mirror of https://github.com/saitohirga/WSJT-X.git
158 lines
4.8 KiB
Fortran
158 lines
4.8 KiB
Fortran
program jt9sim
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! Generate simulated data for testing of WSJT-X
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parameter (NMAX=1800*12000)
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integer ihdr(11)
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integer*2 iwave !Generated waveform (no noise)
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real*8 f0,f,dt,twopi,phi,dphi,baud,fspan
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character msg*22,msg0*22,message*22,msgsent*22,arg*8,fname*11
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integer*4 itone(85) !Channel symbols (values 0-8)
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integer*4 i4DataSymNoGray(69) !Data Symbols, values 0-7
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integer*1 i1ScrambledBits(207) !Hard-decision demodulated bits, interleaved
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integer*1 i1Bits(207) !Encoded information-carrying bits
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integer*1 i1SoftSymbols(207)
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integer*1 i1
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equivalence (i1,i4)
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integer isync(85) !Sync vector
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data isync/ &
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1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1,0,0,0,0, &
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1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,1,0, &
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0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0, &
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0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0, &
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1,0,0,0,1/
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common/acom/dat(NMAX),iwave(NMAX)
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nargs=iargc()
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if(nargs.ne.6) then
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print*,'Usage: jt9sim "message" fspan nsigs minutes SNR nfiles'
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print*,'Example: "CQ K1ABC FN42" 200 20 2 -28 1'
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print*,' '
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print*,'Enter message = "" to use entries in msgs.txt.'
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print*,'Enter SNR = 0 to generate a range of SNRs.'
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go to 999
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endif
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call getarg(1,msg0)
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message=msg0 !Transmitted message
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call getarg(2,arg)
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read(arg,*) fspan !Total freq range (Hz)
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call getarg(3,arg)
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read(arg,*) nsigs !Number of signals in each file
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call getarg(4,arg)
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read(arg,*) minutes !Length of file (1 2 5 10 30 minutes)
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call getarg(5,arg)
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read(arg,*) snrdb !S/N in dB (2500 hz reference BW)
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call getarg(6,arg)
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read(arg,*) nfiles !Number of files
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rmsdb=25.
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rms=10.0**(0.05*rmsdb)
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f0=1500.d0 !Center frequency (MHz)
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fsample=12000.d0 !Sample rate (Hz)
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dt=1.d0/fsample !Sample interval (s)
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twopi=8.d0*atan(1.d0)
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npts=12000*(60*minutes-6)
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nsps=0
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if(minutes.eq.1) nsps=6912
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if(minutes.eq.2) nsps=15360
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if(minutes.eq.5) nsps=40960
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if(minutes.eq.10) nsps=82944
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if(minutes.eq.30) nsps=252000
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if(nsps.eq.0) stop 'Bad value for minutes.'
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ihdr=0 !Temporary ###
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open(12,file='msgs.txt',status='old')
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write(*,1000)
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1000 format('File N freq S/N Message'/ &
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'---------------------------------------------------')
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do ifile=1,nfiles
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nmin=(ifile-1)*2*minutes
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ihr=nmin/60
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imin=mod(nmin,60)
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write(fname,1002) ihr,imin !Create the output filenames
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1002 format('000000_',2i2.2)
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open(10,file=fname//'.wav',access='stream',status='unknown')
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if(snrdb.lt.90) then
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do i=1,npts
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dat(i)=gran()
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enddo
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else
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dat(1:npts)=0.
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endif
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if(msg0.ne.' ') then
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call genjt9(message,minutes,msgsent,itone)
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endif
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rewind 12
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do isig=1,nsigs
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if(msg0.eq.' ') then
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read(12,1004) message
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1004 format(a22)
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call genjt9(message,minutes,msgsent,itone)
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endif
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f=f0
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if(nsigs.gt.1) f=f0 - 0.5d0*fspan + fspan*(isig-1.d0)/(nsigs-1.d0)
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snrdbx=snrdb
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! if(snrdb.ge.-1.0) snrdbx=-15.0 - 15.0*(isig-1.0)/nsigs
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sig=sqrt(2500.0/6000.0) * 10.0**(0.05*snrdbx)
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write(*,1020) ifile,isig,f,snrdbx,msgsent
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1020 format(i3,i4,f10.3,f7.1,2x,a22)
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phi=0.
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baud=12000.0/nsps
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k=12000 !Start at t = 1 s
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do isym=1,85
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freq=f + itone(isym)*baud
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dphi=twopi*freq*dt
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do i=1,nsps
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phi=phi + dphi
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if(phi.lt.-twopi) phi=phi+twopi
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if(phi.gt.twopi) phi=phi-twopi
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xphi=phi
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k=k+1
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dat(k)=dat(k) + sig*sin(xphi) !Use lookup table for i*2 sin(x) ?
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enddo
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enddo
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enddo
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do i=1,npts
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iwave(i)=nint(rms*dat(i))
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enddo
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write(10) ihdr,iwave(1:npts)
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close(10)
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! We're done! Now decode the data symbols from itone, as a test.
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j=0
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do i=1,85
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if(isync(i).eq.1) cycle
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j=j+1
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i4DataSymNoGray(j)=igray(itone(i)-1,-1)
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enddo
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call unpackbits(i4DataSymNoGray,69,3,i1ScrambledBits)
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call interleave9(i1ScrambledBits,-1,i1Bits)
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do i=1,206
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i4=-10
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if(i1Bits(i).eq.1) i4=10
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i4=i4+128
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i1SoftSymbols(i)=i1
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enddo
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call decode9(i1SoftSymbols,msg)
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if(msg.ne.msg0) print*,'Decode error: ',msg0,' ',msg
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enddo
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999 end program jt9sim
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