Pulse or digital communications – Repeaters – Testing
Patent
1983-04-14
1986-06-24
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 42, 375 67, 332 9R, 371 37, H04B 1402, H04L 2720
Patent
active
045970904
ABSTRACT:
An improvement to a modulation system of the kind in which the encoder selects a codeword corresponding to a plurality of modulation signal points on the basis of a block of digital data, the available codewords for a given block being independent of the signal points corresponding to the codeword selected for any other block. In the improvement a constellation of available signals comprises groups with equal numbers of signals, and an encoder is arranged so that the group from which at least one signal point for a block is drawn depends on the group from which at least one other signal point for the block is drawn. In another aspect, the constellation includes inner signals and outer signals, one bit of data determines whether any of the signal points will be outer signals, and if so at least one other bit determines which will be an outer signal point.
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Codex Corporation
Safourek Benedict V.
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