2016-07-05 17:06:54 -04:00
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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(0:31)
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logical first
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2016-07-06 15:11:03 -04:00
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integer itone(144)
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2016-07-05 17:06:54 -04:00
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integer ig24(0:4096-1) !Codewords for Golay (24,12) code
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integer*1 codeword(24),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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2016-07-06 16:13:08 -04:00
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data rpt /'-04 ','-03 ','-02 ','-01 ','00 ','01 ','02 ','03 ','04 ', &
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'05 ','06 ','07 ','08 ','09 ','10 ', &
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'R-04','R-03','R-02','R-01','R00','R01','R02','R03','R04', &
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'R05','R06','R07','R08','R09','R10', &
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2016-07-05 17:06:54 -04:00
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'RRR ','73 '/
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data first/.true./
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save first,ig24
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if(first) then
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call golay24_table(ig24) !Define the Golay(24,12) codewords
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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=0,31
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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,127) !7-bit hash
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ig=32*ihash + irpt !12-bit codeword
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else
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ig=ichk-10000
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endif
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ncodeword=ig24(ig)
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!write(*,*) 'codeword is: ',ncodeword,'message is: ',ig,'report index: ',irpt,'hash: ',ihash
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do i=1,24
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codeword(i)=iand(1,ishft(ncodeword,1-i))
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enddo
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bitseq(1:8)=s8r
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bitseq(9:32)=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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