Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1996-11-15
1998-09-22
Vo, Don N.
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375264, 375265, 375286, 375298, 375341, 371 3701, 371 432, 371 433, 371 438, H03M 1300
Patent
active
058126015
ABSTRACT:
Source symbols are encoded for use in a higher level modulator by partitioning the source symbols into a number of classes. This principle is applied in a number of alternative transmitter and receiver embodiments. In one embodiment, a corresponding encoder is provided for each of the classes, and for each class, each of the source symbols is supplied to the corresponding encoder. For each encoder, coded symbols are supplied at an encoder output and the coded symbols are partitioned into a number of levels associated with the corresponding class, wherein at least one of the classes has at least two levels assigned to it. The partitioned coded symbols are then supplied to a mapper that generates amplitude coefficient signals. Corresponding receivers perform inverse operations to those performed by the transmitters.
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Le Amanda T.
Telefonaktiebolaget LM Ericsson
Vo Don N.
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