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Add some simulation tools for binary cpm with sequence detection.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8586 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke
parent
2786c20ba2
commit
67a41a9f1d
68
lib/fsk4hf/genwsprcpm.f90
Normal file
68
lib/fsk4hf/genwsprcpm.f90
Normal file
@ -0,0 +1,68 @@
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subroutine genwsprcpm(msg,msgsent,itone)
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! Encode a WSPRCPM message, producing array itone().
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!
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use crc
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include 'wsprcpm_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 icw(ND)
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integer id(NS+ND)
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integer jd(NS+ND)
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integer ipreamble(32) !Long sync vector
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integer isync(32) !Long sync vector
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integer itone(NN)
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integer*8 n8
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data ipreamble/1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1/
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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
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ipreamble=2*ipreamble-1
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isync=2*isync-1
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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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icw=2*codeword - 1 !NRZ codeword
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! Message structure:
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! s32 d200 p32
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itone(1:32)=isync
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itone(33:232)=icw
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itone(233:264)=ipreamble
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! do i=1,264
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! write(*,*) i,itone(i)
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! enddo
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return
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end subroutine genwsprcpm
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14
lib/fsk4hf/wsprcpm_params.f90
Normal file
14
lib/fsk4hf/wsprcpm_params.f90
Normal file
@ -0,0 +1,14 @@
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parameter (KK=64) !Information bits (50 + CRC14) ?
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parameter (ND=200) !Data symbols: LDPC (204,68), r=1/3, don't send last 4 bits
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parameter (NS=64) !Sync symbols (2x32)
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parameter (NN=NS+ND) !Total symbols (264)
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parameter (NSPS0=5300) !Samples per symbol at 12000 S/s
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parameter (NDOWN=53) !Downsample to 100 samples per symbol...
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parameter (NSPS=NSPS0/NDOWN) !Samples per symbol
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parameter (NZ=NSPS*NN) !Samples in baseband waveform
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parameter (NZ0=NSPS0*NN) !Samples in waveform at 12000 S/s
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parameter (NFFT1=4*NSPS,NH1=NFFT1/2)
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57
lib/fsk4hf/wsprcpm_wav.f90
Normal file
57
lib/fsk4hf/wsprcpm_wav.f90
Normal file
@ -0,0 +1,57 @@
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subroutine wsprcpm_wav(baud,xdt,h1,h2,f0,itone,snrdb,iwave)
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! Generate iwave() from itone().
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include 'wsprcpm_params.f90'
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parameter (NMAX=120*12000)
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integer itone(NN)
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integer*2 iwave(NMAX)
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real*8 twopi,dt,dphi0,dphi1,dphi,phi
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real dat(NMAX)
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twopi=8.d0*atan(1.d0)
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dt=1.d0/12000.d0
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dat=0.
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if(snrdb.lt.90) then
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do i=1,NMAX
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dat(i)=gran() !Generate gaussian noise
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enddo
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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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else
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sig=1.0
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endif
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dphi01=twopi*(f0-(h1/2.0d0)*baud)*dt
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dphi11=twopi*(f0+(h1/2.0d0)*baud)*dt
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dphi02=twopi*(f0-(h2/2.0d0)*baud)*dt
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dphi12=twopi*(f0+(h2/2.0d0)*baud)*dt
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phi=0.d0
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k=nint(xdt/dt)
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do j=1,NN
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if( mod(j,2).eq.0 ) then
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dphi0=dphi01
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dphi1=dphi11
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else
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dphi0=dphi02
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dphi1=dphi12
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endif
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dphi=dphi0
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if(itone(j).eq.1) dphi=dphi1
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if(k.eq.0) phi=-dphi
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do i=1,NSPS0
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k=k+1
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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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if(k.gt.0 .and. k.le.NMAX) dat(k)=dat(k) + sig*sin(xphi)
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enddo
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enddo
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fac=32767.0
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rms=100.0
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if(snrdb.ge.90.0) iwave=nint(fac*dat)
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if(snrdb.lt.90.0) iwave=nint(rms*dat)
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return
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end subroutine wsprcpm_wav
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571
lib/fsk4hf/wsprcpmd.f90
Normal file
571
lib/fsk4hf/wsprcpmd.f90
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@ -0,0 +1,571 @@
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program wsprcpmd
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! Decode WSPRCPM data read from *.c2 or *.wav files.
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! WSPRCPM is a WSPR-like mode based on full-response CPM.
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!
