Method and means for generating and detecting spectrally constra

Details Method and means for generating and detecting spectrally constra Method and means for generating and detecting spectrally constra

1994-09-29

1996-08-20

Envall, Jr., Roy N.

Excavating

375254, 375265, 375290, G06F 1110, H03M 1312

Patent

active

055486002

ABSTRACT:
A method and means for detecting spectral null sequences of a spectrally-constrained code at the output of a noisy communications channel by tracking the spectral content of said sequences with a Viterbi detector using an N stage trellis and mapping each spectral null sequence to a unique path of acyclic successive states and edges through said trellis by selectively outsplitting counterpart states at preselected times modulo N in said trellis such that no pair of unique paths support the same spectral null sequence.

REFERENCES:
patent: 4888779 (1989-12-01), Karabed et al.
patent: 5095484 (1992-03-01), Karabed et al.
patent: 5208834 (1993-05-01), Fredrickson
patent: 5214672 (1993-05-01), Eyuboglu et al.
patent: 5257272 (1993-10-01), Fredrickson
patent: 5280489 (1994-01-01), Fredrickson et al.
patent: 5331320 (1994-07-01), Cideciyan et al.
"High-Speed Parallel viterbi Decoding: Algorithm and VLSI-Architecture" IEEE Communications Magazine, May 1991 pp. 46-55.

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