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https://github.com/saitohirga/WSJT-X.git
synced 2025-03-22 12:08:43 -04:00
First commits in the superfox branch: synctest, sfocsim, and rstest.
This commit is contained in:
Joe Taylor
parent
d67a406bf0
commit
27824dc45d
@ -1154,6 +1154,12 @@ target_link_libraries (test_snr wsjt_fort)
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add_executable (q65sim lib/qra/q65/q65sim.f90)
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target_link_libraries (q65sim wsjt_fort wsjt_cxx)
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#add_executable (rstest lib/superfox/rstest.f90)
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#target_link_libraries (rstest wsjt_fort wsjt_cxx)
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add_executable (synctest lib/superfox/synctest.f90)
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target_link_libraries (synctest wsjt_fort wsjt_cxx)
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add_executable (q65code lib/qra/q65/q65code.f90)
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target_link_libraries (q65code wsjt_fort wsjt_cxx)
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65
lib/superfox/rstest.f90
Normal file
65
lib/superfox/rstest.f90
Normal file
@ -0,0 +1,65 @@
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program rstest
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character arg*8
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integer dgen(235) !Generated data, i*4
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integer gsym0(255) !Encoded data, Karn
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integer gsym(255) !Encoded data with errors
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integer dat(235) !Decoded data, i*4
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nargs=iargc()
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if(nargs.ne.4) then
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print*,'Usage: rstest M N K nerr'
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print*,'Example: rstest 7 127 51 38'
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go to 999
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endif
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nkv=0
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call getarg(1,arg)
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read(arg,*) mm
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call getarg(2,arg)
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read(arg,*) nn
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call getarg(3,arg)
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read(arg,*) kk
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call getarg(4,arg)
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read(arg,*) nerr
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! Initialize the Karn codec
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nq=2**mm
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nfz=3
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call rs_init(mm,nq,nn,kk,nfz) !Initialize the Karn RS codec
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! Generate and random symbols wuth values 0 to nq-1
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do i=1,kk
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dgen(i)=(nq-0.0001)*ran1(idum)
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enddo
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write(*,1000)
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1000 format('Generated data symbols, values 0-127:')
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write(*,1002) dgen(1:kk)
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1002 format(20i4)
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call rs_encode(dgen,gsym0) !Encode dgen into gsym0
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write(*,1004)
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1004 format(/'Encoded channel symbols')
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write(*,1002) gsym0(1:nn)
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gsym=gsym0
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do i=1,nerr !Introduce errors
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gsym(i)=mod(gsym(i)+1,nq)
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enddo
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write(*,1006)
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1006 format(/'Recovered channel symbols, with errors:')
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write(*,1002) gsym(1:nn)
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call rs_decode(gsym,era,0,dat,nfixed)
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ibad=0
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do i=1,kk
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if(dat(i).ne.dgen(i)) ibad=ibad+1
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enddo
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write(*,1008)
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1008 format(/'Decoded result:')
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write(*,1002) dat(1:kk)
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write(*,1100) nerr,nfixed,ibad
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1100 format(/'nerr:',i3,' nfixed:',i3,' ibad:',i3)
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999 end program rstest
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116
lib/superfox/sfoxsim.f90
Normal file
116
lib/superfox/sfoxsim.f90
Normal file
@ -0,0 +1,116 @@
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program sfoxsim
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! Generate a SuperFox waveform with specified SNR and channel parameters.
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! Output is saved to a *.wav file.
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! SuperFox uses a (127,51) code with 7-bit symbols, punctured to (125,49).
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! The puncured symbols contain a 14-bit CRC.
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! First tests use RS(127,51) code and Berlekamp-Massey decoder.
