mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-12-23 19:25:37 -05:00
New simulator jt49sim, replaces both jt4sim and jt9sim. Fix the S/N estimates made for slow/wide JT9 submodes.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8639 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor
parent
648b77072a
commit
be8c837d85
@ -1174,8 +1174,8 @@ target_link_libraries (jt65sim wsjt_fort wsjt_cxx)
|
||||
add_executable (qra64sim lib/qra/qra64/qra64sim.f90 wsjtx.rc)
|
||||
target_link_libraries (qra64sim wsjt_fort wsjt_cxx)
|
||||
|
||||
add_executable (jt9sim lib/jt9sim.f90 wsjtx.rc)
|
||||
target_link_libraries (jt9sim wsjt_fort wsjt_cxx)
|
||||
add_executable (jt49sim lib/jt49sim.f90 wsjtx.rc)
|
||||
target_link_libraries (jt49sim wsjt_fort wsjt_cxx)
|
||||
|
||||
add_executable (allsim lib/allsim.f90 wsjtx.rc)
|
||||
target_link_libraries (allsim wsjt_fort wsjt_cxx)
|
||||
|
||||
@ -29,21 +29,39 @@ subroutine decode9w(nfqso,ntol,nsubmode,ss,id2,sync,nsnr,xdt1,f0,decoded)
|
||||
nadd=3
|
||||
if(iter.eq.2) nadd=2*nint(0.375*a(4)) + 1
|
||||
call sync9w(ss,nhsym,lag1,lag2,ia,ib,ccfred,ccfblue,ipk,lagpk,nadd)
|
||||
sum1=sum(ccfblue) - ccfblue(lagpk-1)-ccfblue(lagpk) -ccfblue(lagpk+1)
|
||||
sq=dot_product(ccfblue,ccfblue) - ccfblue(lagpk-1)**2 - &
|
||||
ccfblue(lagpk)**2 - ccfblue(lagpk+1)**2
|
||||
base=sum1/25.0
|
||||
rms=sqrt(sq/24.0)
|
||||
s=0.
|
||||
sq=0.
|
||||
ns=0
|
||||
do i=-9,18
|
||||
if(abs(i-lagpk).gt.3) then
|
||||
s=s+ccfblue(i)
|
||||
sq=sq+ccfblue(i)**2
|
||||
ns=ns+1
|
||||
endif
|
||||
enddo
|
||||
base=s/ns
|
||||
rms=sqrt(sq/ns - base**2)
|
||||
sync=(ccfblue(lagpk)-base)/rms
|
||||
nsnr=nint(db(sync)-29.7)
|
||||
xdt0=lagpk*tstep
|
||||
call lorentzian(ccfred(ia),ib-ia+1,a)
|
||||
f0=(ia+a(3))*df
|
||||
ccfblue=(ccfblue-base)/rms
|
||||
enddo
|
||||
ccfblue=(ccfblue-base)/rms
|
||||
|
||||
call softsym9w(id2,npts,xdt0,f0,a(4)*df,nsubmode,xdt1-1.05,i1softsymbols)
|
||||
call softsym9w(id2,npts,xdt0,f0,a(4)*df,nsubmode,xdt1-1.05,snrdb,i1softsymbols)
|
||||
nsnr=nint(snrdb)
|
||||
call jt9fano(i1softsymbols,limit,nlim,decoded)
|
||||
|
||||
!###
|
||||
! do i=-9,18
|
||||
! write(81,3081) i,ccfblue(i)
|
||||
!3081 format(i3,f10.3)
|
||||
! enddo
|
||||
! do i=1,NSMAX
|
||||
! write(82,3082) i*df,ccfred(i)
|
||||
!3082 format(f10.1,e12.3)
|
||||
! enddo
|
||||
!###
|
||||
|
||||
return
|
||||
end subroutine decode9w
|
||||
|
||||
190
lib/jt49sim.f90
Normal file
190
lib/jt49sim.f90
Normal file
@ -0,0 +1,190 @@
|
||||
program jt49sim
|
||||
|
||||
! Generate simulated data for testing JT4 and JT9
|
||||
|
||||
use wavhdr
|
||||
use packjt
|
||||
use jt4
|
||||
parameter (NMAX=60*12000) ! = 648,000
|
||||
parameter (NFFT=10*65536,NH=NFFT/2)
|
||||
type(hdr) h !Header for .wav file
|
||||
integer*2 iwave(NMAX) !Generated waveform
|
||||
integer*4 itone(206) !Channel symbols (values 0-8)
|
||||
real*4 xnoise(NMAX) !Generated random noise
|
||||
real*4 dat(NMAX) !Generated real data
|
||||
complex cdat(NMAX) !Generated complex waveform
|
||||
complex cspread(0:NFFT-1) !Complex amplitude for Rayleigh fading
|
||||
complex z
|
||||
real*8 f0,dt,twopi,phi,dphi,baud,fsample,freq,dnsps
|
||||
character message*22,fname*11,csubmode*2,arg*12
|
||||
character msgsent*22
|
||||
|
||||
nargs=iargc()
|
||||
if(nargs.ne. 7) then
|
||||
print *, 'Usage: jt49sim "msg" nA-nE Nsigs fDop DT Nfiles SNR'
|
||||
