Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1996-11-25
1999-09-14
Chan, Jason
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
371 434, H04L 2302, H04L 512
Patent
active
059533765
ABSTRACT:
Signal points from a PCM-derived constellation are selected for transmission via a modulation technique which employs different levels of redundancy coding--including the possibility of no redundancy coding--for respective different sub-constellations of the overall PCM-derived constellation. The coding that is employed for at least one of the sub-constellations is carried out independently from any coding that is employed for any of the other sub-constellations. In preferred embodiments, the sub-constellations are non-overlapping portions of the overall PCM-derived constellation, the redundancy codes are trellis codes, and the trellis codes employed in conjunction with sub-constellations having increasingly smaller minimum distance between signal points provide respectively increasing amounts of decibel gain in that minimum distance in order to compensate for that increasingly smaller minimum distance.
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Chan Jason
Corrielus Jean B
Lucent Technologies - Inc.
Slusky Ronald D.
Weinick Jeffrey M.
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