mirror of https://github.com/saitohirga/WSJT-X.git
80 lines
1.8 KiB
Fortran
80 lines
1.8 KiB
Fortran
subroutine genmsk32(msg,msgsent,ichk,itone,itype)
|
|
|
|
use hashing
|
|
character*22 msg,msgsent,hashmsg
|
|
character*4 crpt,rpt(0:63)
|
|
logical first
|
|
integer itone(144)
|
|
integer ig32(0:65536-1) !Codewords for Golay (24,12) code
|
|
integer*1 codeword(32),bitseq(32)
|
|
integer*1 s8r(8)
|
|
data s8r/1,0,1,1,0,0,0,1/
|
|
data first/.true./
|
|
save first,ig32
|
|
|
|
if(first) then
|
|
call ldpc32_table(ig32) !Define the Golay(24,12) codewords
|
|
do i=0,30
|
|
if( i.lt.5 ) then
|
|
write(rpt(i),'(a1,i2.2,a1)') '-',abs(i-5)
|
|
write(rpt(i+31),'(a2,i2.2,a1)') 'R-',abs(i-5)
|
|
else
|
|
write(rpt(i),'(a1,i2.2,a1)') '+',i-5
|
|
write(rpt(i+31),'(a2,i2.2,a1)') 'R+',i-5
|
|
endif
|
|
enddo
|
|
rpt(62)='RRR '
|
|
rpt(63)='73 '
|
|
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=0,63
|
|
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,1023) !10-bit hash
|
|
ig=64*ihash + irpt !6-bit report
|
|
else
|
|
ig=ichk-10000
|
|
endif
|
|
|
|
ncodeword=ig32(ig)
|
|
|
|
write(*,*) 'codeword is: ',ncodeword,'message is: ',ig,'report index: ',irpt,'hash: ',ihash
|
|
|
|
do i=1,32
|
|
codeword(i)=iand(1,ishft(ncodeword,1-i))
|
|
enddo
|
|
|
|
bitseq=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
|
|
|