diff --git a/CMakeLists.txt b/CMakeLists.txt index 80866a67e..1c9cde401 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -1154,6 +1154,12 @@ target_link_libraries (test_snr wsjt_fort) add_executable (q65sim lib/qra/q65/q65sim.f90) target_link_libraries (q65sim wsjt_fort wsjt_cxx) +#add_executable (rstest lib/superfox/rstest.f90) +#target_link_libraries (rstest wsjt_fort wsjt_cxx) + +add_executable (synctest lib/superfox/synctest.f90) +target_link_libraries (synctest wsjt_fort wsjt_cxx) + add_executable (q65code lib/qra/q65/q65code.f90) target_link_libraries (q65code wsjt_fort wsjt_cxx) diff --git a/lib/superfox/rstest.f90 b/lib/superfox/rstest.f90 new file mode 100644 index 000000000..4ab9f9fc9 --- /dev/null +++ b/lib/superfox/rstest.f90 @@ -0,0 +1,65 @@ +program rstest + + character arg*8 + integer dgen(235) !Generated data, i*4 + integer gsym0(255) !Encoded data, Karn + integer gsym(255) !Encoded data with errors + integer dat(235) !Decoded data, i*4 + + nargs=iargc() + if(nargs.ne.4) then + print*,'Usage: rstest M N K nerr' + print*,'Example: rstest 7 127 51 38' + go to 999 + endif + nkv=0 + call getarg(1,arg) + read(arg,*) mm + call getarg(2,arg) + read(arg,*) nn + call getarg(3,arg) + read(arg,*) kk + call getarg(4,arg) + read(arg,*) nerr + +! Initialize the Karn codec + nq=2**mm + nfz=3 + call rs_init(mm,nq,nn,kk,nfz) !Initialize the Karn RS codec + +! Generate and random symbols wuth values 0 to nq-1 + do i=1,kk + dgen(i)=(nq-0.0001)*ran1(idum) + enddo + + write(*,1000) +1000 format('Generated data symbols, values 0-127:') + write(*,1002) dgen(1:kk) +1002 format(20i4) + + call rs_encode(dgen,gsym0) !Encode dgen into gsym0 + write(*,1004) +1004 format(/'Encoded channel symbols') + write(*,1002) gsym0(1:nn) + + gsym=gsym0 + do i=1,nerr !Introduce errors + gsym(i)=mod(gsym(i)+1,nq) + enddo + write(*,1006) +1006 format(/'Recovered channel symbols, with errors:') + write(*,1002) gsym(1:nn) + + call rs_decode(gsym,era,0,dat,nfixed) + ibad=0 + do i=1,kk + if(dat(i).ne.dgen(i)) ibad=ibad+1 + enddo + write(*,1008) +1008 format(/'Decoded result:') + write(*,1002) dat(1:kk) + write(*,1100) nerr,nfixed,ibad +1100 format(/'nerr:',i3,' nfixed:',i3,' ibad:',i3) + +999 end program rstest + diff --git a/lib/superfox/sfoxsim.f90 b/lib/superfox/sfoxsim.f90 new file mode 100644 index 000000000..3419c7eb6 --- /dev/null +++ b/lib/superfox/sfoxsim.f90 @@ -0,0 +1,116 @@ +program sfoxsim + +! Generate a SuperFox waveform with specified SNR and channel parameters. +! Output is saved to a *.wav file. +! SuperFox uses a (127,51) code with 7-bit symbols, punctured to (125,49). +! The puncured symbols contain a 14-bit CRC. +! First tests use RS(127,51) code and Berlekamp-Massey decoder. + + use wavhdr +! use packjt77 + parameter (NMAX=15*12000) + parameter (NSPS=1024,NSYNC=2*12000) + parameter (NWAVE=125*NSPS+NSYNC) + type(hdr) h !Header for .wav file + character arg*12,fname*17 +! character msg37*37,msgsent37*37 + complex c0(0:NMAX-1) + complex c(0:NMAX-1) + complex cwave(0:NWAVE-1) + real wave(NMAX) + real xjunk(NWAVE) + real xdat(51) + integer*1 idat(51) + integer itone(125) + integer*1 msgbits(77) + integer*2 iwave(NMAX) !Generated full-length waveform + +! Get command-line argument(s) + nargs=iargc() + if(nargs.ne.6) then + print*,'Usage: sfoxsim f0 DT fSpread del nfiles snr' + print*,'Example: sfoxsim 1500.0 0.0 0.1 1.0 10 -15' + go to 999 + endif + call getarg(1,arg) + read(arg,*) f0 !Frequency (only used for single-signal + call getarg(2,arg) + read(arg,*) xdt !Time offset from nominal (s) + call getarg(3,arg) + read(arg,*) fspread !Watterson frequency spread (Hz) + call getarg(4,arg) + read(arg,*) delay !Watterson delay (ms) + call getarg(5,arg) + read(arg,*) nfiles !Number of files + call getarg(6,arg) + read(arg,*) snrdb !SNR_2500 + + 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=128*baud !Occupied bandwidth (Hz) + tsync=NSYNC*dt !Duration of analog sync function + txt=tsync + 125*NSPS*dt !Overall 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 + + write(*,1000) f0,xdt,fspread,delay,tsync,txt,bw,snrdb +1000 format('f0:',f7.1,' DT:',f6.2,' fSpread:',f5.1,' delay:',f4.1/ & + 'Tsync:',f4.1,' TxT:',f6.1,' BW:',f7.1,' SNR:',f6.1) + write(*,*) + +! Source-encode, then get itone() + + call random_number(xdat) + idat=int(128*xdat) + itone=0 + itone(1:49)=idat(1:49) + + write(*,'(20i4)') idat + write(*,*) + write(*,'(a17)') 'Channel symbols: ' + write(*,'(20i4)') itone + write(*,*) + if(nsps.ne.-99) go to 999 + + do ifile=1,nfiles + c0=0. + c0(0:NWAVE-1)=cwave + c0=cshift(c0,-nint((xdt+0.5)/dt)) +! if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,NWAVE,fs,delay,fspread) + c=sig*c0 + + wave=imag(c) + peak=maxval(abs(wave)) + nslots=1 + + if(snrdb.lt.90) then + do i=1,NMAX !Add gaussian noise at specified SNR + xnoise=gran() + wave(i)=wave(i) + xnoise + enddo + endif + + gain=100.0 + if(snrdb.lt.90.0) then + wave=gain*wave + else + datpk=maxval(abs(wave)) + fac=32766.9/datpk + wave=fac*wave + endif + if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped." + iwave=nint(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 sfoxsim diff --git a/lib/superfox/synctest.f90 b/lib/superfox/synctest.f90 new file mode 100644 index 000000000..d5458228f --- /dev/null +++ b/lib/superfox/synctest.f90 @@ -0,0 +1,147 @@ +program synctest + +! Generate and test sync waveforms for possible use in SuperFox signal. + + use wavhdr + parameter (NMAX=15*12000) !Total samples in .wav file + parameter (NFFT=32768) + parameter (MMAX=150,JMAX=300) + type(hdr) h !Header for .wav file + integer*2 iwave(NMAX) !Generated i*2 waveform + real*4 xnoise(NMAX) !Random noise + real*4 dat(NMAX) !Generated real data + real ccf(-MMAX:MMAX,-JMAX:JMAX) !2D CCF: DT, dFreq offsets + complex cdat(-15000:NMAX) !Generated complex waveform + complex clo(NMAX) !Complex Local Oscillator + complex cnoise(NMAX) !Complex noise + complex