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Add some development routines.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8604 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
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commit
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57
lib/fsk4hf/genwsprdpsk.f90
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57
lib/fsk4hf/genwsprdpsk.f90
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@ -0,0 +1,57 @@
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subroutine genwsprdpsk(msg,msgsent,imessage)
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! Encode a WSPRDPSK message, producing array txwave().
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!
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use crc
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include 'wsprdpsk_params.f90'
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character*22 msg,msgsent
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character*64 cbits
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character*32 sbits
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integer iuniqueword0
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integer*1,target :: idat(9)
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integer*1 msgbits(68),codeword(ND)
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logical first
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integer ipreamble(16) !Freq estimation preamble
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integer isync(32) !Long sync vector
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integer imessage(NN)
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data ipreamble/1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1/
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data first/.true./
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data iuniqueword0/z'30C9E8AD'/
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save first,isync,ipreamble
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if(first) then
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write(sbits,'(b32.32)') iuniqueword0
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read(sbits,'(32i1)') isync(1:32)
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first=.false.
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endif
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idat=0
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call wqencode(msg,ntype0,idat) !Source encoding
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id7=idat(7)
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if(id7.lt.0) id7=id7+256
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id7=id7/64
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write(*,*) 'idat ',idat
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icrc=crc14(c_loc(idat),9)
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write(*,*) 'icrc: ',icrc
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write(*,'(a6,b16.16)') 'icrc: ',icrc
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call wqdecode(idat,msgsent,itype)
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print*,msgsent,itype
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write(cbits,1004) idat(1:6),id7,iand(icrc,z'3FFF')
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1004 format(6b8.8,b2.2,b14.14)
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msgbits=0
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read(cbits,1006) msgbits(1:64)
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1006 format(64i1)
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write(*,'(50i1,1x,14i1,1x,4i1)') msgbits
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call encode204(msgbits,codeword) !Encode the test message
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! Message structure:
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! d100 p16 d100
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imessage(1:100)=codeword(1:100)
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imessage(101:132)=isync
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imessage(133:232)=codeword(101:200)
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return
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end subroutine genwsprdpsk
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@ -227,7 +227,7 @@ do idb = 20,-18,-1
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endif
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endif
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enddo
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snr2500=db+10*log10(1.389/2500.0)
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snr2500=db+10*log10(200.0/116.0/2500.0)
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pberr=real(nberr)/(real(ntrials*N))
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write(*,"(f4.1,4x,f5.1,1x,i8,1x,i8,1x,i8,8x,f5.2,8x,e10.3)") db,snr2500,ngood,nue,nbadcrc,ss,pberr
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175
lib/fsk4hf/wsprdpsksim.f90
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175
lib/fsk4hf/wsprdpsksim.f90
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@ -0,0 +1,175 @@
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program wsprdpsksim
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! Generate simulated data for a 2-minute "WSPR-DPSK" mode. Output is saved
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! to a *.c2 or *.wav file.
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use wavhdr
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include 'wsprdpsk_params.f90' !Set various constants
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parameter (NMAX=120*12000)
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type(hdr) hwav !Header for .wav file
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character arg*12,fname*16
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character msg*22,msgsent*22
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complex c0(0:NMAX/NDOWN-1)
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complex c(0:NMAX/NDOWN-1)
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complex c0wav(0:NMAX-1)
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complex cwav(0:NMAX-1)
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real*8 fMHz
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integer imessage(NN)
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integer idemess(NN) !Differentially encoded message
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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: wsprdpsksim "message" f0 DT fsp del nwav nfiles snr'
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print*,'Example: wsprdpsksim "K1ABC FN42 30" 50 0.0 0.1 1.0 1 10 -33'
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go to 999
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endif
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call getarg(1,msg) !Message to be transmitted
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call getarg(2,arg)
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read(arg,*) f0 !Freq relative to WSPR-band center (Hz)
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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,*) nwav !1 for *.wav file, 0 for *.c2 file
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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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twopi=8.0*atan(1.0)
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pi=twopi/2.0
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fs=12000.0/NDOWN
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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baud=1.0/tt !Keying rate for "itone" symbols (baud)
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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(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*NSPS0/12000.0
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call genwsprdpsk(msg,msgsent,imessage) !Encode the message, get itone
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write(*,1000) f0,xdt,txt,snrdb,fspread,delay,nfiles,msgsent
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1000 format('f0:',f9.3,' DT:',f6.2,' txt:',f6.1,' SNR:',f6.1, &
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' fspread:',f6.1,' delay:',f6.1,' nfiles:',i3,2x,a22)
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! Assume 0'th message bit is 0
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imessage=2*imessage-1
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idemess(1)=-1*imessage(1)
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do i=2,NN
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idemess(i)=imessage(i-1)*imessage(i)
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enddo
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beta=1.0 ! excess bandwidth
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if(nwav.eq.0) then
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df=fs/(NMAX/NDOWN) !