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use wavhdr
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! use packjt77
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parameter (NMAX=15*12000)
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parameter (NSPS=1024,NSYNC=2*12000)
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parameter (NWAVE=125*NSPS+NSYNC)
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type(hdr) h !Header for .wav file
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character arg*12,fname*17
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! character msg37*37,msgsent37*37
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complex c0(0:NMAX-1)
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complex c(0:NMAX-1)
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complex cwave(0:NWAVE-1)
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real wave(NMAX)
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real xjunk(NWAVE)
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real xdat(51)
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integer*1 idat(51)
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integer itone(125)
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integer*1 msgbits(77)
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integer*2 iwave(NMAX) !Generated full-length waveform
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! Get command-line argument(s)
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nargs=iargc()
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if(nargs.ne.6) then
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print*,'Usage: sfoxsim f0 DT fSpread del nfiles snr'
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print*,'Example: sfoxsim 1500.0 0.0 0.1 1.0 10 -15'
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go to 999
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endif
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call getarg(1,arg)
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read(arg,*) f0 !Frequency (only used for single-signal
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call getarg(2,arg)
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read(arg,*) xdt !Time offset from nominal (s)
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call getarg(3,arg)
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read(arg,*) fspread !Watterson frequency spread (Hz)
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call getarg(4,arg)
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read(arg,*) delay !Watterson delay (ms)
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call getarg(5,arg)
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read(arg,*) nfiles !Number of files
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call getarg(6,arg)
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read(arg,*) snrdb !SNR_2500
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twopi=8.0*atan(1.0)
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fs=12000.0 !Sample rate (Hz)
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of symbols (s)
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baud=1.0/tt !Keying rate (baud)
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bw=128*baud !Occupied bandwidth (Hz)
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tsync=NSYNC*dt !Duration of analog sync function
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txt=tsync + 125*NSPS*dt !Overall transmission length (s)
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bandwidth_ratio=2500.0/(fs/2.0)
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sig=sqrt(2*bandwidth_ratio) * 10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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write(*,1000) f0,xdt,fspread,delay,tsync,txt,bw,snrdb
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1000 format('f0:',f7.1,' DT:',f6.2,' fSpread:',f5.1,' delay:',f4.1/ &
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'Tsync:',f4.1,' TxT:',f6.1,' BW:',f7.1,' SNR:',f6.1)
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write(*,*)
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! Source-encode, then get itone()
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call random_number(xdat)
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idat=int(128*xdat)
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itone=0
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itone(1:49)=idat(1:49)
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write(*,'(20i4)') idat
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write(*,*)
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write(*,'(a17)') 'Channel symbols: '
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write(*,'(20i4)') itone
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write(*,*)
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if(nsps.ne.-99) go to 999
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do ifile=1,nfiles
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c0=0.
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c0(0:NWAVE-1)=cwave
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c0=cshift(c0,-nint((xdt+0.5)/dt))
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! if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,NWAVE,fs,delay,fspread)
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c=sig*c0
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wave=imag(c)
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peak=maxval(abs(wave))
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nslots=1
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if(snrdb.lt.90) then
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do i=1,NMAX !Add gaussian noise at specified SNR
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xnoise=gran()
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wave(i)=wave(i) + xnoise
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enddo
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endif
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gain=100.0
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if(snrdb.lt.90.0) then
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wave=gain*wave
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else
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datpk=maxval(abs(wave))
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fac=32766.9/datpk
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wave=fac*wave
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endif
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if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
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iwave=nint(wave)
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h=default_header(12000,NMAX)
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write(fname,1102) ifile
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1102 format('000000_',i6.6,'.wav')
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open(10,file=fname,status='unknown',access='stream')
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write(10) h,iwave !Save to *.wav file
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close(10)
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write(*,1110) ifile,xdt,f0,snrdb,fname
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1110 format(i4,f7.2,f8.2,f7.1,2x,a17)
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enddo
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999 end program sfoxsim
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147
lib/superfox/synctest.f90
Normal file
147
lib/superfox/synctest.f90
Normal file
@ -0,0 +1,147 @@
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program synctest
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! Generate and test sync waveforms for possible use in SuperFox signal.
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use wavhdr
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parameter (NMAX=15*12000) !Total samples in .wav file
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parameter (NFFT=32768)
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parameter (MMAX=150,JMAX=300)
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type(hdr) h !Header for .wav file
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integer*2 iwave(NMAX) !Generated i*2 waveform
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real*4 xnoise(NMAX) !Random noise
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real*4 dat(NMAX) !Generated real data
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real ccf(-MMAX:MMAX,-JMAX:JMAX) !2D CCF: DT, dFreq offsets
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complex cdat(-15000:NMAX) !Generated complex waveform
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complex clo(NMAX) !Complex Local Oscillator
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complex cnoise(NMAX) !Complex noise
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complex crcvd(-15000:NMAX) !Signal as received
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complex c(0:NFFT-1)
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complex w,wstep,w0,wstep0
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integer ipk(2)
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character fname*17,arg*12
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character*1 line(-30:30),mark(0:5)
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data mark/' ','.','-','+','X','$'/
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nargs=iargc()
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if(nargs.ne.4) then
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print*,'Usage: synctest f0 DT width snr'
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print*,'Example: synctest 1500.0 2.5 1500 -20'
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go to 999
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endif
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call getarg(1,arg)
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read(arg,*) f0
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call getarg(2,arg)
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read(arg,*) xdt
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call getarg(3,arg)
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read(arg,*) syncwidth
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call getarg(4,arg)
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read(arg,*) snrdb
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ntrperiod=15
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rms=100.
