SVN r8748
This commit is contained in:
Jordan Sherer
@@ -0,0 +1,109 @@
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program wsprcpmsim
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! Generate simulated data for a 2-minute "WSPR-LF" 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 'wsprcpm_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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real*8 fMHz
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integer itone(NN)
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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: wsprmsksim "message" f0 DT fsp del nwav nfiles snr'
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print*,'Example: wsprmsksim "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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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 genwsprcpm(msg,msgsent,itone) !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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h=1.00
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c0=0.
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k=-1 + nint(xdt/dt)
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do j=1,NN
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dp=twopi*(f0+itone(j)*(h/2.0)*baud)*dt
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do i=1,NSPS
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k=k+1
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phi=mod(phi+dp,twopi)
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if(k.ge.0 .and. k.lt.NMAX/NDOWN) c0(k)=cmplx(cos(phi),sin(phi))
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enddo
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enddo
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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(nwav.eq.0) then
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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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!do i=0,NMAX/NDOWN-1
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!write(23,*) i,real(c(i)),imag(c(i))
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!enddo
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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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!do i=0,NMAX/NDOWN-1
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!write(57,*) i,real(c(i)),imag(c(i))
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!enddo
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else
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call wsprcpm_wav(baud,xdt,h,f0,itone,snrdb,iwave)
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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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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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enddo
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999 end program wsprcpmsim
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@@ -1,99 +0,0 @@
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<HTML><HEAD>
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<TITLE> Detailed Decoding Trace Information </TITLE>
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</HEAD><BODY>
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<H1> Detailed Decoding Trace Information </H1>
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The <B>-T</B> option to <A HREF="decoding.html#decode"><TT>decode</TT></A>
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causes a detailed trace of information on the process of decoding to
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be written to standard output, in a multi-column format, with the first
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line containing the headers for each column. This format is suitable
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for reading into S-Plus or R.
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The first column is always the number of the block being decoded;
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several lines may be output for each block. The other columns vary
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with the decoding method used, as described below.
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<H2>Enum-bit and Enum-block decoding methods</H2>
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For source messages with <I>K</I> bits, 2<SUP><I>K</I></SUP> lines are output
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for each block, containing the following information:
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<BLOCKQUOTE>
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<TABLE>
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<tr align="left" valign="top">
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<td> <B>block</B> </td>
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<td>The number of the block, from zero</td></tr>
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<tr align="left" valign="top">
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<td> <B>decoding</B> </td>
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<td>A possible decoding for the message bits, expressed as a hexadecimal
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number. The other bits are determined by the message bits.</td></tr>
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<tr align="left" valign="top">
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<td> <B>likelihood</B> </td>
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<td>The likelihood for this decoding (ie, the probability of obtaining
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the data received if this was the message sent).</td></tr>
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</TABLE>
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</BLOCKQUOTE>
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For these methods, the number of "iterations" (output with the
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<B>-t</B> option) is always 2<SUP><I>K</I></SUP>.
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<H2>Prprp decoding method</H2>
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Each block results in one line of output for the initial state (based
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on individual likelihood ratios), and one line for each subsequent
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iteration, containing the following information:
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<BLOCKQUOTE>
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<TABLE>
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<tr align="left" valign="top">
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<td> <B>block</B> </td>
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<td>The number of the block, from zero</td></tr>
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<tr align="left" valign="top">
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<td> <B>iter</B> </td>
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<td>The number of an iteration, zero for the initial state.</td></tr>
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<tr align="left" valign="top">
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<td> <B>changed</B> </td>
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<td>The number of bits in the decoding that differ from the bit that would
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be chosen based just on the likelihood ratio for that bit. Bits whose
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likelihood ratios are exactly one contribute 0.5 to this
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count. (Likelihood ratios of exactly one can arise when the output
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of an AWGN channel rounds to exactly 0.00.)</td></tr>
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<tr align="left" valign="top">
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<td> <B>perrs</B> </td>
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<td>The number of parity check errors in the current tentative
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decoding.</td></tr>
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<tr align="left" valign="top">
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<td> <B>loglik</B> </td>
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<td>The log likelihood of the current tentative decoding.</td></tr>
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<tr align="left" valign="top">
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<td> <B>Eperrs</B> </td>
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<td>The expected number of parity check errors in a decoding found
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by randomly picking a value for each bit, independently, according
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to the current bit probabilities.</td></tr>
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<tr align="left" valign="top">
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<td> <B>Eloglik</B> </td>
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<td>The expected log likelihood of a decoding found by randomly picking
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a value for each bit, independently, according to the current bit
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probabilities.
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</td></tr>
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<tr align="left" valign="top">
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<td> <B>entropy</B> </td>
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<td>The entropy (in bits) of the distribution defined by the current bit
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probablities, assumed to apply to bits independently.</td></tr>
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</TABLE>
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</BLOCKQUOTE>
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The number of "iterations" (output with the <B>-t</B> option) is
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the obvious count of probability propagation iterations. The
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initial state does not count as an iteration.
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<HR>
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<A HREF="decoding.html">Back to decoding documentation</A><BR>
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<A HREF="index.html">Back to index for LDPC software</A>
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</BODY></HTML>
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