crcvd(-15000:NMAX) !Signal as received + complex c(0:NFFT-1) + complex w,wstep,w0,wstep0 + integer ipk(2) + character fname*17,arg*12 + character*1 line(-30:30),mark(0:5) + data mark/' ','.','-','+','X','$'/ + + nargs=iargc() + if(nargs.ne.4) then + print*,'Usage: synctest f0 DT width snr' + print*,'Example: synctest 1500.0 2.5 1500 -20' + go to 999 + endif + call getarg(1,arg) + read(arg,*) f0 + call getarg(2,arg) + read(arg,*) xdt + call getarg(3,arg) + read(arg,*) syncwidth + call getarg(4,arg) + read(arg,*) snrdb + + ntrperiod=15 + rms=100. + fsample=12000.d0 !Sample rate (Hz) + npts=fsample*ntrperiod !Total samples in .wav file + twopi=8.d0*atan(1.d0) + tsync=2.0 + nsync=fsample*tsync + nsym=125 !Number of channel symbols + nsps=1024 + nsync=tsync*fsample + + baud=12000.d0/nsps !Keying rate (6.67 baud fot 15-s sequences) + h=default_header(12000,npts) + fname='000000_000001.wav' + open(10,file=trim(fname),access='stream',status='unknown') + xnoise=0. + cnoise=0. + if(snrdb.lt.90) then + do i=1,npts !Generate Gaussian noise + x=gran() + y=gran() + xnoise(i)=x + cnoise(i)=cmplx(x,y) + enddo + endif + + bandwidth_ratio=2500.0/6000.0 + sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*snrdb) + if(snrdb.gt.90.0) sig=1.0 + + w0=1.0 + w=1.0 + a0=1500.0+ syncwidth/2.0 !Frequency at midpoint of LO waveform + a1=f0 + syncwidth/2.0 !Frequency at midpoint of sync waveform + a2=2.0*syncwidth/tsync !Frequency drift rate + +! Generate complex sync signal + x0=0.5*(nsync+1) + s=2.0/nsync + cdat=0. + i0=xdt*12000.0 + do i=1,nsync + if(i.eq.nsync/2+1) a2=-a2 !Reverse sign of drift at midpoint + x=s*(i-x0) + dphi0=(a0 + x*a2) * (twopi/fsample) + wstep0=cmplx(cos(dphi0),sin(dphi0)) + w0=w0*wstep0 + dphi=(a1 + x*a2) * (twopi/fsample) + wstep=cmplx(cos(dphi),sin(dphi)) + w=w*wstep + clo(i)=conjg(sig*w0) + cdat(i+i0)=sig*w + enddo + + dat=aimag(cdat(1:NMAX)) + xnoise !Add generated AWGN noise + fac=32767.0 + 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) + + crcvd(-1000:0)=0. + crcvd(1:NMAX)=cdat(1:NMAX) + cnoise + ccf=0. + df=12000.0/NFFT !0.366211 + do m=-MMAX,MMAX + lag=100*m +! c(0:nsync-1)=crcvd(1+lag:nsync+lag)*conjg(cdat(1:nsync)) + c(0:nsync-1)=crcvd(1+lag:nsync+lag)*clo(1:nsync) + c(nsync:)=0. + fac=1.e-3 + c=fac*c + call four2a(c,NFFT,1,-1,1) + do j=-JMAX,JMAX + k=j + if(k.lt.0) k=k+NFFT + ccf(m,j)=real(c(k))**2 + aimag(c(k))**2 + enddo + enddo + + ccf=ccf/maxval(ccf) + ipk=maxloc(ccf) + ipk(1)=ipk(1)-MMAX-1 + ipk(2)=ipk(2)-JMAX-1 + ma=ipk(1)-10 + mb=ipk(1)+10 + ja=ipk(2)-30 + jb=ipk(2)+30 + do m=ma,mb + do j=ja,jb + k=5.999*ccf(m,j) + line(j-ipk(2))=mark(k) + enddo + write(*,1300) m/120.0,line +1300 format(f6.3,2x,61a1) + enddo + dt=ipk(1)/120.0 + dfreq=ipk(2)*df + f=1500.0+dfreq + t=dt + write(*,1100) f0,xdt +1100 format(/'f0:',f7.1,' xdt:',f6.2) + write(*,1112) f,t +1112 format('f: ',f7.1,' DT:',f6.2) + write(*,1110) f-f0,t-xdt +1110 format('err:',f6.1,f12.2) + +999 end program synctest