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! Modulation Capabilities include:
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! support for multi-h cpm with two modulation indexes: [h1,h2].
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! h1,h2 (modulation index) are variable; h1=h2=0.5 is MSK, h1=h2=1.0 is standard
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! fsk intended for noncoherent demodulation.
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! demodulator uses noncoherent sequence detection with variable window size.
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! symbol demodulation is done symbol-by-symbol - each symbol is
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! estimated using a data frame comprising N symbol intervals, where N can
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! be 1, 3, 5, 7, 9, 11. The central symbol is estimated and then the window
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! is stepped forward by one symbol.
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! soft symbols are decoded by log-domain belief propagation followed by ordered-
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! statistics decoding.
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!
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! Currently configured to use (204,68) r=1/3 LDPC code, regular column weight 3.
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! 50 data bits + 14 bit CRC + 4 "0" bits. The 4 "0" bits are unused bits that
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! are not transmitted. At the decoder, these bits are treated as "AP" bits.
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! This shortens the code to (200,64) r=0.32, slightly decreasing the code rate.
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!
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! Frame format is:
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! s32 d200 p32 (264) channel symbols
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!
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use crc
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include 'wsprcpm_params.f90'
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parameter(NMAX=120*12000)
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character arg*8,message*22,cbits*50,infile*80,fname*16,datetime*11
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character*120 data_dir
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character*32 uwbits
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character*68 dmsg
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complex csync(0:32*100-1) !Sync symbols only, from cbb
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complex cpreamble(0:32*100-1) !Sync symbols only, from cbb
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complex cp2(0:32*100-1)
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complex ctwks(0:32*100-1)
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complex ctwkp(0:32*100-1)
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complex c2(0:120*12000/53-1) !Complex waveform
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complex ctmp(0:4*32*100-1)
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complex cframe(0:264*100-1) !Complex waveform
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complex cd(0:264*100-1) !Complex waveform
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complex c1(0:9,1:2),c0(0:9,1:2)
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complex ccor(0:1,264)
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complex csum,cp(0:1,1:2),cterm
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complex ccohs(0:31)
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complex ccohp(0:31)
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real*8 fMHz
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real rxdata(ND),llr(204) !Soft symbols
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real sbits(264),sbits1(264),sbits3(264)
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real ps(0:8191),psbest(0:8191)
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integer iuniqueword0
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integer isync(32) !Unique word
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integer ipreamble(32) !Preamble vector
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integer ihdr(11)
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integer*2 iwave(NMAX) !Generated full-length waveform
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integer*1,target :: idat(9)
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integer*1 decoded(68),apmask(204),cw(204)
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integer*1 hbits(264),hbits1(264),hbits3(264)
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data ipreamble/1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1/
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data iuniqueword0/z'30C9E8AD'/
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write(uwbits,'(b32.32)') iuniqueword0
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read(uwbits,'(32i1)') isync
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ipreamble=2*ipreamble-1
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isync=2*isync-1
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fs=12000.0/NDOWN !Sample rate
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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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h1=0.80 !h=0.8 seems to be optimum for AWGN sensitivity (not for fading)
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h2=0.80
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twopi=8.0*atan(1.0)
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dphi11=twopi*baud*(h1/2.0)*dt
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dphi01=-twopi*baud*(h1/2.0)*dt
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dphi12=twopi*baud*(h2/2.0)*dt
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dphi02=-twopi*baud*(h2/2.0)*dt
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k=0
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phi=0.0
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do i=1,32
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if( mod(i,2) .eq. 0 ) then
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dphi1=dphi11
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dphi0=dphi01
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else
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dphi1=dphi12
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dphi0=dphi02
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endif
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dphi=dphi0
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if( isync(i) .eq. 1 ) dphi=dphi1
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do j=1,100
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phi=mod(phi+dphi,twopi)
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csync(k)=cmplx(cos(phi),sin(phi))
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k=k+1
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enddo
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enddo
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k=0
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phi=0.0
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do i=1,32
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if( mod(i,2) .eq. 0 ) then
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dphi1=dphi11
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dphi0=dphi01
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else
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dphi1=dphi12
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dphi0=dphi02
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endif
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dphi=dphi0
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if( ipreamble(i) .eq. 1 ) dphi=dphi1
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do j=1,100
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phi=mod(phi+dphi,twopi)
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cpreamble(k)=cmplx(cos(phi),sin(phi))
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k=k+1
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enddo
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enddo
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dphi1=twopi*baud*(h1/2.0)*dt*10 ! dt*10 is samp interval after downsample
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dphi2=twopi*baud*(h2/2.0)*dt*10 ! dt*10 is samp interval after downsample
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cp(1,1)=cmplx(cos(dphi1*10),sin(dphi1*10))
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cp(0,1)=conjg(cp(1,1))
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cp(1,2)=cmplx(cos(dphi2*10),sin(dphi2*10))
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cp(0,2)=conjg(cp(1,2))
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do j=1,2
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if( j.eq.1 ) then
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dphi=dphi1
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else
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dphi=dphi2
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endif
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phi0=0.0
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phi1=0.0
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do i=0,9
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c1(i,j)=cmplx(cos(phi1),sin(phi1))
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c0(i,j)=cmplx(cos(phi0),sin(phi0))
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phi1=mod(phi1+dphi,twopi)
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phi0=mod(phi0-dphi,twopi)
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enddo
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enddo
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: wsprcpmd [-a <data_dir>] [-f fMHz] [-c ncoh] file1 [file2 ...]'
