Trellis coded modulation system employing a flexible trellis coded modulation decoder
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United States of America Patent
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Feb 10, 2004
Grant Date -
N/A
app pub date -
Oct 20, 2000
filing date -
Oct 20, 2000
priority date (Note) -
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Abstract
A trellis coded modulation system for use with a plurality of QAM modes that allows a choice of modulation scheme tailored to a communication channel. The system comprises an encoder and a decoder. The decoder uses input and output look-up tables that allow the use of a single decoder/encoder arrangement comprising a Viterbi decoder and a convolutional encoder to map trellis coded modulation to/from multiple modulation constellations. The size of the look-up tables used in the decoder is minimized because recognizable sequences (6 bits) are passed to the Viterbi decoder. The input look-up table provides minimal information about which region the symbol was found. The output look-up table processes the resulting information appropriately.
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