mirror of
https://github.com/saitohirga/WSJT-X.git
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75 lines
2.1 KiB
Fortran
75 lines
2.1 KiB
Fortran
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program wspr5sim
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include 'wsprlf_params.f90'
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character*12 arg
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character*22 msg,msgsent
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complex c0(0:NZ-1)
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complex c(0:NZ-1)
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integer itone(NN)
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.5) then
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print*,'Usage: wspr5sim "message" f0 DT nfiles snr'
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print*,'Example: wspr5sim "K1ABC FN42 30" 1500 0.0 10 -33'
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go to 999
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endif
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call getarg(1,msg) !Get message from command line
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call getarg(2,arg)
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read(arg,*) f0
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call getarg(3,arg)
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read(arg,*) xdt
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call getarg(4,arg)
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read(arg,*) nfiles
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call getarg(5,arg)
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read(arg,*) snrdb
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call genwspr5(msg,ichk,msgsent,itone,itype)
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write(*,1000) f0,xdt,snr,nfiles,msgsent
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1000 format('f0:',f9.3,' DT:',f6.2,' SNR:',f6.1,' nfiles:',i3,2x,a22)
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twopi=8.0*atan(1.0)
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fs=NSPS*12000.0/NSPS0 !Sample rate
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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ts=2*NSPS*dt !Duration of OQPSK symbols (s)
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baud=1.0/tt !Keying rate for "itone" symbols (baud)
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txt=NZ*dt !Transmission length (s)
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bandwidth_ratio=2500.0/(fs/2.0)
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sig=sqrt(bandwidth_ratio) * 10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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dphi0=twopi*(f0-0.25d0*baud)*dt
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dphi1=twopi*(f0+0.25d0*baud)*dt
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phi=0.d0
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c0=0.
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k=-1
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k=k+N2
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do j=1,NN
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dphi=dphi0
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if(itone(j).eq.1) dphi=dphi1
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if(k.eq.0) phi=-dphi
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do i=1,NSPS
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k=k+1
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phi=phi+dphi
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if(phi.gt.twopi) phi=phi-twopi
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xphi=phi
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if(k.ge.NZ) exit !### FIX THIS ###
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c0(k)=cmplx(cos(xphi),sin(xphi))
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enddo
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enddo
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c0=sig*c0 !Scale to requested sig level
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do ifile=1,nfiles
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if(snrdb.lt.90) then
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do i=0,NZ-1 !Add gaussian noise at specified SNR
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xnoise=gran()
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ynoise=gran()
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c(i)=c0(i) + cmplx(xnoise,ynoise)
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enddo
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endif
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write(10) c
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enddo
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999 end program wspr5sim
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