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Partial response channel signaling systems

  • US 5,040,191 A
  • Filed: 07/10/1990
  • Issued: 08/13/1991
  • Est. Priority Date: 02/24/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for generating a sequence of digital signals xk and/or a sequence of digital signals yk, k=1, 2, . . . , such that the sequence of yk signals is a partial-response-coded sequence derived from the sequence of xk signals, said signals yk being a sequence in a given modulation code, said apparatus comprisinga coset selector for generating coset representatives ck in accordance with said given modulation code;

  • andan encoder for selecting J said signals yk, J≧

    1, (yk, yk+1, . . . , yk+J-1) to be congruent to a sequence of J coset representatives ck (modulo Λ

    N), Λ

    N being an N-dimensional lattice, N being a positive integer, each of said J signals being chosen from a corresponding one of a plurality of J-dimensional constellations, said choice being based on a previous xk'"'"', k'"'"'<

    k, at least one of said plurality of J-dimensional constellations comprising both a point with a positive sum of coordinates and another point with a negative sum of coordinates, said encoder being arranged so that said signals xk have finite variance Sx.

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