|
|
real*8 f0,f,dt,twopi,phi,dphi,baud,fspan
|
|
character msg*22,msg0*22,message*22,msgsent*22,arg*8,fname*11
|
|
|
|
integer*4 itone(85) !Channel symbols (values 0-8)
|
|
integer*4 i4DataSymNoGray(69) !Data Symbols, values 0-7
|
|
integer*1 i1ScrambledBits(207) !Hard-decision demodulated bits, interleaved
|
|
integer*1 i1Bits(207) !Encoded information-carrying bits
|
|
integer*1 i1SoftSymbols(207)
|
|
integer*1 i1
|
|
equivalence (i1,i4)
|
|
|
|
integer isync(85) !Sync vector
|
|
data isync/ &
|
|
1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1,0,0,0,0, &
|
|
1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,1,0, &
|
|
0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0, &
|
|
0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0, &
|
|
1,0,0,0,1/
|
|
common/acom/dat(NMAX),iwave(NMAX)
|
|
|
|
nargs=iargc()
|
|
if(nargs.ne.6) then
|
|
print*,'Usage: jt9sim "message" fspan nsigs minutes SNR nfiles'
|
|
print*,'Example: "CQ K1ABC FN42" 200 20 2 -28 1'
|
|
print*,' '
|
|
print*,'Enter message = "" to use entries in msgs.txt.'
|
|
print*,'Enter SNR = 0 to generate a range of SNRs.'
|
|
go to 999
|
|
endif
|
|
|
|
call getarg(1,msg0)
|
|
message=msg0 !Transmitted message
|
|
call getarg(2,arg)
|
|
read(arg,*) fspan !Total freq range (Hz)
|
|
call getarg(3,arg)
|
|
read(arg,*) nsigs !Number of signals in each file
|
|
call getarg(4,arg)
|
|
read(arg,*) minutes !Length of file (1 2 5 10 30 minutes)
|
|
call getarg(5,arg)
|
|
read(arg,*) snrdb !S/N in dB (2500 hz reference BW)
|
|
call getarg(6,arg)
|
|
read(arg,*) nfiles !Number of files
|
|
|
|
rmsdb=25.
|
|
rms=10.0**(0.05*rmsdb)
|
|
f0=1500.d0 !Center frequency (MHz)
|
|
fsample=12000.d0 !Sample rate (Hz)
|
|
dt=1.d0/fsample !Sample interval (s)
|
|
twopi=8.d0*atan(1.d0)
|
|
npts=12000*(60*minutes-6)
|
|
nsps=0
|
|
if(minutes.eq.1) nsps=6912
|
|
if(minutes.eq.2) nsps=15360
|
|
if(minutes.eq.5) nsps=40960
|
|
if(minutes.eq.10) nsps=82944
|
|
if(minutes.eq.30) nsps=252000
|
|
if(nsps.eq.0) stop 'Bad value for minutes.'
|
|
ihdr=0 !Temporary ###
|
|
|
|
if(msg0(1:3).eq.'sin') read(msg0(4:),*) sinfreq
|
|
|
|
open(12,file='msgs.txt',status='old')
|
|
|
|
write(*,1000)
|
|
1000 format('File N freq S/N Message'/ &
|
|
'---------------------------------------------------')
|
|
|
|
do ifile=1,nfiles
|
|
nmin=(ifile-1)*2*minutes
|
|
ihr=nmin/60
|
|
imin=mod(nmin,60)
|
|
write(fname,1002) ihr,imin !Create the output filenames
|
|
1002 format('000000_',2i2.2)
|
|
open(10,file=fname//'.wav',access='stream',status='unknown')
|
|
|
|
if(snrdb.lt.90) then
|
|
do i=1,npts
|
|
dat(i)=gran()
|
|
enddo
|
|
else
|
|
dat(1:npts)=0.
|
|
endif
|
|
|
|
if(msg0.ne.' ') then
|
|
call genjt9(message,minutes,msgsent,itone)
|
|
endif
|
|
|
|
rewind 12
|
|
do isig=1,nsigs
|
|
|
|
if(msg0.eq.' ') then
|
|
read(12,1004) message
|
|
1004 format(a22)
|
|
call genjt9(message,minutes,msgsent,itone)
|
|
endif
|
|
|
|
f=f0
|
|
if(nsigs.gt.1) f=f0 - 0.5d0*fspan + fspan*(isig-1.d0)/(nsigs-1.d0)
|
|
snrdbx=snrdb
|
|
sig=sqrt(2500.0/6000.0) * 10.0**(0.05*snrdbx)
|
|
write(*,1020) ifile,isig,f,snrdbx,msgsent
|
|
1020 format(i3,i4,f10.3,f7.1,2x,a22)
|
|
|
|
phi=0.
|
|
baud=12000.0/nsps
|
|
k=12000 !Start at t = 1 s
|
|
do isym=1,85
|
|
freq=f + itone(isym)*baud
|
|
if(msg0(1:3).eq.'sin') freq=sinfreq
|
|
dphi=twopi*freq*dt
|
|
do i=1,nsps
|
|
phi=phi + dphi
|
|
if(phi.lt.-twopi) phi=phi+twopi
|
|
if(phi.gt.twopi) phi=phi-twopi
|
|
xphi=phi
|
|
k=k+1
|
|
dat(k)=dat(k) + sig*sin(xphi) !Use lookup table for i*2 sin(x) ?
|
|
enddo
|
|
enddo
|
|
enddo
|
|
|
|
do i=1,npts
|
|
iwave(i)=nint(rms*dat(i))
|
|
enddo
|
|
|
|
write(10) ihdr,iwave(1:npts)
|
|
close(10)
|
|
|
|
! We're done! Now decode the data symbols from itone, as a test.
|
|
j=0
|
|
do i=1,85
|
|
if(isync(i).eq.1) cycle
|
|
j=j+1
|
|
i4DataSymNoGray(j)=igray(itone(i)-1,-1)
|
|
enddo
|
|
call unpackbits(i4DataSymNoGray,69,3,i1ScrambledBits)
|
|
call interleave9(i1ScrambledBits,-1,i1Bits)
|
|
|
|
do i=1,206
|
|
i4=-10
|
|
if(i1Bits(i).eq.1) i4=10
|
|
i4=i4+128
|
|
i1SoftSymbols(i)=i1
|
|
enddo
|
|
|
|
call decode9(i1SoftSymbols,msg)
|
|
|
|
if(msg.ne.msg0) print*,'Decode error: ',msg0,' ',msg
|
|
|
|
enddo
|
|
|
|
999 end program jt9sim
|