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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6966 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
93 lines
2.2 KiB
Fortran
93 lines
2.2 KiB
Fortran
subroutine genmsk40(msg,msgsent,ichk,itone,itype)
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use hashing
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character*22 msg,msgsent,hashmsg
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character*32 cwstring
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character*2 cwstrbit
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character*4 crpt,rpt(0:63)
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character*40 pchk_file,gen_file
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logical first
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integer itone(144)
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integer*1 message(16),codeword(32),bitseq(40)
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integer*1 s8r(8)
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data s8r/1,0,1,1,0,0,0,1/
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data first/.true./
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save first,rpt
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if(first) then
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do i=0,30
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if( i.lt.5 ) then
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write(rpt(i),'(a1,i2.2,a1)') '-',abs(i-5)
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write(rpt(i+31),'(a2,i2.2,a1)') 'R-',abs(i-5)
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else
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write(rpt(i),'(a1,i2.2,a1)') '+',i-5
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write(rpt(i+31),'(a2,i2.2,a1)') 'R+',i-5
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endif
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enddo
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rpt(62)='RRR '
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rpt(63)='73 '
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first=.false.
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endif
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!####### TEMPORARILY HARDWIRE PCHK AND GEN FILES ##################
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!These files will need to be installed.
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pchk_file="peg-32-16-reg3.pchk"
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gen_file="peg-32-16-reg3.gen"
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call init_ldpc(trim(pchk_file)//char(0),trim(gen_file)//char(0))
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itype=-1
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msgsent='*** bad message ***'
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itone=0
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i1=index(msg,'>')
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if(i1.lt.9) go to 900
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call fmtmsg(msg,iz)
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crpt=msg(i1+2:i1+5)
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do i=0,63
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if(crpt.eq.rpt(i)) go to 10
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enddo
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go to 900
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10 irpt=i !Report index, 0-63
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if(ichk.lt.10000) then
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hashmsg=msg(2:i1-1)//' '//crpt
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call hash(hashmsg,22,ihash)
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ihash=iand(ihash,1023) !10-bit hash
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ig=64*ihash + irpt !6-bit report
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else
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ig=ichk-10000
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endif
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do i=1,16
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message(i)=iand(1,ishft(ig,1-i))
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enddo
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call ldpc_encode(message,codeword)
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cwstring=" "
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do i=1,32
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write(cwstrbit,'(i2)') codeword(i)
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cwstring=cwstring//cwstrbit
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enddo
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write(*,'(a6,i6,2x,a6,i6,2x,a6,i6)') ' msg: ',ig,'rprt: ',irpt,'hash: ',ihash
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write(*,'(a6,32i1)') ' cw: ',codeword
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bitseq(1:8)=s8r
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bitseq(9:40)=codeword
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bitseq=2*bitseq-1
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! Map I and Q to tones.
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itone=0
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do i=1, 20
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itone(2*i-1)=(bitseq(2*i)*bitseq(2*i-1)+1)/2;
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itone(2*i)=-(bitseq(2*i)*bitseq(mod(2*i,32)+1)-1)/2;
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enddo
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! Flip polarity
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itone=-itone+1
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msgsent=msg
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itype=7
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900 return
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end subroutine genmsk40
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