Partial response channel signaling systems

Details Partial response channel signaling systems Partial response channel signaling systems

H - Electricity

03

M

354/67

H03M 7/00 (2006.01) H04L 25/497 (2006.01) H04L 27/34 (2006.01)

Patent

CA 1306543

Partial Response Channel Signaling Systems Abstract of the Disclosure Apparatus for generating a (running digital sum) sequence of digital signals XX and/or a (partial response coded) sequence of digital signals yk, k = 1, 2, ..., such that Yk = XK + xK-L, L an integer, in which the yk signals are a sequence in a given modulation code, In one aspect, the signals Yk are chosen to be congruent to coset representatives specified in accordance with a modulation code, a plurality of code constellations are used, and at least one constellation includes both a point with a positive sum of coordinates and one with a negative sum of coordinates. In another aspect, the signals xk are chosen to be congruent to a sequence of alternate (precoded) coset representatives. In other aspects, the Yk alphabet signals are evenly spaced, and a selectable, e.g., an optimal, tradeoff between Sx and Sy is made. An N-dimensional modulation code is generated as a sequence of one-dimensional signals. A maximum likelihood sequence estimation decoder reconstructs the estimated running digital sum, and generates a signal whenever the estimated running digital sum is outside a permissible range. In another aspect, the decoder includes a modified maximum likelihood sequence estimator adapted to find MQ partial decoded sequences, where Q is the number of encoder states, and M is an integer.

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