A method and apparatus for trellis coding of input data as phase point data for M-ary modulation and transmission upon a communication channel and a method and apparatus for decoding same. The trellis encoding is accomplished by an input encoder for receiving and encoding according to a first encoding...http://www.google.com/patents/US5428631?utm_source=gb-gplus-sharePatent US5428631 - Method and apparatus for resolving phase ambiguities in trellis coded modulated data
