Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1999-04-16
2000-05-09
Ghebretinsae, Temesghen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375280, 375262, 714792, H04L 512
Patent
active
060614080
ABSTRACT:
A method and apparatus for 45.degree. phase ambiguity resolution for one coded bit per symbol 8PSK modulation resolves phase ambiguity by selection of pre-differential encoders. A trellis encoder for 8PSK modulation of the type in which input data bits are encoded to a three-bit symbols includes a differential encoder, a convolutional encoder and first and second encoding assemblies. A decoder for decoding trellis coded data of 8PSK modulation includes a Viterbi decoder, a differential decoder, a convolutional decoder and first and second decoder assemblies. Each of the encoding and decoding assemblies includes multiplexing logic for selecting from among possible data paths according to a phase invariant scheme.
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Ghebretinsae Temesghen
Tiernan Communications, Inc.
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