Excavating
Patent
1992-04-16
1993-11-02
Canney, Vincent P.
Excavating
371 371, G06F 1110
Patent
active
052589870
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 (RS) 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 RS 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
Canney Vincent P.
deBlasi Gerard A.
Slusky Ronald D.
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