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go to 999
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endif
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iarg=1
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data_dir="."
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call getarg(iarg,arg)
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if(arg(1:2).eq.'-a') then
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call getarg(iarg+1,data_dir)
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iarg=iarg+2
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endif
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call getarg(iarg,arg)
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if(arg(1:2).eq.'-f') then
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call getarg(iarg+1,arg)
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read(arg,*) fMHz
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iarg=iarg+2
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endif
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ncoh=1
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npdi=32
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if(arg(1:2).eq.'-c') then
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call getarg(iarg+1,arg)
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read(arg,*) ncoh
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iarg=iarg+2
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npdi=32/ncoh
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endif
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write(*,*) 'ncoh: ',ncoh,' npdi: ',npdi
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open(13,file=trim(data_dir)//'/ALL_WSPR.TXT',status='unknown', &
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position='append')
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xs1=0.0
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xs2=0.0
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fr1=0.0
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fr2=0.0
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nav=0
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ngood=0
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do ifile=iarg,nargs
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call getarg(ifile,infile)
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open(10,file=infile,status='old',access='stream')
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j1=index(infile,'.c2')
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j2=index(infile,'.wav')
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if(j1.gt.0) then
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read(10,end=999) fname,ntrmin,fMHz,c2
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read(fname(8:11),*) nutc
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write(datetime,'(i11)') nutc
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else if(j2.gt.0) then
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read(10,end=999) ihdr,iwave
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read(infile(j2-4:j2-1),*) nutc
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datetime=infile(j2-11:j2-1)
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call wsprcpm_downsample(iwave,c2)
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else
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print*,'Wrong file format?'
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go to 999
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endif
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close(10)
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fa=-100.0
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fb=100.0
