mirror of https://github.com/saitohirga/WSJT-X.git
132 lines
4.0 KiB
Fortran
132 lines
4.0 KiB
Fortran
program jt65sim
|
|
|
|
! Generate simulated data for testing of WSJT-X
|
|
|
|
use wavhdr
|
|
use packjt
|
|
parameter (NTMAX=54)
|
|
parameter (NMAX=NTMAX*12000)
|
|
type(hdr) h
|
|
integer*2 iwave(NMAX) !Generated waveform (no noise)
|
|
integer*4 itone(126) !Channel symbols (values 0-65)
|
|
integer dgen(12),sent(63)
|
|
real*4 dat(NMAX)
|
|
real*8 f0,dt,twopi,phi,dphi,baud,fsample,freq,sps
|
|
character msg*22,arg*8,fname*11,csubmode*1
|
|
integer nprc(126)
|
|
data nprc/1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0, &
|
|
0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1, &
|
|
0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1, &
|
|
0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1, &
|
|
1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1, &
|
|
0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1, &
|
|
1,1,1,1,1,1/
|
|
|
|
nargs=iargc()
|
|
if(nargs.ne.5) then
|
|
print*,'Usage: jt65sim mode nRay nsigs SNR nfiles'
|
|
print*,'Example: jt65sim B 0 10 -24 1'
|
|
print*,'Enter SNR = 0 to generate a range of SNRs.'
|
|
go to 999
|
|
endif
|
|
|
|
csubmode='A'
|
|
call getarg(1,csubmode)
|
|
mode65=1
|
|
if(csubmode.eq.'B') mode65=2
|
|
if(csubmode.eq.'C') mode65=4
|
|
call getarg(2,arg)
|
|
read(arg,*) nRay !1 ==> Rayleigh fading
|
|
call getarg(3,arg)
|
|
read(arg,*) nsigs !Number of signals in each file
|
|
call getarg(4,arg)
|
|
read(arg,*) snrdb !S/N in dB (2500 hz reference BW)
|
|
call getarg(5,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=54*12000
|
|
baud=11025.d0/4096.d0
|
|
sps=12000.d0/baud !Samples per symbol, at fsample=12000 Hz
|
|
nsym=126
|
|
h=default_header(12000,npts)
|
|
|
|
do ifile=1,nfiles !Loop over all files
|
|
nmin=ifile
|
|
ihr=nmin/60
|
|
imin=mod(nmin,60)
|
|
write(fname,1002) ihr,imin !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() !Generate AWGN
|
|
enddo
|
|
else
|
|
dat(1:npts)=0.
|
|
endif
|
|
|
|
dfsig=2000.0/nsigs
|
|
do isig=1,nsigs
|
|
if(mod(nsigs,2).eq.0) f0=1500.0 + dfsig*(isig-0.5-nsigs/2)
|
|
if(mod(nsigs,2).eq.1) f0=1500.0 + dfsig*(isig-(nsigs+1)/2)
|
|
nsnr=nint(snrdb)
|
|
if(snrdb.eq.0.0) nsnr=-19 - isig
|
|
write(msg,1010) nsnr
|
|
1010 format('K1ABC W9XYZ ',i3.2)
|
|
|
|
call packmsg(msg,dgen,itype) !Pack message into 12 six-bit bytes
|
|
call rs_encode(dgen,sent) !RS encode
|
|
call interleave63(sent,1) !Interleave channel symbols
|
|
call graycode65(sent,63,1) !Apply Gray code
|
|
|
|
k=0
|
|
do j=1,nsym
|
|
if(nprc(j).eq.0) then
|
|
k=k+1
|
|
itone(j)=sent(k)+2
|
|
else
|
|
itone(j)=0
|
|
endif
|
|
enddo
|
|
|
|
sig=10.0**(0.05*nsnr)
|
|
if(nsnr.gt.90.0) sig=1.0
|
|
write(*,1020) ifile,isig,f0,csubmode,nsnr,sig,msg
|
|
1020 format(i3,i4,f10.3,1x,a1,i5,f8.4,2x,a22)
|
|
|
|
phi=0.d0
|
|
dphi=0.d0
|
|
k=12000 !Start audio at t = 1.0 s
|
|
isym0=-99
|
|
do i=1,npts
|
|
isym=nint(i/sps)+1
|
|
if(isym.gt.nsym) exit
|
|
if(isym.ne.isym0) then
|
|
freq=f0 + itone(isym)*baud*mode65
|
|
dphi=twopi*freq*dt
|
|
isym0=isym
|
|
endif
|
|
phi=phi + dphi
|
|
if(phi.gt.twopi) phi=phi-twopi
|
|
xphi=phi
|
|
k=k+1
|
|
dat(k)=dat(k) + sig*sin(xphi)
|
|
enddo
|
|
enddo
|
|
|
|
fac=32767.0/nsigs !### ??? ###
|
|
if(snrdb.ge.90.0) iwave(1:npts)=nint(fac*dat(1:npts))
|
|
if(snrdb.lt.90.0) iwave(1:npts)=nint(rms*dat(1:npts))
|
|
write(10) h,iwave(1:npts)
|
|
close(10)
|
|
|
|
enddo
|
|
|
|
999 end program jt65sim
|