mirror of https://github.com/saitohirga/WSJT-X.git
29 lines
698 B
C
29 lines
698 B
C
void golay24_table_(int cw[])
|
|
{
|
|
// Compute arnd return the table of 4096 codewords for the Golay (24,12) code.
|
|
|
|
// Array y contains the twelve rows (columns) of the parity-check matrix
|
|
int y[12] = { 0x7ff, 0xee2, 0xdc5, 0xb8b, 0xf16, 0xe2d,
|
|
0xc5b, 0x8b7, 0x96e, 0xadc, 0xdb8, 0xb71 };
|
|
|
|
int c[2]; /* Codeword composed of 12-bit info and 12-bit parity */
|
|
|
|
|
|
int i,j,k;
|
|
int aux;
|
|
int weight(int vector);
|
|
|
|
for(k=0; k<4096; k++) {
|
|
c[0] = k;
|
|
c[1] = 0;
|
|
for (i=0; i<12; i++) {
|
|
aux = 0;
|
|
for (j=0; j<12; j++) {
|
|
aux = aux ^ ((c[0] & y[i]) >> j & 1);
|
|
}
|
|
c[1] = (c[1] << 1) ^ aux;
|
|
}
|
|
cw[k]=4096*c[0] + c[1];
|
|
}
|
|
}
|