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fs=12000.0/53.0
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npts=120*12000/53
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nsync=32
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call getcandidate2(c2,npts,fs,fa,fb,fc1,xsnr) !First approx for freq
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fcest=fc1
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do iii=1,2
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izero=226
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dphi=twopi*fcest*dt
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ctwks=cmplx(0.0,0.0)
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ctwkp=cmplx(0.0,0.0)
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phi=0
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do i=0,nsync*NSPS-1
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phi=mod(phi+dphi,twopi)
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ctwks(i)=csync(i)*cmplx(cos(phi),sin(phi))
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ctwkp(i)=cpreamble(i)*cmplx(cos(phi),sin(phi))
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enddo
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imax=100
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xcmax=-1e32
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do it = -imax,imax
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its=izero+it
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ccohs=0.0
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do k=0,npdi-1
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is=k*ncoh*nsps
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ccohs(k)=sum(c2(its+is:its+is+ncoh*nsps-1)*conjg(ctwks(is:is+ncoh*nsps-1)))
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ccohs(k)=ccohs(k)/(ncoh*nsps)
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enddo
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! term1=sum(abs(ccohs(0:npdi-1))**2)
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itp=izero+it+232*100
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ccohp=0.0
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do k=0,npdi-1
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is=k*ncoh*nsps
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ccohp(k)=sum(c2(itp+is:itp+is+ncoh*nsps-1)*conjg(ctwkp(is:is+ncoh*nsps-1)))
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ccohp(k)=ccohp(k)/(ncoh*nsps)
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enddo
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csum=0.0
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terms=0.0
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do n=1,npdi-1
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do k=n,npdi-1
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csum=csum+ccohs(k)*conjg(ccohs(k-n))
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enddo
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terms=terms+abs(csum)
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enddo
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csum=0.0
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termp=0.0
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do n=1,npdi-1
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do k=n,npdi-1
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csum=csum+ccohp(k)*conjg(ccohp(k-n))
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enddo
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termp=termp+abs(csum)
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enddo
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!write(23,*) it,terms,termp
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xmetric=sqrt(terms*termp)
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if( xmetric .gt. xcmax ) then
