Coded modulation system

Details Coded modulation system Coded modulation system

H - Electricity

04

L

354/67

H04L 1/00 (2006.01) H03M 13/00 (2006.01) H03M 13/25 (2006.01) H04L 27/34 (2006.01)

Patent

CA 1239479

Coded Modulation System Abstract of the Disclosure In a modulation system for sending digital symbols over a band-limited channel in accordance with a sequence of multi-dimensional points each composed of a plurality of two-dimensional modulation signal points, and each selected from an available alphabet of the multi-dimensional points by an encoder on the basis of a group of the digital symbols, the improvement which includes circuitry for accumulating the symbols of each group, and circuitry for thereafter selecting the multi-dimensional point for the group, and in which the available alphabet includes a plurality of subsets of the multi-dimensional points, and the subset from which the multi-dimensional point is selected for each group depends on the subset from which the multi-dimensional point is selected for another one of the groups.

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