mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-14 08:01:49 -05:00
d9df62b9e9
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2608 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
193 lines
5.7 KiB
Fortran
193 lines
5.7 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 d6(85)
|
|
|
|
integer*4 mettab(0:255,0:1)
|
|
integer*4 t0(13) !72-bit message as 6-bit words
|
|
integer*1 t1(13) !72 bits and zero tail as 8-bit bytes
|
|
integer*1 t2(207) !Encoded information-carrying bits
|
|
integer*1 t3(207) !Bits from t4, after interleaving
|
|
integer*4 t4(69) !Symbols from t5, values 0-7
|
|
integer*4 t5(69) !Gray-coded symbols, values 0-7
|
|
integer*4 t6(85) !Channel symbols including sync, values 0-8
|
|
integer*1 tmp(72)
|
|
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=250880
|
|
if(nsps.eq.0) stop 'Bad value for minutes.'
|
|
ihdr=0 !Temporary ###
|
|
|
|
open(12,file='msgs.txt',status='old')
|
|
|
|
! Get the metric table
|
|
bias=0.37
|
|
scale=10 !Optimize?
|
|
open(19,file='met8.21',status='old')
|
|
|
|
do i=0,255
|
|
read(19,*) x00,x0,x1
|
|
mettab(i,0)=nint(scale*(x0-bias))
|
|
mettab(i,1)=nint(scale*(x1-bias)) !### Check range, etc. ###
|
|
enddo
|
|
close(19)
|
|
|
|
write(*,1000)
|
|
1000 format('File N freq S/N Message'/ &
|
|
'---------------------------------------------------')
|
|
|
|
do ifile=1,nfiles
|
|
nmin=(ifile-1)*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
|
|
call noisegen(dat,npts) !Generate Gaussian noise
|
|
else
|
|
dat(1:npts)=0.
|
|
endif
|
|
|
|
if(msg0.ne.' ') then
|
|
call genjt9(message,minutes,msgsent,d6)
|
|
endif
|
|
|
|
rewind 12
|
|
do isig=1,nsigs
|
|
|
|
if(msg0.eq.' ') then
|
|
read(12,1004) message
|
|
1004 format(a22)
|
|
call genjt9(message,minutes,msgsent,d6)
|
|
endif
|
|
|
|
f=f0
|
|
if(nsigs.gt.1) f=f0 - 0.5d0*fspan + fspan*(isig-1.d0)/(nsigs-1.d0)
|
|
snrdbx=snrdb
|
|
! if(snrdb.ge.-1.0) snrdbx=-15.0 - 15.0*(isig-1.0)/nsigs
|
|
sig=sqrt(2500.0/12000.0) * 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 + d6(isym)*baud
|
|
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)
|
|
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 in d6, as a test.
|
|
j=0
|
|
do i=1,85
|
|
if(isync(i).eq.1) cycle
|
|
j=j+1
|
|
t5(j)=d6(i)-1
|
|
enddo
|
|
|
|
call graycode(t5,69,-1,t4)
|
|
call unpackbits(t4,69,3,t3)
|
|
call interleave9(t3,-1,t2)
|
|
|
|
nbits=72
|
|
ndelta=17
|
|
limit=1000
|
|
do i=1,206
|
|
i4=-10
|
|
if(t2(i).eq.1) i4=10
|
|
i4=i4+128
|
|
t2(i)=i1
|
|
enddo
|
|
|
|
call fano232(t2,nbits+31,mettab,ndelta,limit,t1,ncycles,metric,ierr, &
|
|
maxmetric,maxnp)
|
|
|
|
nbytes=(nbits+7)/8
|
|
do i=1,nbytes
|
|
n=t1(i)
|
|
t4(i)=iand(n,255)
|
|
enddo
|
|
call unpackbits(t4,nbytes,8,tmp)
|
|
call packbits(tmp,12,6,t4)
|
|
do i=1,12
|
|
if(t4(i).lt.128) t1(i)=t4(i)
|
|
if(t4(i).ge.128) t1(i)=t4(i)-256
|
|
enddo
|
|
do i=1,12
|
|
t4(i)=t1(i)
|
|
enddo
|
|
call unpackmsg(t4,msg) !Unpack decoded msg
|
|
if(msg.ne.msg0) print*,'Decode error: ',msg0,' ',msg
|
|
|
|
enddo
|
|
|
|
999 end program jt9sim
|