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xcmax=xmetric
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ibestt=it
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endif
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enddo
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istart=izero+ibestt
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if(iii .eq. 2) goto 887
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ctmp=0.0
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ctmp(0:32*100-1)=c2(istart+232*100:istart+264*100-1)*conjg(ctwkp)
|
||||
call four2a(ctmp,4*32*100,1,-1,1) !c2c FFT to freq domain
|
||||
xmax=0.0
|
||||
ctmp=cshift(ctmp,-200)
|
||||
do i=150,250
|
||||
xa=abs(ctmp(i))
|
||||
if(xa.gt.xmax) then
|
||||
ishift=i
|
||||
xmax=xa
|
||||
endif
|
||||
enddo
|
||||
dfp=1/(4*5300.0/12000.0*32)
|
||||
delta=(ishift-200)*dfp
|
||||
! need to add bounds protection
|
||||
xm1=abs(ctmp(ishift-1))
|
||||
x0=abs(ctmp(ishift))
|
||||
xp1=abs(ctmp(ishift+1))
|
||||
xint=(log(xm1)-log(xp1))/(log(xm1)+log(xp1)-2*log(x0))
|
||||
delta2=delta+xint*dfp/2.0
|
||||
fcest=fcest+delta2
|
||||
enddo
|
||||
|
||||
887 write(*,'(i4,i5,5(2x,f9.5))') ifile,istart,xcmax,fc1,fcest
|
||||
xdt=(istart-226)/100.0
|
||||
if(abs(xdt).le.0.1) ngood=ngood+1
|
||||
xs1=xs1+xdt
|
||||
xs2=xs2+xdt**2
|
||||
fr1=fr1+fc1
|
||||
fr2=fr2+fc1**2
|
||||
nav=nav+1
|
||||
!**************
|
||||
! fcest=0.0
|
||||
! istart=226
|
||||
|
||||
do ijitter=0,2
|
||||
io=ijitter
|
||||
if(ijitter.eq.2) io=-1
|
||||
cframe=c2(istart+io:istart+io+264*100-1)
|
||||
call downsample2(cframe,fcest,cd)
|
||||
|
||||
dts=10*dt
|
||||
s2=sum(cd*conjg(cd))/(10*264)
|
||||
cd=cd/sqrt(s2)
|
||||
|
||||
do nseq=1,7
|
||||
if( nseq.eq.1 ) then ! noncoherent single-symbol detection
|
||||
sbits1=0.0
|
||||
do ibit=1,264
|
||||
if( mod(ibit,2).eq.0 ) j=1
|
||||
if( mod(ibit,2).eq.1 ) j=2
|
||||
ib=(ibit-1)*10
|
||||
ccor(1,ibit)=sum(cd(ib:ib+9)*conjg(c1(0:9,j)))
|
||||
ccor(0,ibit)=sum(cd(ib:ib+9)*conjg(c0(0:9,j)))
|
||||
sbits1(ibit)=abs(ccor(1,ibit))-abs(ccor(0,ibit))
|
||||
hbits1(ibit)=0
|
||||
if(sbits1(ibit).gt.0) hbits1(ibit)=1
|
||||
enddo
|
||||
sbits=sbits1
|
||||
hbits=hbits1
|
||||
sbits3=sbits1
|
||||
hbits3=hbits1
|
||||
elseif( nseq.ge.2 ) then
|
||||
ps=0
|
||||
if( nseq.eq. 2 ) nbit=3
|
||||
if( nseq.eq. 3 ) nbit=5
|
||||
if( nseq.eq. 4 ) nbit=7
|
||||
if( nseq.eq. 5 ) nbit=9
|
||||
if( nseq.eq. 6 ) nbit=11
|
||||
if( nseq.eq. 7 ) nbit=13
|
||||
numseq=2**(nbit)
|
||||
do ibit=nbit/2+1,264-nbit/2
|
||||
ps=0.0
|
||||
pmax=0.0
|
||||
do iseq=0,numseq-1
|
||||
csum=0.0
|
||||
cterm=cmplx(1.0,0.0)
|
||||
k=1
|
||||
do i=nbit-1,0,-1
|
||||
ibb=iand(iseq/(2**i),1)
|
||||
csum=csum+ccor(ibb,ibit-(nbit/2+1)+k)*cterm
|
||||
if( mod(ibit-(nbit/2+1)+k,2) .eq. 0 ) j=1
|
||||
if( mod(ibit-(nbit/2+1)+k,2) .eq. 1 ) j=2
|
||||
cterm=cterm*conjg(cp(ibb,j))
|
||||
k=k+1
|
||||
enddo
|
||||
ps(iseq)=abs(csum)
|
||||
if( ps(iseq) .gt. pmax ) then
|
||||
pmax=ps(iseq)
|
||||
ibflag=1
|
||||
endif
|
||||
enddo
|
||||
if( ibflag .eq. 1 ) then
|
||||
psbest=ps
|
||||
ibflag=0
|
||||
endif
|
||||
call getmetric2(2**(nbit/2),psbest,numseq,sbits3(ibit))
|
||||
hbits3(ibit)=0
|
||||
if(sbits3(ibit).gt.0) hbits3(ibit)=1
|
||||
enddo
|
||||
sbits=sbits3
|
||||
hbits=hbits3
|
||||
endif
|
||||
rxdata(1:200)=sbits(33:232)
|
||||
rxav=sum(rxdata(1:200))/200.0
|
||||
rx2av=sum(rxdata(1:200)*rxdata(1:200))/200.0
|
||||
rxsig=sqrt(rx2av-rxav*rxav)
|
||||
rxdata=rxdata/rxsig
|
||||
sigma=0.90
|
||||
llr(201:204)=-5.0
|
||||
llr(1:200)=2*rxdata/(sigma*sigma)
|
||||
apmask=0
|
||||
apmask(201:204)=1
|
||||
max_iterations=40
|
||||
ifer=0
|
||||
call bpdecode204(llr,apmask,max_iterations,decoded,cw,nharderror,niterations)
|
||||
nhardmin=-1
|
||||