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fsample=12000.d0 !Sample rate (Hz)
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npts=fsample*ntrperiod !Total samples in .wav file
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twopi=8.d0*atan(1.d0)
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tsync=2.0
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nsync=fsample*tsync
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nsym=125 !Number of channel symbols
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nsps=1024
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nsync=tsync*fsample
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baud=12000.d0/nsps !Keying rate (6.67 baud fot 15-s sequences)
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h=default_header(12000,npts)
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fname='000000_000001.wav'
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open(10,file=trim(fname),access='stream',status='unknown')
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xnoise=0.
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cnoise=0.
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if(snrdb.lt.90) then
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do i=1,npts !Generate Gaussian noise
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x=gran()
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y=gran()
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xnoise(i)=x
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cnoise(i)=cmplx(x,y)
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enddo
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endif
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bandwidth_ratio=2500.0/6000.0
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sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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w0=1.0
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w=1.0
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a0=1500.0+ syncwidth/2.0 !Frequency at midpoint of LO waveform
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a1=f0 + syncwidth/2.0 !Frequency at midpoint of sync waveform
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a2=2.0*syncwidth/tsync !Frequency drift rate
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! Generate complex sync signal
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x0=0.5*(nsync+1)
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s=2.0/nsync
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cdat=0.
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i0=xdt*12000.0
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do i=1,nsync
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if(i.eq.nsync/2+1) a2=-a2 !Reverse sign of drift at midpoint
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x=s*(i-x0)
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dphi0=(a0 + x*a2) * (twopi/fsample)
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wstep0=cmplx(cos(dphi0),sin(dphi0))
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w0=w0*wstep0
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dphi=(a1 + x*a2) * (twopi/fsample)
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wstep=cmplx(cos(dphi),sin(dphi))
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w=w*wstep
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clo(i)=conjg(sig*w0)
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cdat(i+i0)=sig*w
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enddo
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dat=aimag(cdat(1:NMAX)) + xnoise !Add generated AWGN noise
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fac=32767.0
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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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crcvd(-1000:0)=0.
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crcvd(1:NMAX)=cdat(1:NMAX) + cnoise
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ccf=0.
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df=12000.0/NFFT !0.366211
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do m=-MMAX,MMAX
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lag=100*m
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! c(0:nsync-1)=crcvd(1+lag:nsync+lag)*conjg(cdat(1:nsync))
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c(0:nsync-1)=crcvd(1+lag:nsync+lag)*clo(1:nsync)
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c(nsync:)=0.
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fac=1.e-3
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c=fac*c
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call four2a(c,NFFT,1,-1,1)
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do j=-JMAX,JMAX
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k=j
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if(k.lt.0) k=k+NFFT
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ccf(m,j)=real(c(k))**2 + aimag(c(k))**2
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enddo
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enddo
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ccf=ccf/maxval(ccf)
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ipk=maxloc(ccf)
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ipk(1)=ipk(1)-MMAX-1
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ipk(2)=ipk(2)-JMAX-1
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ma=ipk(1)-10
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mb=ipk(1)+10
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ja=ipk(2)-30
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jb=ipk(2)+30
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do m=ma,mb
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do j=ja,jb
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k=5.999*ccf(m,j)
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line(j-ipk(2))=mark(k)
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enddo
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write(*,1300) m/120.0,line
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1300 format(f6.3,2x,61a1)
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enddo
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dt=ipk(1)/120.0
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dfreq=ipk(2)*df
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f=1500.0+dfreq
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t=dt
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write(*,1100) f0,xdt
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1100 format(/'f0:',f7.1,' xdt:',f6.2)
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write(*,1112) f,t
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1112 format('f: ',f7.1,' DT:',f6.2)
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write(*,1110) f-f0,t-xdt
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1110 format('err:',f6.1,f12.2)
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999 end program synctest
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