H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/00 (2006.01) H04L 27/18 (2006.01) H04L 27/34 (2006.01)
Patent
CA 2118991
A rotationally invariant, multilevel coded modulation scheme is provided by partitioning a constellation, such as an M-PSK or QAM constellation, into several trellis subsets, each of which is is further partitioned into block subsets. The input bits are then encoded to select a signal point from the constellation. A first portion of the input bits are differentially encoded. A second portion of the input bits, together with at least one of the differentially encoded bits, are trellis encoded to select a trellis subset of the constellation. A third portion of the input bits -- excluding any differentially encoded bits -- are block encoded to select a block subset from the selected trellis subset. A fourth portion of the input bits, together with the remaining differentially encoded bits, are used to select a signal point from the selected block subset.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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