if(nharderror.lt.0) call osd204(llr,apmask,5,decoded,cw,nhardmin,dmin)
|
||||
if(sum(decoded).eq.0) cycle
|
||||
if(nhardmin.ge.0 .or. nharderror.ge.0) then
|
||||
idat=0
|
||||
write(dmsg,'(68i1)') decoded
|
||||
read(dmsg(1:50),'(6b8.8,b2.2)') idat(1:7)
|
||||
idat(7)=idat(7)*64
|
||||
read(dmsg(51:64),'(b14.14)') ndec_crc
|
||||
ncalc_crc=iand(crc14(c_loc(idat),9),z'FFFF')
|
||||
nbadcrc=1
|
||||
if(ncalc_crc .eq. ndec_crc) nbadcrc=0
|
||||
else
|
||||
cycle
|
||||
endif
|
||||
if( nbadcrc.eq.0 ) then
|
||||
write(cbits,1200) decoded(1:50)
|
||||
1200 format(50i1)
|
||||
read(cbits,1202) idat
|
||||
1202 format(8b8,b4)
|
||||
idat(7)=ishft(idat(7),6)
|
||||
call wqdecode(idat,message,itype)
|
||||
nsnr=nint(xsnr)
|
||||
freq=fMHz + 1.d-6*(fc1+fbest)
|
||||
nfdot=0
|
||||
write(13,1210) datetime,0,nsnr,xdt,freq,message,nfdot
|
||||
1210 format(a11,2i4,f6.2,f12.7,2x,a22,i3)
|
||||
write(*,1212) datetime(8:11),nsnr,xdt,freq,nfdot,message,'*',idf,nseq,ijitter,nharderror,nhardmin
|
||||
1212 format(a4,i4,f5.1,f11.6,i3,2x,a22,a1,i5,i5,i5,i5,i5)
|
||||
goto 888
|
||||
endif
|
||||
enddo ! nseq
|
||||
enddo !jitter
|
||||
888 continue
|
||||
enddo !files
|
||||
|
||||
avshift=xs1/nav
|
||||
varshift=xs2/nav
|
||||
stdshift=sqrt(varshift-avshift**2)
|
||||
avfr=fr1/nav
|
||||
varfr=fr2/nav
|
||||
stdfr=sqrt(varfr-avfr**2)
|
||||
write(*,*) 'ngood: ',ngood
|
||||
write(*,'(a7,f7.3,f7.3)') 'shift: ',avshift,stdshift
|
||||
write(*,*) 'freq: ',avfr,stdfr
|
||||
|
||||
write(*,1120)
|
||||
1120 format("<DecodeFinished>")
|
||||
|
||||
999 end program wsprcpmd
|
||||
|
||||
subroutine getmetric2(ib,ps,ns,xmet)
|
||||
real ps(0:ns-1)
|
||||
xm1=0
|
||||
xm0=0
|
||||
do i=0,ns-1
|
||||
if( iand(i/ib,1) .eq. 1 .and. ps(i) .gt. xm1 ) xm1=ps(i)
|
||||
if( iand(i/ib,1) .eq. 0 .and. ps(i) .gt. xm0 ) xm0=ps(i)
|
||||
enddo
|
||||
xmet=xm1-xm0
|
||||
return
|
||||
end subroutine getmetric2
|
||||
|
||||
subroutine downsample2(ci,f0,co)
|
||||
parameter(NI=264*100,NH=NI/2,NO=NI/10) ! downsample from 100 samples per symbol to 10
|
||||
complex ci(0:NI-1),ct(0:NI-1)
|
||||
complex co(0:NO-1)
|
||||
fs=12000.0/53.0
|
||||
df=fs/NI
|
||||
ct=ci
|
||||
call four2a(ct,NI,1,-1,1) !c2c FFT to freq domain
|
||||
i0=nint(f0/df)
|
||||
ct=cshift(ct,i0)
|
||||
co=0.0
|
||||
co(0)=ct(0)
|
||||
! b=3.4*0.875/0.715
|
||||
! b=2.6*0.5625/0.715
|
||||
b=12.0
|
||||
do i=1,NO/2
|
||||
arg=(i*df/b)**2
|
||||
filt=exp(-arg)
|
||||
! filt=0.0
|
||||
! if( i*df .le. b ) filt=1.0
|
||||
co(i)=ct(i)*filt
|
||||
co(NO-i)=ct(NI-i)*filt
|
||||
enddo
|
||||
co=co/NO
|
||||
call four2a(co,NO,1,1,1) !c2c FFT back to time domain
|
||||
return
|
||||
end subroutine downsample2
|
||||
|
||||
subroutine getcandidate2(c,npts,fs,fa,fb,fc1,xsnr)
|
||||
parameter(NDAT=100,NFFT1=8*NDAT,NH1=NFFT1/2)
|
||||
complex c(0:npts-1) !Complex waveform
|
||||
complex c2(0:NFFT1-1) !Short spectra
|
||||
real s(-NH1+1:NH1) !Coarse spectrum
|
||||
real ss(-NH1+1:NH1) !Smoothed coarse spectrum
|
||||
real w(0:NFFT1-1)
|
||||
real pi
|
||||
logical first
|
||||
data first/.true./
|
||||
save first,w
|
||||
|
||||
if(first) then
|
||||
pi=4.0*atan(1.0)
|
||||
do i=0,NFFT1-1
|
||||
w(i)=sin(pi*i/(NDAT-1))**2
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
nspec=int((npts-NFFT1)/NDAT)+1
|
||||
df1=fs/NFFT1
|
||||
s=0.
|
||||
do k=1,nspec
|
||||
ia=(k-1)*NDAT
|
||||
ib=ia+NFFT1-1
|
||||
c2(0:NFFT1-1)=c(ia:ib)*w
|
||||
call four2a(c2,NFFT1,1,-1,1)
|
||||
do i=0,NFFT1-1
|
||||
j=i
|
||||
if(j.gt.NH1) j=j-NFFT1
|
||||
s(j)=s(j) + real(c2(i))**2 + aimag(c2(i))**2
|
||||
enddo
|
||||
enddo
|
||||
do i=-NH1+1+4,NH1-4
|
||||
ss(i)=sum(s(i-4:i+4))/9.0
|
||||
enddo
|
||||
! do i=-NH1+1+8,NH1-8
|
||||
! ss(i)=sum(ss(i-4:i+4))/9.0
|
||||
! enddo
|
||||
do i=-20,20
|
||||
write(52,*) i*df1,ss(i)
|
||||
enddo
|
||||
|
||||
smax=0.
|
||||
ipk=0
|
||||
fc1=0.
