A decoder including first and second decoding stages for selecting a codeword near to a given N-tuple r which is a sequence of N real values r.sub.i representing signals. The first stage includes substages associated respectively with sections r.sub.j of N-tuple r, each substage for evaluating distances...http://www.google.es/patents/US4933956?utm_source=gb-gplus-sharePatente US4933956 - Simplified decoding of lattices and codes
