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 i4tone(85) !Channel symbols (values 0-8) integer*4 i4DataSymNoGray(69) !Data Symbols, values 0-7 integer*1 i1ScrambledBits(207) !Unpacked bits, scrambled order integer*1 i1Bits(207) !Encoded information-carrying bits integer*1 i1SoftSymbols(207) integer*1 i1 equivalence (i1,i4) include 'jt9sync.f90' 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) 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.' f0=1500.d0 !Center frequency (MHz) if(minutes.eq.5) f0=1100. if(minutes.eq.10) f0=1050. if(minutes.eq.30) f0=1025. 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 !Loop over all files nmin=(ifile-1)*2*minutes ihr=nmin/60 imin=mod(nmin,60) write(fname,1002) ihr,imin !Create output filename 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,msgsent,i4tone) !Encode message into tone #s endif rewind 12 do isig=1,nsigs !Loop over multiple signals if(msg0.eq.' ') then read(12,1004) message !Use pre-generated message texts 1004 format(a22) call genjt9(message,msgsent,i4tone) endif f=f0 if(nsigs.gt.1) f=f0 - 0.5d0*fspan + fspan*(isig-1.d0)/(nsigs-1.d0) snrdbx=snrdb sig=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 audio at t = 1.0 s do isym=1,85 freq=f + i4tone(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 i4tone, as a test. if(msg0.ne.' ') then j=0 do i=1,85 if(isync(i).eq.1) cycle j=j+1 i4DataSymNoGray(j)=igray(i4tone(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 endif enddo 999 end program jt9sim