Patent ID: 6118826
Filing Date: 2000-09-12
Classification: H03M

Abstract:
An apparatus for encoding Quadrature Amplitude Modulation (QAM) trellis coded data comprising:encoding means for receiving a subset of bits of an input data bits set and encoding said subset of bits according to a punctured convolutional encoding format based upon a lower rate convolutional code to provide a plurality of coded symbols;QAM modulation means for providing a modulation signal in accordance with remaining uncoded input bits of said input data bits set and said coded symbols, said remaining uncoded input bits corresponding to a group of modulation signal values;mapping means for receiving said remaining bits and said coded symbols and converting said remaining bits and said coded symbols to signal space coordinates according to a predetermined conversion format;wherein said mapping means is further for converting said remaining bits and said coded symbols to signal space coordinates in accordance with a mapping which is a combination of Gray code mapping and signal space blocking.