Method and apparatus for multilevel encoding for a local area ne

Details Method and apparatus for multilevel encoding for a local area ne Method and apparatus for multilevel encoding for a local area ne

1991-10-10

1994-01-18

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

341 56, 341 68, 341 76, 360 40, H04L 2549

Patent

active

052805000

ABSTRACT:
A multilevel encoding scheme for transmitted data that encodes data in a multilevel code wherein the amplitude of any transition is always exactly one level during any time interval. A single-level transition between any two adjacent levels during a time interval represents a logical "1"; no transition during a time interval represents a logical "0". In a specific embodiment, modulation is limited to three defined amplitude levels equally space in amplitude and encoding is according to a three-level code. A four-bit to five-bit encoding scheme may be used to distribute bits for minimizing d.c. offset. The input data is preferably further scrambled to minimize aberrations in the emissions spectrum of signal carried over unshielded media.

REFERENCES:
patent: 3919476 (1975-11-01), Torpie
patent: 4086587 (1978-04-01), Lender
patent: 4211929 (1980-07-01), Tamburelli
patent: 4618941 (1986-10-01), Linder et al.
patent: 4916689 (1990-04-01), Bielinski

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