Pulse or digital communications – Repeaters – Testing
Patent
1992-04-16
1994-07-12
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 39, 375 94, 371 377, 371 374, 371 43, H04L 2534, H04L 2549
Patent
active
053295510
ABSTRACT:
A multilevel coded modulation scheme trellis encodes a portion of the input data and the resulting encoded stream is used to identify a particular one of a predetermined number of subsets of symbols of a predetermined signal constellation. The remaining input data is coded using a Reed-Solomon (RV) code whose output is used to select for transmission a particular symbol from the identified subset. In applications in which phase hits or other channel phenomena may cause the received signal points to be phase-rotated versions of the signal points that were transmitted, differential encoding is included in the overall coded modulation scheme. In different embodiments, the differential encoding/decoding and RV encoding/decoding are in different orders. In one such embodiment, overlapped multilevel codes are used to preserve the advantages afforded by taking a multilevel coding approach.
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AT&T Bell Laboratories
Chin Stephen
Slusky Ronald D.
Vo Don N.
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