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Change msk32 messages to (32,16) code (no sync word) with 6-bit report and 10-bit hash. No decoder yet.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6952 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2016-07-26 23:14:30 +00:00
parent edc57a7d64
commit 7b54487b91
2 changed files with 53 additions and 19 deletions
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42
lib/genmsk32.f90
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@ -2,24 +2,29 @@ subroutine genmsk32(msg,msgsent,ichk,itone,itype)
use hashing use hashing
character*22 msg,msgsent,hashmsg character*22 msg,msgsent,hashmsg
character*4 crpt,rpt(0:31) character*4 crpt,rpt(0:63)
logical first logical first
integer itone(144) integer itone(144)
integer ig24(0:4096-1) !Codewords for Golay (24,12) code integer ig32(0:65536-1) !Codewords for Golay (24,12) code
integer*1 codeword(24),bitseq(32) integer*1 codeword(32),bitseq(32)
integer*1 s8r(8) integer*1 s8r(8)
data s8r/1,0,1,1,0,0,0,1/ data s8r/1,0,1,1,0,0,0,1/
data rpt /'-04 ','-02 ','+00 ','+02 ','+04 ','+06 ','+08 ','+10 ','+12 ', &
'+14 ','+16 ','+18 ','+20 ','+22 ','+24 ', &
'R-04','R-02','R+00','R+02','R+04','R+06','R+08','R+10','R+12', &
'R+14','R+16','R+18','R+20','R+22','R+24', &
'RRR ','73 '/
data first/.true./ data first/.true./
save first,ig24 save first,ig32
if(first) then if(first) then
call golay24_table(ig24) !Define the Golay(24,12) codewords 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. first=.false.
endif endif
@ -30,7 +35,7 @@ subroutine genmsk32(msg,msgsent,ichk,itone,itype)
if(i1.lt.9) go to 900 if(i1.lt.9) go to 900
call fmtmsg(msg,iz) call fmtmsg(msg,iz)
crpt=msg(i1+2:i1+5) crpt=msg(i1+2:i1+5)
do i=0,31 do i=0,63
if(crpt.eq.rpt(i)) go to 10 if(crpt.eq.rpt(i)) go to 10
enddo enddo
go to 900 go to 900
@ -39,22 +44,21 @@ subroutine genmsk32(msg,msgsent,ichk,itone,itype)
if(ichk.lt.10000) then if(ichk.lt.10000) then
hashmsg=msg(2:i1-1)//' '//crpt hashmsg=msg(2:i1-1)//' '//crpt
call hash(hashmsg,22,ihash) call hash(hashmsg,22,ihash)
ihash=iand(ihash,127) !7-bit hash ihash=iand(ihash,1023) !10-bit hash
ig=32*ihash + irpt !12-bit codeword ig=64*ihash + irpt !6-bit report
else else
ig=ichk-10000 ig=ichk-10000
endif endif
ncodeword=ig24(ig) ncodeword=ig32(ig)
! write(*,*) 'codeword is: ',ncodeword,'message is: ',ig,'report index: ',irpt,'hash: ',ihash write(*,*) 'codeword is: ',ncodeword,'message is: ',ig,'report index: ',irpt,'hash: ',ihash
do i=1,24 do i=1,32
codeword(i)=iand(1,ishft(ncodeword,1-i)) codeword(i)=iand(1,ishft(ncodeword,1-i))
enddo enddo
bitseq(1:8)=s8r bitseq=codeword
bitseq(9:32)=codeword
bitseq=2*bitseq-1 bitseq=2*bitseq-1
! Map I and Q to tones. ! Map I and Q to tones.

30
lib/ldpc32_table.c Normal file
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@ -0,0 +1,30 @@
void ldpc32_table_(int cw[])
{
// Compute and return the table of 65535 codewords for the (32,16) code.
// Array y contains the sixteen rows (columns) of the parity-check matrix
int y[16] = { 0xd452, 0x7ecb, 0xc5d5, 0xf81c,
0x61d7, 0x0ed8, 0xa3c5, 0x9ef9,
0xb3bd, 0xe5b6, 0x2fcd, 0xc23a,
0x5deb, 0xfa0e, 0x35fc, 0x1379 };
unsigned int c[2]; /* Codeword composed of 16-bit info and 16-bit parity */
int i,j,k;
int aux;
int weight(int vector);
for(k=0; k<65536; k++) {
c[0] = k;
c[1] = 0;
for (i=0; i<16; i++) {
aux = 0;
for (j=0; j<16; j++) {
aux = aux ^ ((c[0] & y[i]) >> j & 1);
}
c[1] = (c[1] << 1) ^ aux;
}
cw[k]=65536*c[1] + c[0];
}
}