108 lines
2.5 KiB
Fortran
108 lines
2.5 KiB
Fortran
subroutine genwspr5(msg,msgsent,itone)
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! Encode a WSPR-LF message, producing array itone().
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use crc
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include 'wsprlf_params.f90'
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character*22 msg,msgsent
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character*60 cbits
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integer*1,target :: idat(9)
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integer*1 msgbits(KK),codeword(ND)
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logical first
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integer icw(ND)
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integer id(NS+ND)
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integer jd(NS+ND)
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integer isync(48) !Long sync vector
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integer ib13(13) !Barker 13 code
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integer itone(NN)
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integer*8 n8
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data ib13/1,1,1,1,1,-1,-1,1,1,-1,1,-1,1/
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data first/.true./
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save first,isync
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if(first) then
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n8=z'cbf089223a51'
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do i=1,48
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isync(i)=-1
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if(iand(n8,1).eq.1) isync(i)=1
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n8=n8/2
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enddo
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first=.false.
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endif
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idat=0
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call wqencode(msg,ntype0,idat) !Source encoding
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id7=idat(7)
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if(id7.lt.0) id7=id7+256
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id7=id7/64
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icrc=crc10(c_loc(idat),9) !Compute the 10-bit CRC
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idat(8)=icrc/256 !Insert CRC into idat(8:9)
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idat(9)=iand(icrc,255)
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call wqdecode(idat,msgsent,itype)
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write(cbits,1004) idat(1:6),id7,icrc
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1004 format(6b8.8,b2.2,b10.10)
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read(cbits,1006) msgbits
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1006 format(60i1)
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! call chkcrc10(msgbits,nbadcrc)
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! print*,msgsent,itype,crc10_check(c_loc(idat),9),nbadcrc
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call encode300(msgbits,codeword) !Encode the test message
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icw=2*codeword - 1 !NRZ codeword
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! Message structure:
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! I channel: R1 48*(S1+D1) S13 48*(D1+S1) R1
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! Q channel: R1 D204 R1
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! Generate QPSK with no offset, then shift the y array to get OQPSK.
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! I channel:
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n=0
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k=0
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do j=1,48 !Insert group of 48*(S1+D1)
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n=n+1
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id(n)=2*isync(j)
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k=k+1
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n=n+1
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id(n)=icw(k)
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enddo
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do j=1,13 !Insert Barker 13 code
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n=n+1
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id(n)=2*ib13(j)
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enddo
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do j=1,48 !Insert group of 48*(S1+D1)
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k=k+1
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n=n+1
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id(n)=icw(k)
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n=n+1
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id(n)=2*isync(j)
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enddo
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! Q channel
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do j=1,204
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k=k+1
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n=n+1
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id(n)=icw(k)
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enddo
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! Map I and Q to tones.
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n=0
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jz=(NS+ND+1)/2
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do j=1,jz-1
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jd(2*j-1)=id(j)/abs(id(j))
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jd(2*j)=id(j+jz)/abs(id(j+jz))
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enddo
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jd(NS+ND)=id(jz)/abs(id(jz))
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itone=0
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do j=1,jz-1
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itone(2*j+1)=(jd(2*j)*jd(2*j-1)+1)/2;
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itone(2*j+2)=-(jd(2*j)*jd(2*j+1)-1)/2;
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enddo
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itone(NS+ND+2)=jd(NS+ND) !### Is this correct ??? ###
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return
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end subroutine genwspr5
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