H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/50
H04L 27/02 (2006.01) H03M 13/25 (2006.01) H04L 27/34 (2006.01)
Patent
CA 1217530
ABSTRACT OF THE DISCLOSURE The invention relates to modulation systems for sending digital data over a band-limited channel in accordance with a code word corresponding to a plurality of modulation signal points drawn from a constellation of available signals. The constellation comprises groups having equal numbers of signals. The code word is selected from an available set of code words on the basis of a block of digital data, the code words belonging to the available set for the block being independent of the signal points cores- pounding to the code word selected for any other block. The system comprises an encoder for selecting said code word, the encoder being arranged so that the group from which at least one signal point for the block is drawn depends on the group from which at least one other signal point for the block is drawn. The system also comprises a modulator for sending the signal points over the channel. The signal points are two-dimensional, and the code words are 2m-dimensional, m being the number of signal points corresponding to each code word.
451966
Codex Corporation
Smart & Biggar
LandOfFree
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