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https://github.com/saitohirga/WSJT-X.git
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6a8e4a7d01
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6804 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
121 lines
3.5 KiB
Fortran
121 lines
3.5 KiB
Fortran
program QRA65code
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! Provides examples of message packing, bit and symbol ordering,
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! QRA (63,12) encoding, and other necessary details of the QRA65
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! protocol. Also permits simple simulations to measure performance
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! on an AWGN channel with secure time and frequency synchronization.
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! Return codes from qra65_dec:
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! irc=0 [? ? ?] AP0 (decoding with no a-priori information)
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! irc=1 [CQ ? ?] AP27
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! irc=2 [CQ ? ] AP44
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! irc=3 [CALL ? ?] AP29
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! irc=4 [CALL ? ] AP45
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! irc=5 [CALL CALL ?] AP57
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use packjt
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character*22 msg,msg0,msg1,decoded,cok*3,bad*1,msgtype*10,arg*12
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integer dgen(12),sent(63),dec(12)
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real s3(0:63,1:63)
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include 'testmsg.f90'
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nargs=iargc()
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if(nargs.lt.1) then
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print*,'Usage: qra65code "message" [snr2500] [Nrpt]'
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print*,' qra65code -t [snr2500]'
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go to 999
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endif
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call getarg(1,msg) !Get message from command line
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snr2500=10.0
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if(nargs.ge.2) then
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call getarg(2,arg)
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read(arg,*) snr2500
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endif
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sig=sqrt(2.0)*10.0**(0.05*(snr2500+29.7))
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nmsg=1
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nrpt=1
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if(msg(1:2).eq."-t") then
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nmsg=NTEST
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else
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if(nargs.ge.3) then
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call getarg(3,arg)
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read(arg,*) nrpt
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endif
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endif
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write(*,1010)
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1010 format(" Message Decoded Err? Type rc"/77("-"))
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ngood=0
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nbad=0
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do nn=1,nrpt
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do imsg=1,nmsg
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if(nmsg.gt.1) msg=testmsg(imsg)
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call fmtmsg(msg,iz) !To upper, collapse mult blanks
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msg0=msg !Input message
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call chkmsg(msg,cok,nspecial,flip) !See if it includes "OOO" report
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msg1=msg !Message without "OOO"
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call packmsg(msg1,dgen,itype) !Pack message into 12 six-bit bytes
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msgtype=""
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if(itype.eq.1) msgtype="Std Msg"
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if(itype.eq.2) msgtype="Type 1 pfx"
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if(itype.eq.3) msgtype="Type 1 sfx"
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if(itype.eq.4) msgtype="Type 2 pfx"
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if(itype.eq.5) msgtype="Type 2 sfx"
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if(itype.eq.6) msgtype="Free text"
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call qra65_enc(dgen,sent) !Encode using QRA65
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! Generate a simulated s3() array with moderately high S/N
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do j=1,63
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do i=0,63
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x=gran()
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y=gran()
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s3(i,j)=x*x + y*y
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enddo
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k=sent(j)
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x=gran() + sig
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y=gran()
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s3(k,j)=x*x + y*y
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enddo
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call qra65_dec(s3,dec,irc) !Decode
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decoded=" "
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if(irc.ge.0) then
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call unpackmsg(dec,decoded) !Unpack the user message
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call fmtmsg(decoded,iz)
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else
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dec=0
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endif
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if(decoded.eq.msg0) then
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ngood=ngood+1
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else
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if(irc.ge.0) nbad=nbad+1
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endif
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ii=imsg
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if(nrpt.gt.1) ii=nn
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write(*,1020) ii,msg0,decoded,itype,msgtype,irc
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1020 format(i4,1x,a22,2x,a22,4x,i3,": ",a13,i3)
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enddo
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if(nmsg.eq.1 .and.nrpt.eq.1) then
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write(*,1030) dgen
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1030 format(/'Packed message, 6-bit symbols ',12i3) !Display packed symbols
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write(*,1040) sent
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1040 format(/'Information-carrying channel symbols'/(i5,20i3))
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write(*,1050) dec
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1050 format(/'Received message, 6-bit symbols ',12i3) !Display packed symbols
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endif
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enddo
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if(nrpt.gt.1) then
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write(*,1060) ngood,nrpt,nbad
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1060 format('Decoded messages:',i5,'/',i4,' Undetected errors:',i5)
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endif
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999 end program QRA65code
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