mirror of https://github.com/saitohirga/WSJT-X.git
193 lines
5.7 KiB
Fortran
193 lines
5.7 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 d6(85)
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integer*4 mettab(0:255,0:1)
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integer*4 t0(13) !72-bit message as 6-bit words
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integer*1 t1(13) !72 bits and zero tail as 8-bit bytes
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integer*1 t2(207) !Encoded information-carrying bits
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integer*1 t3(207) !Bits from t4, after interleaving
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integer*4 t4(69) !Symbols from t5, values 0-7
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integer*4 t5(69) !Gray-coded symbols, values 0-7
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integer*4 t6(85) !Channel symbols including sync, values 0-8
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integer*1 tmp(72)
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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=250880
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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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! Get the metric table
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bias=0.37
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scale=10 !Optimize?
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open(19,file='met8.21',status='old')
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do i=0,255
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read(19,*) x00,x0,x1
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mettab(i,0)=nint(scale*(x0-bias))
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mettab(i,1)=nint(scale*(x1-bias)) !### Check range, etc. ###
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enddo
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close(19)
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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)*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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call noisegen(dat,npts) !Generate Gaussian noise
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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,d6)
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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,d6)
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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(2500.0/12000.0) * 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 + d6(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)
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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 in d6, 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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t5(j)=d6(i)-1
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enddo
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call graycode(t5,69,-1,t4)
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call unpackbits(t4,69,3,t3)
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call interleave9(t3,-1,t2)
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nbits=72
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ndelta=17
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limit=1000
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do i=1,206
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i4=-10
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if(t2(i).eq.1) i4=10
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i4=i4+128
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t2(i)=i1
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enddo
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call fano232(t2,nbits+31,mettab,ndelta,limit,t1,ncycles,metric,ierr, &
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maxmetric,maxnp)
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nbytes=(nbits+7)/8
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do i=1,nbytes
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n=t1(i)
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t4(i)=iand(n,255)
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enddo
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call unpackbits(t4,nbytes,8,tmp)
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call packbits(tmp,12,6,t4)
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do i=1,12
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if(t4(i).lt.128) t1(i)=t4(i)
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if(t4(i).ge.128) t1(i)=t4(i)-256
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enddo
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do i=1,12
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t4(i)=t1(i)
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enddo
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call unpackmsg(t4,msg) !Unpack decoded 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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