|
||||
ia=nint(fa/df1)
|
||||
ib=nint(fb/df1)
|
||||
do i=ia,ib
|
||||
f=i*df1
|
||||
if(ss(i).gt.smax) then
|
||||
smax=ss(i)
|
||||
ipk=i
|
||||
fc1=f
|
||||
endif
|
||||
enddo
|
||||
|
||||
xint=(log(ss(ipk-1))-log(ss(ipk+1)))/(log(ss(ipk-1))+log(ss(ipk+1))-2*log(ss(ipk)))
|
||||
fc1=fc1+xint*df1/2.0
|
||||
! The following is for testing SNR calibration:
|
||||
sp3n=sum(s(ipk-5:ipk+5))
|
||||
base=(sum(s)-sp3n)/(NFFT1-11.0)
|
||||
psig=sp3n-11*base
|
||||
pnoise=(2500.0/df1)*base
|
||||
xsnr=db(psig/pnoise)
|
||||
return
|
||||
end subroutine getcandidate2
|
||||
|
||||
subroutine wsprcpm_downsample(iwave,c)
|
||||
|
||||
! Input: i*2 data in iwave() at sample rate 12000 Hz
|
||||
! Output: Complex data in c(), sampled at 400 Hz
|
||||
|
||||
include 'wsprcpm_params.f90'
|
||||
parameter (NMAX=120*12000,NFFT2=NMAX/53)
|
||||
integer*2 iwave(NMAX)
|
||||
complex c(0:NZ-1)
|
||||
complex c1(0:NFFT2-1)
|
||||
complex cx(0:NMAX/2)
|
||||
real x(NMAX)
|
||||
equivalence (x,cx)
|
||||
|
||||
df=12000.0/NMAX
|
||||
x=iwave
|
||||
call four2a(x,NMAX,1,-1,0) !r2c FFT to freq domain
|
||||
i0=nint(1500.0/df)
|
||||
c1(0)=cx(i0)
|
||||
do i=1,NFFT2/2
|
||||
c1(i)=cx(i0+i)
|
||||
c1(NFFT2-i)=cx(i0-i)
|
||||
enddo
|
||||
c1=c1/NFFT2
|
||||
call four2a(c1,NFFT2,1,1,1) !c2c FFT back to time domain
|
||||
c=c1(0:NZ-1)
|
||||
|
||||
return
|
||||
end subroutine wsprcpm_downsample
|
||||
|
||||
124
lib/fsk4hf/wsprcpmsim.f90
Normal file
124
lib/fsk4hf/wsprcpmsim.f90
Normal file
@ -0,0 +1,124 @@
|
||||
program wsprcpmsim
|
||||
|
||||
! Generate simulated data for a 2-minute "WSPR-LF" mode. Output is saved
|
||||
! to a *.c2 or *.wav file.
|
||||
|
||||
use wavhdr
|
||||
include 'wsprcpm_params.f90' !Set various constants
|
||||
parameter (NMAX=120*12000)
|
||||
type(hdr) hwav !Header for .wav file
|
||||
character arg*12,fname*16
|
||||
character msg*22,msgsent*22
|
||||
complex c0(0:NMAX/NDOWN-1)
|
||||
complex c(0:NMAX/NDOWN-1)
|
||||
real*8 fMHz
|
||||
integer itone(NN)
|
||||
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||
|
||||
! Get command-line argument(s)
|
||||
nargs=iargc()
|
||||
if(nargs.ne.8) then
|
||||
print*,'Usage: wsprmsksim "message" f0 DT fsp del nwav nfiles snr'
|
||||
print*,'Example: wsprmsksim "K1ABC FN42 30" 50 0.0 0.1 1.0 1 10 -33'
|
||||
go to 999
|
||||
endif
|
||||
call getarg(1,msg) !Message to be transmitted
|
||||
call getarg(2,arg)
|
||||
read(arg,*) f0 !Freq relative to WSPR-band center (Hz)
|
||||
call getarg(3,arg)
|
||||
read(arg,*) xdt !Time offset from nominal (s)
|
||||
call getarg(4,arg)
|
||||
read(arg,*) fspread !Watterson frequency spread (Hz)
|
||||
call getarg(5,arg)
|
||||
read(arg,*) delay !Watterson delay (ms)
|
||||
call getarg(6,arg)
|
||||
read(arg,*) nwav !1 for *.wav file, 0 for *.c2 file
|
||||
call getarg(7,arg)
|
||||
read(arg,*) nfiles !Number of files
|
||||
call getarg(8,arg)
|
||||
read(arg,*) snrdb !SNR_2500
|
||||
|
||||
twopi=8.0*atan(1.0)
|
||||
fs=12000.0/NDOWN !
