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This document discusses trellis-coded modulation techniques. It provides two examples of partitioning constellations for 8-PSK and 16-QAM modulation schemes to increase minimum distance between signal points. The document then describes Ungerboeck codes, a class of trellis codes that use convolutional encoding and signal point partitioning. Examples of Ungerboeck codes for 8-PSK modulation are shown, including the trellis diagrams and encoder states. Asymptotic coding gain of Ungerboeck codes is defined bas

Author

matilda

Language

EN