program ft8sim ! Generate simulated data for a 15-second HF/6m mode using 8-FSK. ! Output is saved to a *.wav file. use wavhdr include 'ft8_params.f90' !Set various constants parameter (NWAVE=NN*NSPS) type(hdr) h !Header for .wav file character arg*12,fname*17 character msg40*40,msg*22,msgsent*22,msg0*22 complex c0(0:NMAX-1) complex c(0:NMAX-1) real wave(NMAX) integer itone(NN) integer*1 msgbits(91) integer*2 iwave(NMAX) !Generated full-length waveform ! Get command-line argument(s) nargs=iargc() if(nargs.ne.9) then print*,'Usage: ft8sim "message" nsig|f0 DT fdop del width nfiles snr' print*,'Examples: ft8sim "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18' print*,' ft8sim "K1ABC W9XYZ EN37" 10 0.0 0.1 1.0 25 10 -18' print*,' ft8sim "K1ABC W9XYZ EN37" 25 0.0 0.1 1.0 25 10 -18' print*,' ft8sim "K1ABC RR73; W9XYZ -11" 300 0 0 0 25 1 -10' go to 999 endif call getarg(1,msg40) !Message to be transmitted call getarg(2,arg) read(arg,*) f0 !Frequency (only used for single-signal) call getarg(3,arg) read(arg,*) xdt !Time offset from nominal (s) call getarg(4,arg) read(arg,*) fspread !Watterson frequency spread (Hz) call getarg(5,arg) read(arg,*) delay !Watterson delay (ms) call getarg(6,arg) read(arg,*) width !Filter transition width (Hz) call getarg(7,arg) read(arg,*) nfiles !Number of files call getarg(8,arg) read(arg,*) snrdb !SNR_2500 call getarg(9,arg) read(arg,*) itype !itype=1 for (174,87), itype=2 for (174,91) nsig=1 if(f0.lt.100.0) then nsig=f0 f0=1500 endif nfiles=abs(nfiles) twopi=8.0*atan(1.0) fs=12000.0 !Sample rate (Hz) dt=1.0/fs !Sample interval (s) tt=NSPS*dt !Duration of symbols (s) baud=1.0/tt !Keying rate (baud) bw=8*baud !Occupied bandwidth (Hz) txt=NZ*dt !Transmission length (s) bandwidth_ratio=2500.0/(fs/2.0) sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb) if(snrdb.gt.90.0) sig=1.0 txt=NN*NSPS/12000.0 ! Source-encode, then get itone() if(index(msg40,';').le.0) then i3bit=0 msg=msg40(1:22) if(itype.eq.1) then call genft8(msg,i3bit,msgsent,msgbits,itone) elseif(itype.eq.2) then call genft8_174_91(msg,i3bit,msgsent,msgbits,itone) endif write(*,1000) f0,xdt,txt,snrdb,bw,msgsent 1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, & ' BW:',f4.1,2x,a22) else call foxgen_wrap(msg40,msgbits,itone) write(*,1001) f0,xdt,txt,snrdb,bw,msg40 1001 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, & ' BW:',f4.1,2x,a40) endif write(*,1030) msgbits(1:56) 1030 format(/'Call1: ',28i1,' Call2: ',28i1) if(itype.eq.1) then write(*,1032) msgbits(57:72),msgbits(73:75),msgbits(76:87) 1032 format('Grid: ',16i1,' 3Bit: ',3i1,' CRC12: ',12i1) elseif(itype.eq.2) then write(*,1033) msgbits(57:72),msgbits(73:77),msgbits(78:91) 1033 format('Grid: ',16i1,' 5Bit: ',5i1,' CRC14: ',14i1) endif write(*,1034) itone 1034 format(/'Channel symbols:'/79i1/) call sgran() msg0=msg do ifile=1,nfiles c=0. do isig=1,nsig c0=0. if(nsig.eq.2) then if(index(msg,'R-').gt.0) f0=500 i1=index(msg,' ') msg(i1+4:i1+4)=char(ichar('A')+isig-1) if(isig.eq.2) then f0=f0+100 endif if(itype.eq.1) then call genft8(msg,i3bit,msgsent,msgbits,itone) elseif(itype.eq.2) then call genft8_174_91(msg,i3bit,msgsent,msgbits,itone) endif endif if(nsig.eq.25) then f0=(isig+2)*100.0 else if(nsig.eq.50) then msg=msg0 f0=1000.0 + (isig-1)*60.0 i1=index(msg,' ') i2=index(msg(i1+1:),' ') + i1 msg(i1+2:i1+2)=char(ichar('0')+mod(isig-1,10)) msg(i1+3:i1+3)=char(ichar('A')+mod(isig-1,26)) msg(i1+4:i1+4)=char(ichar('A')+mod(isig-1,26)) msg(i1+5:i1+5)=char(ichar('A')+mod(isig-1,26)) write(msg(i2+3:i2+4),'(i2.2)') isig-1 if(ifile.ge.2 .and. isig.eq.ifile-1) then write(msg(i2+1:i2+4),1002) -isig 1002 format('R',i3.2) f0=600.0 + mod(isig-1,5)*60.0 endif if(itype.eq.1) then call genft8(msg,i3bit,msgsent,msgbits,itone) elseif(itype.eq.2) then call genft8_174_91(msg,i3bit,msgsent,msgbits,itone) endif endif ! k=nint((xdt+0.5+0.01*gran())/dt) k=nint((xdt+0.5)/dt) ia=k phi=0.0 do j=1,NN !Generate complex waveform dphi=twopi*(f0*dt+itone(j)/real(NSPS)) do i=1,NSPS if(k.ge.0 .and. k.lt.NMAX) c0(k)=cmplx(cos(phi),sin(phi)) k=k+1 phi=mod(phi+dphi,twopi) enddo enddo if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,fs,delay,fspread) c=c+sig*c0 enddo ib=k wave=real(c) peak=maxval(abs(wave(ia:ib))) rms=sqrt(dot_product(wave(ia:ib),wave(ia:ib))/NWAVE) nslots=1 if(width.gt.0.0) call filt8(f0,nslots,width,wave) if(snrdb.lt.90) then do i=1,NMAX !Add gaussian noise at specified SNR xnoise=gran() wave(i)=wave(i) + xnoise enddo endif fac=32767.0 rms=100.0 if(snrdb.ge.90.0) iwave(1:NMAX)=nint(fac*wave) if(snrdb.lt.90.0) iwave(1:NMAX)=nint(rms*wave) h=default_header(12000,NMAX) write(fname,1102) ifile 1102 format('000000_',i6.6,'.wav') open(10,file=fname,status='unknown',access='stream') write(10) h,iwave !Save to *.wav file close(10) write(*,1110) ifile,xdt,f0,snrdb,fname 1110 format(i4,f7.2,f8.2,f7.1,2x,a17) enddo 999 end program ft8sim