print *, 'Example jt49sim "K1ABC W9XYZ EN37" 4G 10 0.2 0.0 1 0'
|
||||
print *, 'Example jt49sim "K1ABC W9XYZ EN37" 9A 1 0.0 0.0 1 -20'
|
||||
go to 999
|
||||
endif
|
||||
call getarg(1,message)
|
||||
call fmtmsg(message, iz)
|
||||
call getarg(2,csubmode)
|
||||
imode=ichar(csubmode(1:1)) - ichar('0')
|
||||
nsubmode=ichar(csubmode(2:2)) - ichar('A')
|
||||
if(imode.ne.4 .and. imode.ne.9) go to 999
|
||||
if(nsubmode.lt.0 .or. nsubmode.gt.7) go to 999
|
||||
call getarg(3,arg)
|
||||
read(arg,*) nsigs
|
||||
call getarg(4,arg)
|
||||
read(arg,*) fspread
|
||||
call getarg(5,arg)
|
||||
read(arg,*) xdt
|
||||
call getarg(6,arg)
|
||||
read(arg,*) nfiles
|
||||
call getarg(7,arg)
|
||||
read(arg,*) snrdb
|
||||
|
||||
rms=100.
|
||||
fsample=12000.d0 !Sample rate (Hz)
|
||||
dt=1.d0/fsample !Sample interval (s)
|
||||
twopi=8.d0*atan(1.d0)
|
||||
npts=60*12000 !Total samples in .wav file
|
||||
h=default_header(12000,npts)
|
||||
dfsig=2000.0/nsigs !Freq spacing between sigs in file (Hz)
|
||||
ichk=0
|
||||
|
||||
imode=9
|
||||
if(imode.eq.4) then
|
||||
nsym=206 !Number of channel symbols (JT4)
|
||||
dnsps=12000.d0/4.375d0
|
||||
baud=12000.d0/dnsps !Keying rate = 1.7361111111
|
||||
else if(imode.eq.9) then
|
||||
nsym=85 !Number of channel symbols (JT9)
|
||||
dnsps=6912.d0 !Samples per symbol
|
||||
baud=12000.d0/dnsps !Keying rate = 1.736...
|
||||
endif
|
||||
|
||||
write(*,1000)
|
||||
1000 format('File Sig Freq Mode S/N DT Dop Message'/60('-'))
|
||||
|
||||
do ifile=1,nfiles !Loop over requested number of files
|
||||
write(fname,1002) ifile !Output filename
|
||||
1002 format('000000_',i4.4)
|
||||
open(10,file=fname//'.wav',access='stream',status='unknown')
|
||||
xnoise=0.
|
||||
cdat=0.
|
||||
if(snrdb.lt.90) then
|
||||
do i=1,npts
|
||||
xnoise(i)=gran() !Generate gaussian noise
|
||||
enddo
|
||||
endif
|
||||
|
||||
do isig=1,nsigs !Generate requested number of sigs
|
||||
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)
|
||||
if(nsigs.eq.1) f0=1000.0
|
||||
xsnr=snrdb
|
||||
if(snrdb.eq.0.0) xsnr=-20 - isig
|
||||
|
||||
if(imode.eq.4) call gen4(message,ichk,msgsent,itone,itype)
|
||||
if(imode.eq.9) call gen9(message,ichk,msgsent,itone,itype)
|
||||
|
||||
bandwidth_ratio=2500.0/6000.0
|
||||
sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*xsnr)
|
||||
if(xsnr.gt.90.0) sig=1.0
|
||||
write(*,1020) ifile,isig,f0,csubmode,xsnr,xdt,fspread,message
|
||||
1020 format(i4,i4,f10.3,2x,a2,2x,f5.1,f6.2,f6.1,1x,a22)
|
||||
|
||||
phi=0.d0
|
||||
dphi=0.d0
|
||||
k=(xdt+1.0)*12000 !Start audio at t = xdt + 1.0 s
|
||||
isym0=-99
|
||||
|
||||
do i=1,npts !Add this signal into cdat()
|
||||
isym=i/dnsps + 1
|
||||
if(isym.gt.nsym) exit
|
||||
if(isym.ne.isym0) then
|
||||
if(message(1:1).eq.'@') then
|
||||
read(message(2:),*) freq
|
||||
else
|
||||
if(imode.eq.4) freq=f0 + itone(isym)*baud*nch(1+nsubmode) !JT4
|
||||
if(imode.eq.9) freq=f0 + itone(isym)*baud*(2**nsubmode) !JT9
|
||||
endif
|
||||
dphi=twopi*freq*dt
|
||||
isym0=isym
|
||||
endif
|
||||
phi=phi + dphi
|
||||
if(phi.gt.twopi) phi=phi-twopi
|
||||
xphi=phi
|
||||
z=cmplx(cos(xphi),sin(xphi))
|
||||
k=k+1
|
||||
if(k.ge.1) cdat(k)=cdat(k) + sig*z
|
||||
enddo
|
||||
enddo
|
||||
|
||||
if(fspread.ne.0) then !Apply specified Doppler spread
|
||||
df=12000.0/nfft
|
||||
twopi=8*atan(1.0)
|
||||
cspread(0)=1.0
|
||||
cspread(NH)=0.
