A system and method for encoding information is disclosed. In one embodiment, information is encoded using a high protection code for the least significant bit and a low protection code for the next three most significant bits. The remaining bits are uncoded. The high protection code may be a turbo code...http://www.google.com.hk/patents/US7613985?utm_source=gb-gplus-share專利 US7613985 - Hierarchical trellis coded modulation
