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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6414 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
29 lines
698 B
C
29 lines
698 B
C
void golay24_table_(int cw[])
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{
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// Compute arnd return the table of 4096 codewords for the Golay (24,12) code.
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// Array y contains the twelve rows (columns) of the parity-check matrix
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int y[12] = { 0x7ff, 0xee2, 0xdc5, 0xb8b, 0xf16, 0xe2d,
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0xc5b, 0x8b7, 0x96e, 0xadc, 0xdb8, 0xb71 };
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int c[2]; /* Codeword composed of 12-bit info and 12-bit parity */
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int i,j,k;
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int aux;
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int weight(int vector);
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for(k=0; k<4096; k++) {
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c[0] = k;
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c[1] = 0;
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for (i=0; i<12; i++) {
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aux = 0;
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for (j=0; j<12; j++) {
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aux = aux ^ ((c[0] & y[i]) >> j & 1);
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}
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c[1] = (c[1] << 1) ^ aux;
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}
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cw[k]=4096*c[0] + c[1];
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}
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}
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