Wherein a block of parity bits is computed only from combined information

Official title: {wherein a block of parity bits is computed only from combined information bits or only from parity bits, e.g. a second block of parity bits is computed from a first block of parity bits obtained by systematic encoding of a block of information bits, or a block of parity bits is obtained by an XOR combination of sub-blocks of information bits}

H03M13/2942 (Wherein a block of parity bits is computed only from combined information) appears on 136 US grants and 132 published applications in this corpus.