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https://github.com/saitohirga/WSJT-X.git
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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)
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add_executable (qra64sim lib/qra/qra64/qra64sim.f90 wsjtx.rc)
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target_link_libraries (qra64sim wsjt_fort wsjt_cxx)
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add_executable (jt9sim lib/jt9sim.f90 wsjtx.rc)
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target_link_libraries (jt9sim wsjt_fort wsjt_cxx)
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add_executable (jt49sim lib/jt49sim.f90 wsjtx.rc)
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target_link_libraries (jt49sim wsjt_fort wsjt_cxx)
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add_executable (allsim lib/allsim.f90 wsjtx.rc)
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target_link_libraries (allsim wsjt_fort wsjt_cxx)
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@ -29,21 +29,39 @@ subroutine decode9w(nfqso,ntol,nsubmode,ss,id2,sync,nsnr,xdt1,f0,decoded)
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nadd=3
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if(iter.eq.2) nadd=2*nint(0.375*a(4)) + 1
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call sync9w(ss,nhsym,lag1,lag2,ia,ib,ccfred,ccfblue,ipk,lagpk,nadd)
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sum1=sum(ccfblue) - ccfblue(lagpk-1)-ccfblue(lagpk) -ccfblue(lagpk+1)
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sq=dot_product(ccfblue,ccfblue) - ccfblue(lagpk-1)**2 - &
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ccfblue(lagpk)**2 - ccfblue(lagpk+1)**2
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base=sum1/25.0
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rms=sqrt(sq/24.0)
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s=0.
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sq=0.
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ns=0
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do i=-9,18
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if(abs(i-lagpk).gt.3) then
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s=s+ccfblue(i)
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sq=sq+ccfblue(i)**2
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ns=ns+1
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endif
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enddo
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base=s/ns
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rms=sqrt(sq/ns - base**2)
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sync=(ccfblue(lagpk)-base)/rms
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nsnr=nint(db(sync)-29.7)
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xdt0=lagpk*tstep
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call lorentzian(ccfred(ia),ib-ia+1,a)
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f0=(ia+a(3))*df
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ccfblue=(ccfblue-base)/rms
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enddo
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ccfblue=(ccfblue-base)/rms
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call softsym9w(id2,npts,xdt0,f0,a(4)*df,nsubmode,xdt1-1.05,i1softsymbols)
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call softsym9w(id2,npts,xdt0,f0,a(4)*df,nsubmode,xdt1-1.05,snrdb,i1softsymbols)
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nsnr=nint(snrdb)
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call jt9fano(i1softsymbols,limit,nlim,decoded)
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!###
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! do i=-9,18
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! write(81,3081) i,ccfblue(i)
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!3081 format(i3,f10.3)
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! enddo
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! do i=1,NSMAX
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! write(82,3082) i*df,ccfred(i)
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!3082 format(f10.1,e12.3)
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! enddo
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!###
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return
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end subroutine decode9w
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190
lib/jt49sim.f90
Normal file
190
lib/jt49sim.f90
Normal file
@ -0,0 +1,190 @@
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program jt49sim
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! Generate simulated data for testing JT4 and JT9
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use wavhdr
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use packjt
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use jt4
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parameter (NMAX=60*12000) ! = 648,000
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parameter (NFFT=10*65536,NH=NFFT/2)
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type(hdr) h !Header for .wav file
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integer*2 iwave(NMAX) !Generated waveform
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integer*4 itone(206) !Channel symbols (values 0-8)
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real*4 xnoise(NMAX) !Generated random noise
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real*4 dat(NMAX) !Generated real data
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complex cdat(NMAX) !Generated complex waveform
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complex cspread(0:NFFT-1) !Complex amplitude for Rayleigh fading
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complex z
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real*8 f0,dt,twopi,phi,dphi,baud,fsample,freq,dnsps
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character message*22,fname*11,csubmode*2,arg*12
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character msgsent*22
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nargs=iargc()
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if(nargs.ne. 7) then
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print *, 'Usage: jt49sim "msg" nA-nE Nsigs fDop DT Nfiles SNR'
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print *, 'Example jt49sim "K1ABC W9XYZ EN37" 4G 10 0.2 0.0 1 0'
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print *, 'Example jt49sim "K1ABC W9XYZ EN37" 9A 1 0.0 0.0 1 -20'
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go to 999
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endif
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call getarg(1,message)
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call fmtmsg(message, iz)
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call getarg(2,csubmode)
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imode=ichar(csubmode(1:1)) - ichar('0')
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nsubmode=ichar(csubmode(2:2)) - ichar('A')
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if(imode.ne.4 .and. imode.ne.9) go to 999
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if(nsubmode.lt.0 .or. nsubmode.gt.7) go to 999
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call getarg(3,arg)
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read(arg,*) nsigs
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call getarg(4,arg)
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read(arg,*) fspread
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call getarg(5,arg)
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read(arg,*) xdt
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call getarg(6,arg)
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read(arg,*) nfiles
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call getarg(7,arg)
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read(arg,*) snrdb
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rms=100.
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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=60*12000 !Total samples in .wav file
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h=default_header(12000,npts)
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dfsig=2000.0/nsigs !Freq spacing between sigs in file (Hz)
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ichk=0
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imode=9
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if(imode.eq.4) then
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nsym=206 !Number of channel symbols (JT4)
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dnsps=12000.d0/4.375d0
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baud=12000.d0/dnsps !Keying rate = 1.7361111111
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else if(imode.eq.9) then
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nsym=85 !Number of channel symbols (JT9)
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dnsps=6912.d0 !Samples per symbol
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baud=12000.d0/dnsps !Keying rate = 1.736...