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c=0
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bw=(1+beta)*baud/2.0
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bf=(1-beta)*baud/2.0
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iw=bw/df
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if=bf/df
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c(0:if-1)=1.0
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if(iw.gt.if) then
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do i=if,iw
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c(i)=((1.0+cos(pi*(i-if)/(iw-if)))/2.0)**0.5
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enddo
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endif
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c(NMAX/NDOWN-1:NMAX/NDOWN-iw:-1)=c(1:iw)
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istart=xdt/dt
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c0=0.0
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do i=1,NN
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c0(istart+(i-1)*200)=idemess(i)
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enddo
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call four2a(c0,NMAX/NDOWN,1,1,1)
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c0=c0*conjg(c)
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ic=f0/df
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c0=cshift(c0,-ic)
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call four2a(c0,NMAX/NDOWN,1,-1,1)
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xx=sum(abs(c0(istart:istart+(NN-1)*200)**2))/((NN-1)*200)
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c0=c0/sqrt(xx)
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call sgran()
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do ifile=1,nfiles
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c=c0
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if( fspread .ne. 0.0 .or. delay .ne. 0.0 ) then
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call watterson(c,NMAX/NDOWN,fs,delay,fspread)
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endif
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c=c*sig
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if(snrdb.lt.90) then
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do i=0,NMAX/NDOWN-1 !Add gaussian noise at specified SNR
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xnoise=gran()
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ynoise=gran()
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c(i)=c(i) + cmplx(xnoise,ynoise)
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enddo
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endif
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write(fname,1100) ifile
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1100 format('000000_',i4.4,'.c2')
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open(10,file=fname,status='unknown',access='stream')
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fMHz=10.1387d0
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nmin=2
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write(10) fname,nmin,fMHz,c !Save to *.c2 file
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close(10)
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enddo
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else
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fs=12000.0
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df=fs/NMAX
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dt=1/fs
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bandwidth_ratio=2500.0/(fs/2.0)
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sig=sqrt(bandwidth_ratio) * 10.0**(0.05*snrdb)
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if(snrdb.gt.90.0) sig=1.0
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cwav=0
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bw=(1+beta)*baud/2.0
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bf=(1-beta)*baud/2.0
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iw=bw/df
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if=bf/df
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cwav(0:if-1)=1.0
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if(iw.gt.if) then
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do i=if,iw
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cwav(i)=((1.0+cos(pi*(i-if)/(iw-if)))/2.0)**0.5
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enddo
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endif
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cwav(NMAX-1:NMAX-iw:-1)=cwav(1:iw)
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istart=xdt/dt
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c0wav=0.0
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do i=1,NN
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c0wav(istart+(i-1)*200*NDOWN)=idemess(i)
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enddo
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call four2a(c0wav,NMAX,1,1,1)
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c0wav=c0wav*conjg(cwav)
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ic=f0/df
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c0wav=cshift(c0wav,-ic)
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call four2a(c0wav,NMAX,1,-1,1)
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xx=sum(abs(c0wav(istart:istart+(NN-1)*200*NDOWN))**2)/((NN-1)*200*NDOWN)
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c0wav=c0wav/sqrt(xx)
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call sgran()
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do ifile=1,nfiles
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cwav=c0wav
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if( fspread .ne. 0.0 .or. delay .ne. 0.0 ) then
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call watterson(cwav,NMAX,fs,delay,fspread)
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endif
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cwav=cwav*sig
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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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iwave(i)=100*(real(cwav(i-1)) + xnoise)
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enddo
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endif
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hwav=default_header(12000,NMAX)
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write(fname,1102) ifile
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1102 format('000000_',i4.4,'.wav')
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open(10,file=fname,status='unknown',access='stream')
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write(10) hwav,iwave !Save to *.wav file
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close(10)
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enddo
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endif
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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,a16)
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999 end program wsprdpsksim
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