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cbc0eb0114
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6954 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
80 lines
1.8 KiB
Fortran
80 lines
1.8 KiB
Fortran
subroutine genmsk32(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*4 crpt,rpt(0:63)
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logical first
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integer itone(144)
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integer ig32(0:65536-1) !Codewords for Golay (24,12) code
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integer*1 codeword(32),bitseq(32)
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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,ig32
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if(first) then
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call ldpc32_table(ig32) !Define the Golay(24,12) codewords
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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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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, 0-31
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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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ncodeword=ig32(ig)
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! write(*,*) 'codeword is: ',ncodeword,'message is: ',ig,'report index: ',irpt,'hash: ',ihash
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do i=1,32
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codeword(i)=iand(1,ishft(ncodeword,1-i))
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enddo
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bitseq=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, 16
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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 genmsk32
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