1986-09-25
1988-07-05
Atkinson, Charles E.
Excavating
371 43, 375 27, 375 39, H04L 512, G06F 1110
Patent
active
047559985
ABSTRACT:
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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Wilson et al., Four-Dimensional Modulation and Coding: An Alternative to Frequency-Reuse, Report No. UVA/528200/EE83/107, Sep. 1983.
Fang & Lee, Four-Dimensionally Coded PSK System for Combatting Effects of Severe ISI and CCI, IEEE, 1983, pp. 1032-1038.
Atkinson Charles E.
Codex Corporation
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