|
||||
dt=1.0/fs !Sample interval (s)
|
||||
tt=NSPS*dt !Duration of "itone" symbols (s)
|
||||
ts=2*NSPS*dt !Duration of OQPSK symbols (s)
|
||||
baud=1.0/tt !Keying rate for "itone" symbols (baud)
|
||||
txt=NZ*dt !Transmission length (s)
|
||||
bandwidth_ratio=2500.0/(fs/2.0)
|
||||
sig=sqrt(bandwidth_ratio) * 10.0**(0.05*snrdb)
|
||||
if(snrdb.gt.90.0) sig=1.0
|
||||
txt=NN*NSPS0/12000.0
|
||||
|
||||
call genwsprcpm(msg,msgsent,itone) !Encode the message, get itone
|
||||
write(*,1000) f0,xdt,txt,snrdb,fspread,delay,nfiles,msgsent
|
||||
1000 format('f0:',f9.3,' DT:',f6.2,' txt:',f6.1,' SNR:',f6.1, &
|
||||
' fspread:',f6.1,' delay:',f6.1,' nfiles:',i3,2x,a22)
|
||||
|
||||
h1=0.80
|
||||
h2=0.80
|
||||
dphi11=twopi*(f0+(h1/2.0)*baud)*dt
|
||||
dphi01=twopi*(f0-(h1/2.0)*baud)*dt
|
||||
dphi12=twopi*(f0+(h2/2.0)*baud)*dt
|
||||
dphi02=twopi*(f0-(h2/2.0)*baud)*dt
|
||||
phi=0.0
|
||||
c0=0.
|
||||
k=-1 + nint(xdt/dt)
|
||||
do j=1,NN
|
||||
if( mod(j,2) .eq. 0 ) then
|
||||
dphi1=dphi11
|
||||
dphi0=dphi01
|
||||
else
|
||||
dphi1=dphi12
|
||||
dphi0=dphi02
|
||||
endif
|
||||
dp=dphi1
|
||||
if(itone(j).eq.-1) dp=dphi0
|
||||
do i=1,NSPS
|
||||
k=k+1
|
||||
phi=mod(phi+dp,twopi)
|
||||
if(k.ge.0 .and. k.lt.NMAX/NDOWN) c0(k)=cmplx(cos(phi),sin(phi))
|
||||
enddo
|
||||
enddo
|
||||
call sgran()
|
||||
do ifile=1,nfiles
|
||||
c=c0
|
||||
if(nwav.eq.0) then
|
||||
if( fspread .ne. 0.0 .or. delay .ne. 0.0 ) then
|
||||
call watterson(c,NMAX/NDOWN,fs,delay,fspread)
|
||||
endif
|
||||
!do i=0,NMAX/NDOWN-1
|
||||
!write(23,*) i,real(c(i)),imag(c(i))
|
||||
!enddo
|
||||
c=c*sig
|
||||
if(snrdb.lt.90) then
|
||||
do i=0,NMAX/NDOWN-1 !Add gaussian noise at specified SNR
|
||||
xnoise=gran()
|
||||
ynoise=gran()
|
||||
c(i)=c(i) + cmplx(xnoise,ynoise)
|
||||
enddo
|
||||
endif
|
||||
write(fname,1100) ifile
|
||||
1100 format('000000_',i4.4,'.c2')
|
||||
open(10,file=fname,status='unknown',access='stream')
|
||||
fMHz=10.1387d0
|
||||
nmin=2
|
||||
write(10) fname,nmin,fMHz,c !Save to *.c2 file
|
||||
close(10)
|
||||
!do i=0,NMAX/NDOWN-1
|
||||
!write(57,*) i,real(c(i)),imag(c(i))
|
||||
!enddo
|
||||
else
|
||||
call wsprcpm_wav(baud,xdt,h1,h2,f0,itone,snrdb,iwave)
|
||||
hwav=default_header(12000,NMAX)
|
||||
write(fname,1102) ifile
|
||||
1102 format('000000_',i4.4,'.wav')
|
||||
open(10,file=fname,status='unknown',access='stream')
|
||||
write(10) hwav,iwave !Save to *.wav file
|
||||
close(10)
|
||||
endif
|
||||
write(*,1110) ifile,xdt,f0,snrdb,fname
|
||||
1110 format(i4,f7.2,f8.2,f7.1,2x,a16)
|
||||
enddo
|
||||
|
||||
999 end program wsprcpmsim
|
||||
Loading…
Reference in New Issue
Block a user