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Update wsprd README and delete an obsolete program.
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Steve Franke
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commit
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@ -1,136 +0,0 @@
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program ft8sim2
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! Generate simulated "type 2" ft8 files
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! Output is saved to a *.wav file.
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use wavhdr
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use packjt77
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include 'ft8_params.f90' !Set various constants
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parameter (NWAVE=NN*NSPS)
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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,msg40*40
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character c77*77
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complex c0(0:NMAX-1)
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complex c(0:NMAX-1)
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real wave(NMAX)
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integer itone(NN)
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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.8) then
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print*,'Usage: ft8sim2 "message" f0 DT fdop del width nfiles snr'
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print*,'Examples: ft8sim2 "K1ABC W9XYZ EN37" 1500.0 0.0 0.1 1.0 0 10 -18'
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print*,' ft8sim2 "WA9XYZ/R KA1ABC/R FN42" 1500.0 0.0 0.1 1.0 0 10 -18'
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print*,' ft8sim2 "K1ABC RR73; W9XYZ <KH1/KH7Z> -11" 300 0 0 0 25 1 -10'
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go to 999
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endif
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call getarg(1,msg37) !Message to be transmitted
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call getarg(2,arg)
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read(arg,*) f0 !Frequency (only used for single-signal)
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call getarg(3,arg)
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read(arg,*) xdt !Time offset from nominal (s)
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call getarg(4,arg)
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read(arg,*) fspread !Watterson frequency spread (Hz)
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call getarg(5,arg)
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read(arg,*) delay !Watterson delay (ms)
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call getarg(6,arg)
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read(arg,*) width !Filter transition width (Hz)
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call getarg(7,arg)
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read(arg,*) nfiles !Number of files
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call getarg(8,arg)
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read(arg,*) snrdb !SNR_2500
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nsig=1
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if(f0.lt.100.0) then
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nsig=f0
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f0=1500
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endif
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nfiles=abs(nfiles)
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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=8*baud !Occupied bandwidth (Hz)
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txt=NZ*dt !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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txt=NN*NSPS/12000.0
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! Source-encode, then get itone()
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i3=-1
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n3=-1
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call pack77(msg37,i3,n3,c77)
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call genft8_174_91(msg37,i3,n3,msgsent37,msgbits,itone)
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write(*,*)
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write(*,'(a23,a37,3x,a7,i1,a1,i1)') 'New Style FT8 Message: ',msgsent37,'i3.n3: ',i3,'.',n3
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write(*,1000) f0,xdt,txt,snrdb,bw
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1000 format('f0:',f9.3,' DT:',f6.2,' TxT:',f6.1,' SNR:',f6.1, &
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' BW:',f4.1)
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write(*,*)
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if(i3.eq.1) then
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write(*,*) ' mycall hiscall hisgrid'
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write(*,'(28i1,1x,i1,1x,28i1,1x,i1,1x,i1,1x,15i1,1x,3i1)') msgbits(1:77)
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else
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write(*,'(a14)') 'Message bits: '
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write(*,'(77i1)') msgbits
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endif
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write(*,*)
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write(*,'(a17)') 'Channel symbols: '
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write(*,'(79i1)') itone
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write(*,*)
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call sgran()
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msg0=msg
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do ifile=1,nfiles
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k=nint((xdt+0.5)/dt)
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ia=k
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phi=0.0
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c0=0.0
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do j=1,NN !Generate complex waveform
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dphi=twopi*(f0*dt+itone(j)/real(NSPS))
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do i=1,NSPS
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if(k.ge.0 .and. k.lt.NMAX) c0(k)=cmplx(cos(phi),sin(phi))
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k=k+1
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phi=mod(phi+dphi,twopi)
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enddo
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enddo
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if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c0,NMAX,fs,delay,fspread)
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c=sig*c0
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ib=k
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wave=real(c)
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peak=maxval(abs(wave(ia:ib)))
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rms=sqrt(dot_product(wave(ia:ib),wave(ia:ib))/NWAVE)
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nslots=1
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if(width.gt.0.0) call filt8(f0,nslots,width,wave)
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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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fac=32767.0
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rms=100.0
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if(snrdb.ge.90.0) iwave(1:NMAX)=nint(fac*wave)
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if(snrdb.lt.90.0) iwave(1:NMAX)=nint(rms*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 ft8sim2
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@ -9,16 +9,21 @@ USAGE:
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OPTIONS:
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-a <path> path to writeable data files, default="."
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-B disable block demodulation - use single-symbol noncoherent demod
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-c write .c2 file at the end of the first pass
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-C maximum number of decoder cycles per bit, default 10000
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-d deeper search. Slower, a few more decodes
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-e x (x is transceiver dial frequency error in Hz)
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-f x (x is transceiver dial frequency in MHz)
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-H do not use (or update) the hash table
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-J use the stack decoder instead of Fano decoder
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-m decode wspr-15 .wav file
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-o n (0<=n<=5), decoding depth for OSD, default is disabled
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-q quick mode - doesn't dig deep for weak signals
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-s single pass mode, no subtraction (same as original wsprd)
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-v verbose mode (shows dupes)
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-w wideband mode - decode signals within +/- 150 Hz of center
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-z x (x is fano metric table bias, default is 0.42)
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-z x (x is fano metric table bias, default is 0.45)
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infile can be either .wav or .c2
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@ -35,8 +40,19 @@ subband center frequency. The wideband option (-w) extends this to +/- 150 Hz.
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wsprd maintains a hashtable and will decode all three types of wspr
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messages. An option (-H) is available to turn off use of the hashtable.
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Decoding is attempted using soft symbols derived using single-symbol
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noncoherent detection. If decoding fails, then soft symbols derived using
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block demodulation over 2- and 3-symbol blocks are used in subsequent
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decoding attempts. For slower computers, block demodulation can be
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disabled with the -B command line option.
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The symbols are decoded using Phil Karn's sequential decoder routine,
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fano.c.
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fano.c. The -J option replaces the Fano algorithm with the Jelinek
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"stack-bucket" algorithm. If the -o command line option is enabled, then
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an ordered-statistics decoder (OSD) is invoked if the Fano (or Jelinek) algorithm
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fails. The OSD is a complete decoder, meaning that it always returns a codeword.
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A returned codeword is considered valid only if the unpacked decode contains
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a callsign that is already in the hashtable.
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NOTES:
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This program attempts to maximize the number of successful decodes per transmit
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