Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1997-10-20
1999-06-08
Ghebretinsae, Temesghen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
371 434, H04L 512, H03M 1312
Patent
active
059109670
ABSTRACT:
A communication system (11) uses concatenated coding in which an inner code is configured to match the needs of an outer code. The inner code is implemented through a pragmatic trellis coded modulation encoder (18) and decoder (34). A parser (50) of the encoder (18) distributes fewer than one user information bit per unit interval (66) to a convolutional encoder (58) which generates at least two convolutionally encoded bits for each user information bit it processes. Exactly one of the convolutionally encoded bits is phase mapped (56) with at least two user information bits during each unit interval (66). The decoder (34) detects a frame sync pattern (48) inserted into the user information bits to resolve phase ambiguities. Phase estimates are convolutionally decoded (100) to provide decoded data estimates that are then used to selectively rotate the phase estimates prior to routing the phase estimates to a slice detector (118).
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Ghebretinsae Temesghen
Gresham Lowell W.
Meschkow Jordan M.
SiCOM, Inc.
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