Matched spectral null codes with partitioned systolic trellis st

Details Matched spectral null codes with partitioned systolic trellis st Matched spectral null codes with partitioned systolic trellis st

1994-08-12

1996-07-16

Baker, Stephen M.

Excavating

H03M 1312

Patent

active

055374247

ABSTRACT:
Apparatus and method for transmitting spectral null sequences of a spectrally-constrained code over a partial response channel. A Viterbi detector receives the sequences from the channel and has a time-varying detector trellis structure derived from a running-digital-sum (RDS) trellis structure that requires each one of a set of quasicatastrophic sequences to be generated only from a trellis state corresponding to a respective preselected unique RDS value.

REFERENCES:
patent: 4620311 (1986-10-01), Schouhamer Immink
patent: 4888779 (1989-12-01), Karabed et al.
patent: 5257272 (1993-10-01), Fredrickson
patent: 5280489 (1994-01-01), Fredrickson et al.
patent: 5327440 (1994-07-01), Fredrickson et al.
Commonly assigned U.S. application Ser. No. 08/174,904, filed Dec. 24, 1993.
Commonly assigned U.S. application Ser. No. 08/242,942, filed May 15, 1994.

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