|
||||
b=6.0 !Lorenzian 3/28 onward
|
||||
do i=1,NH
|
||||
f=i*df
|
||||
x=b*f/fspread
|
||||
z=0.
|
||||
a=0.
|
||||
if(x.lt.3.0) then !Cutoff beyond x=3
|
||||
a=sqrt(1.111/(1.0+x*x)-0.1) !Lorentzian
|
||||
call random_number(r1)
|
||||
phi1=twopi*r1
|
||||
z=a*cmplx(cos(phi1),sin(phi1))
|
||||
endif
|
||||
cspread(i)=z
|
||||
z=0.
|
||||
if(x.lt.50.0) then
|
||||
call random_number(r2)
|
||||
phi2=twopi*r2
|
||||
z=a*cmplx(cos(phi2),sin(phi2))
|
||||
endif
|
||||
cspread(NFFT-i)=z
|
||||
enddo
|
||||
|
||||
do i=0,NFFT-1
|
||||
f=i*df
|
||||
if(i.gt.NH) f=(i-nfft)*df
|
||||
s=real(cspread(i))**2 + aimag(cspread(i))**2
|
||||
! write(13,3000) i,f,s,cspread(i)
|
||||
!3000 format(i5,f10.3,3f12.6)
|
||||
enddo
|
||||
! s=real(cspread(0))**2 + aimag(cspread(0))**2
|
||||
! write(13,3000) 1024,0.0,s,cspread(0)
|
||||
|
||||
call four2a(cspread,NFFT,1,1,1) !Transform to time domain
|
||||
|
||||
sum=0.
|
||||
do i=0,NFFT-1
|
||||
p=real(cspread(i))**2 + aimag(cspread(i))**2
|
||||
sum=sum+p
|
||||
enddo
|
||||
avep=sum/NFFT
|
||||
fac=sqrt(1.0/avep)
|
||||
cspread=fac*cspread !Normalize to constant avg power
|
||||
cdat(1:NFFT)=cspread*cdat(1:NFFT) !Apply Rayleigh fading
|
||||
|
||||
! do i=0,NFFT-1
|
||||
! p=real(cspread(i))**2 + aimag(cspread(i))**2
|
||||
! write(14,3010) i,p,cspread(i)
|
||||
!3010 format(i8,3f12.6)
|
||||
! enddo
|
||||
|
||||
endif
|
||||
|
||||
dat=aimag(cdat) + xnoise !Add the generated noise
|
||||
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) !Save the .wav file
|
||||
close(10)
|
||||
enddo
|
||||
|
||||
999 end program jt49sim
|
||||
@ -1,4 +1,4 @@
|
||||
subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,i1softsymbols)
|
||||
subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,snrdb,i1softsymbols)
|
||||
|
||||
parameter (NFFT=6912,NH=NFFT/2,NQ=NH/2)
|
||||
real s(NQ)
|
||||
@ -88,17 +88,16 @@ subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,i1softsymbols)
|
||||
call pctile(s2,9*85,35,xmed)
|
||||
s3=s3/ave
|
||||
sig=sig/69. !Signal
|
||||
t=max(1.0,sig - 1.0)
|
||||
snrdb=db(t)
|
||||
snrdb=db(sig/xmed) - 28.0
|
||||
|
||||
m0=3
|
||||
k=0
|
||||
do j=1,69
|
||||
smax=0.
|
||||
do i=0,7
|
||||
if(s3(i,j).gt.smax) smax=s3(i,j)
|
||||
enddo
|
||||
|
||||
smax=0.
|
||||
do i=0,7
|
||||
if(s3(i,j).gt.smax) smax=s3(i,j)
|
||||
enddo
|
||||
|
||||
do m=m0-1,0,-1 !Get bit-wise soft symbols
|
||||
if(m.eq.2) then
|
||||
r1=max(s3(4,j),s3(5,j),s3(6,j),s3(7,j))
|
||||
|
||||
Loading…
Reference in New Issue
Block a user