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endif
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write(*,1000)
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1000 format('File Sig Freq Mode S/N DT Dop Message'/60('-'))
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do ifile=1,nfiles !Loop over requested number of files
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write(fname,1002) ifile !Output filename
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1002 format('000000_',i4.4)
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open(10,file=fname//'.wav',access='stream',status='unknown')
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xnoise=0.
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cdat=0.
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if(snrdb.lt.90) then
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do i=1,npts
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xnoise(i)=gran() !Generate gaussian noise
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enddo
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endif
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do isig=1,nsigs !Generate requested number of sigs
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if(mod(nsigs,2).eq.0) f0=1500.0 + dfsig*(isig-0.5-nsigs/2)
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if(mod(nsigs,2).eq.1) f0=1500.0 + dfsig*(isig-(nsigs+1)/2)
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if(nsigs.eq.1) f0=1000.0
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xsnr=snrdb
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if(snrdb.eq.0.0) xsnr=-20 - isig
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if(imode.eq.4) call gen4(message,ichk,msgsent,itone,itype)
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if(imode.eq.9) call gen9(message,ichk,msgsent,itone,itype)
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bandwidth_ratio=2500.0/6000.0
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sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*xsnr)
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if(xsnr.gt.90.0) sig=1.0
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write(*,1020) ifile,isig,f0,csubmode,xsnr,xdt,fspread,message
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1020 format(i4,i4,f10.3,2x,a2,2x,f5.1,f6.2,f6.1,1x,a22)
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phi=0.d0
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dphi=0.d0
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k=(xdt+1.0)*12000 !Start audio at t = xdt + 1.0 s
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isym0=-99
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do i=1,npts !Add this signal into cdat()
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isym=i/dnsps + 1
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if(isym.gt.nsym) exit
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if(isym.ne.isym0) then
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if(message(1:1).eq.'@') then
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read(message(2:),*) freq
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else
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if(imode.eq.4) freq=f0 + itone(isym)*baud*nch(1+nsubmode) !JT4
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if(imode.eq.9) freq=f0 + itone(isym)*baud*(2**nsubmode) !JT9
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endif
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dphi=twopi*freq*dt
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isym0=isym
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endif
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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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z=cmplx(cos(xphi),sin(xphi))
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k=k+1
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if(k.ge.1) cdat(k)=cdat(k) + sig*z
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enddo
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enddo
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if(fspread.ne.0) then !Apply specified Doppler spread
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df=12000.0/nfft
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twopi=8*atan(1.0)
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cspread(0)=1.0
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cspread(NH)=0.
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b=6.0 !Lorenzian 3/28 onward
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do i=1,NH
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f=i*df
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x=b*f/fspread
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z=0.
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a=0.
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if(x.lt.3.0) then !Cutoff beyond x=3
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a=sqrt(1.111/(1.0+x*x)-0.1) !Lorentzian
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call random_number(r1)
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phi1=twopi*r1
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z=a*cmplx(cos(phi1),sin(phi1))
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endif
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cspread(i)=z
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z=0.
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if(x.lt.50.0) then
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call random_number(r2)
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phi2=twopi*r2
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z=a*cmplx(cos(phi2),sin(phi2))
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endif
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cspread(NFFT-i)=z
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enddo
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do i=0,NFFT-1
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f=i*df
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if(i.gt.NH) f=(i-nfft)*df
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s=real(cspread(i))**2 + aimag(cspread(i))**2
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! write(13,3000) i,f,s,cspread(i)
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!3000 format(i5,f10.3,3f12.6)
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enddo
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! s=real(cspread(0))**2 + aimag(cspread(0))**2
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! write(13,3000) 1024,0.0,s,cspread(0)
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call four2a(cspread,NFFT,1,1,1) !Transform to time domain
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sum=0.
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do i=0,NFFT-1
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p=real(cspread(i))**2 + aimag(cspread(i))**2
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sum=sum+p
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enddo
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avep=sum/NFFT
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fac=sqrt(1.0/avep)
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cspread=fac*cspread !Normalize to constant avg power
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cdat(1:NFFT)=cspread*cdat(1:NFFT) !Apply Rayleigh fading
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! do i=0,NFFT-1
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! p=real(cspread(i))**2 + aimag(cspread(i))**2
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! write(14,3010) i,p,cspread(i)
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!3010 format(i8,3f12.6)
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! enddo
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endif
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dat=aimag(cdat) + xnoise !Add the generated noise
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fac=32767.0/nsigs
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if(snrdb.ge.90.0) iwave(1:npts)=nint(fac*dat(1:npts))
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if(snrdb.lt.90.0) iwave(1:npts)=nint(rms*dat(1:npts))
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write(10) h,iwave(1:npts) !Save the .wav file
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close(10)
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enddo
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999 end program jt49sim
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@ -1,4 +1,4 @@
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subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,i1softsymbols)
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subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,snrdb,i1softsymbols)
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parameter (NFFT=6912,NH=NFFT/2,NQ=NH/2)
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real s(NQ)
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@ -88,8 +88,7 @@ subroutine softsym9w(id2,npts,xdt0,f0,width,nsubmode,xdt1,i1softsymbols)
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call pctile(s2,9*85,35,xmed)
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s3=s3/ave
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sig=sig/69. !Signal
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t=max(1.0,sig - 1.0)
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snrdb=db(t)
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snrdb=db(sig/xmed) - 28.0
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m0=3
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k=0
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