subroutine genmsk32(msg,msgsent,ichk,itone,itype) use hashing character*22 msg,msgsent,hashmsg character*4 crpt,rpt(0:31) logical first integer itone(32) integer ig24(0:4096-1) !Codewords for Golay (24,12) code integer*1 codeword(24),bitseq(32) integer*1 s8r(8) data s8r/1,0,1,1,0,0,0,1/ data rpt /'-04 ','-03 ','-02 ','-01 ','+00 ','+01 ','+02 ','+03 ','+04 ', & '+05 ','+06 ','+07 ','+08 ','+09 ','+10 ', & 'R-04','R-03','R-02','R-01','R+00','R+01','R+02','R+03','R+04', & 'R+05','R+06','R+07','R+08','R+09','R+10', & 'RRR ','73 '/ data first/.true./ save first,ig24 if(first) then call golay24_table(ig24) !Define the Golay(24,12) codewords first=.false. endif itype=-1 msgsent='*** bad message ***' itone=0 i1=index(msg,'>') if(i1.lt.9) go to 900 call fmtmsg(msg,iz) crpt=msg(i1+2:i1+5) do i=0,31 if(crpt.eq.rpt(i)) go to 10 enddo go to 900 10 irpt=i !Report index, 0-31 if(ichk.lt.10000) then hashmsg=msg(2:i1-1)//' '//crpt call hash(hashmsg,22,ihash) ihash=iand(ihash,127) !7-bit hash ig=32*ihash + irpt !12-bit codeword else ig=ichk-10000 endif ncodeword=ig24(ig) !write(*,*) 'codeword is: ',ncodeword,'message is: ',ig,'report index: ',irpt,'hash: ',ihash do i=1,24 codeword(i)=iand(1,ishft(ncodeword,1-i)) enddo bitseq(1:8)=s8r bitseq(9:32)=codeword bitseq=2*bitseq-1 ! Map I and Q to tones. itone=0 do i=1, 16 itone(2*i-1)=(bitseq(2*i)*bitseq(2*i-1)+1)/2; itone(2*i)=-(bitseq(2*i)*bitseq(mod(2*i,32)+1)-1)/2; enddo ! Flip polarity itone=-itone+1 msgsent=msg itype=7 900 return end subroutine genmsk32