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Abstract

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 format a set of input user data bits to provide a set of symbols; a precoder for encoding according to a second encoding format a first symbol of the set symbols to provide a second symbol; an output encoder for encoding the second symbol according to a third encoding format to provide a third symbol wherein the third encoding format has an inverse transfer function relationship with the second encoding format, encoding the second symbol according to a fourth encoding format to provide a fourth symbol; and wherein remaining symbols of the set of symbols and the third and fourth symbols collectively represent phase point data. A decoder provides from received phase point data indicative of the trellis coded user data corresponding corrected estimates of the user data.

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